Charcot-Marie-Tooth Neuropathy Type 1B (CMT1B)

Charcot-Marie-Tooth neuropathy type 1B (CMT1B) is a rare, inherited nerve disease that mainly affects the peripheral nerves in the arms and legs. These nerves normally carry signals for movement and feeling between the spinal cord and the limbs. In CMT1B, there is a change (mutation) in a gene called MPZ, which tells the body how to make a protein called myelin protein zero. This protein is a key building block of myelin, the insulating “coat” around nerves. When myelin is damaged or formed in the wrong way, nerve signals travel slowly and become weak, leading over time to muscle weakness, muscle wasting, foot deformities, and loss of feeling in the hands and feet.Orpha.net+2Genetic Diseases Info Center+2

Charcot-Marie-Tooth neuropathy type 1B (CMT1B) is a genetic, slowly progressive nerve disease that mainly affects the peripheral nerves in the legs, feet, hands, and sometimes arms. It is usually caused by harmful changes (mutations) in the MPZ (myelin protein zero) gene, which is important for building and maintaining the myelin coating around nerves. When myelin is weak or damaged, nerve signals become slow and “noisy”, leading to weakness, wasting of muscles, foot deformities, balance problems, numbness, and sometimes neuropathic pain. There is no cure yet, but many supportive treatments can improve walking, function, independence, and quality of life.Orpha.net+1

CMT1B belongs to the CMT1 group, which is the “demyelinating” type of Charcot-Marie-Tooth disease. “Demyelinating” means that the main problem is damage to the myelin sheath, not the core of the nerve fiber itself. This damage causes nerve conduction velocities (speed of electrical signals) to be slower than normal on nerve conduction tests. People with CMT1B may have symptoms from early childhood to adulthood, and the severity can range from very mild to very disabling, even within the same family.Charcot-Marie-Tooth Association+2Muscular Dystrophy Association+2

Other Names for Charcot-Marie-Tooth Neuropathy Type 1B

Charcot-Marie-Tooth neuropathy type 1B is known by several other names. These names are often used in medical reports, research papers, or genetic test results:

1. CMT1B

2. Charcot-Marie-Tooth disease type 1B

3. Hereditary motor and sensory neuropathy type 1B (HMSN1B)

4. MPZ-related CMT (because the MPZ gene is involved)

5. MPZ-related demyelinating neuropathy

6. Myelin protein zero–related hereditary neuropathy

7. Autosomal dominant demyelinating Charcot-Marie-Tooth neuropathy due to MPZ mutation

All these terms describe the same basic condition: a dominantly inherited, demyelinating peripheral neuropathy caused by a harmful variant in the MPZ gene.Orpha.net+2PNAS+2

Types of Charcot-Marie-Tooth Neuropathy Type 1B

Doctors sometimes talk about “types” or “phenotypes” of CMT1B based on age at onset and severity, not because the disease is different, but because the symptoms can appear and progress in different ways. The following list shows common clinical phenotypes seen with CMT1B:

1. Infantile-onset severe CMT1B – symptoms start in the first years of life, with very delayed walking, very weak legs, and often severe foot deformities.

2. Early-childhood-onset CMT1B – children walk, but develop clumsiness, frequent falls, and high-arched feet in early school years.

3. Classic childhood-onset CMT1B – symptoms start in later childhood with typical distal weakness, foot drop, and slowly progressive difficulty with running and sports.Orpha.net+1

4. Adolescent-onset CMT1B – teens notice weakness, foot deformities, and sensory loss that were not obvious earlier.

5. Adult-onset mild CMT1B – some people only notice symptoms in their 20s, 30s, or later, often mild weakness, cramps, or numbness.malacards.org+1

6. CMT1B with Dejerine-Sottas–like picture – an especially early and severe form with very slow nerve conduction and marked disability in childhood.

7. CMT1B with hearing loss – some MPZ variants are linked with both neuropathy and sensorineural hearing loss.

8. CMT1B with pupillary or cranial nerve involvement – rare variants can affect eye movements or pupil responses.CMT Research Foundation+1

These are not separate diseases, but different ways that the same MPZ-related neuropathy can appear, depending on the exact mutation and other genetic and environmental factors.

Causes of Charcot-Marie-Tooth Neuropathy Type 1B

The single fundamental cause of CMT1B is a harmful mutation in the MPZ gene, which makes the myelin protein zero used in peripheral nerve myelin. All the “causes” listed below describe different ways in which this gene or the myelin it produces can be disturbed, or factors that can modify how severe the disease appears.PNAS+2Wiley Online Library+2

1. Autosomal dominant MPZ gene mutation
   In most people with CMT1B, the condition is inherited in an autosomal dominant way. This means one changed copy of the MPZ gene, inherited from one parent, is enough to cause disease. The faulty gene is present from birth, so the disease is not caused by lifestyle or infection.

2. De novo MPZ mutation (new mutation)
   Sometimes, a child with CMT1B is the first person in the family to have the disease. In these cases, a new mutation arises in the MPZ gene in the sperm, egg, or early embryo. The child can then pass this mutation on to their own children.

3. Missense mutation changing MPZ protein structure
   Many CMT1B cases are caused by “missense” mutations, where one DNA letter changes and leads to a different amino acid in the myelin protein zero. Even a small change can disrupt how the protein folds or sticks to other myelin proteins, making the myelin unstable and leading to demyelination.PMC+2ScienceDirect+2

4. Nonsense or frameshift mutations in MPZ
   Some mutations introduce a premature stop signal or shift the reading frame of the gene. This can produce a very short or non-functional protein. In these cases, the myelin sheath may be extremely thin or poorly formed, causing early and severe neuropathy.

5. Mutations affecting the extracellular domain of MPZ
   The part of the MPZ protein that lies outside the Schwann cell helps myelin layers to “stick” together. Mutations in this region can prevent proper myelin compaction, so the myelin sheath becomes fragile and prone to damage during normal nerve use.PNAS+1

6. Mutations affecting the cytoplasmic or intracellular domain
   Changes in the internal part of MPZ can disturb signaling between the myelin sheath and the Schwann cell. This can interfere with normal cell survival pathways and may trigger stress responses inside Schwann cells.

7. Endoplasmic reticulum stress from misfolded MPZ
   Some mutant MPZ proteins fold incorrectly and accumulate inside the Schwann cell’s endoplasmic reticulum. This triggers the unfolded protein response (UPR). When this stress system is constantly activated, Schwann cells become sick and may die, leading to chronic demyelination and nerve dysfunction.CMT Research Foundation+1

8. Loss-of-function MPZ variants
   Certain mutations reduce or remove the normal function of MPZ. With less effective myelin protein zero available, myelin sheaths may be thinner, less stable, or poorly formed. Some of these loss-of-function changes are linked with milder but still disabling forms of CMT1B.NCBI

9. Gain-of-toxic-function MPZ variants
   Other MPZ mutations may have a “toxic gain of function,” meaning the abnormal protein actively harms the Schwann cell or interacting proteins. This toxic effect can cause more severe nerve damage than simple loss of function.

10. Genetic modifiers in other myelin or axonal genes
    Variants in other genes related to myelin or nerve structure can modify how severe CMT1B becomes. For example, changes in genes that control myelin repair, energy use in nerve cells, or axon structure may worsen or soften the clinical picture.

11. Mitochondrial stress and energy failure in Schwann cells
    Chronic ER stress and abnormal myelin can harm mitochondria (the energy factories) in Schwann cells. When energy supply is poor, Schwann cells cannot maintain normal myelin, which makes nerve damage worse over time.

12. Secondary axonal degeneration
    Although CMT1B is mainly a myelin disease, damaged myelin eventually harms the underlying axon. Over years, this secondary axonal loss contributes to greater weakness, muscle wasting, and loss of reflexes.pfmjournal.org+1

13. Family history of MPZ-related neuropathy
    Having a parent with an MPZ mutation greatly increases the chance of inheriting CMT1B. Each child of an affected parent has about a 50% chance of inheriting the mutated gene.

14. Modifier effects of general health (e.g., diabetes)
    Health problems such as diabetes, vitamin deficiencies, or thyroid disease do not cause CMT1B, but they can further damage nerves and make the inherited neuropathy worse if they occur in the same person.

15. Physical overuse of weak muscles
    Heavy, repetitive strain on already weakened distal muscles does not cause CMT1B, but it can aggravate symptoms, increase fatigue, and speed up functional decline in some people.

16. Obesity and reduced physical activity
    Excess body weight and low activity do not cause the genetic neuropathy, but they increase stress on weak legs, make balance harder, and may worsen pain and disability.

17. Alcohol-related nerve damage in susceptible people
    Heavy alcohol use can cause acquired neuropathy. In someone with CMT1B, this extra damage can worsen numbness and weakness, although the genetic MPZ mutation is still the root cause.

18. Exposure to neurotoxic drugs
    Some chemotherapy drugs or other neurotoxic medicines can harm peripheral nerves. In a person with CMT1B, this can lead to more severe or earlier symptoms than would otherwise appear.

19. Inadequate orthotic and supportive care
    Lack of proper shoes, braces, and physical therapy does not cause CMT1B, but it allows deformities, falls, and joint damage to develop earlier, making the neuropathy more disabling.

20. Age-related progression
    CMT1B often gets slowly worse with age. Even without new injuries, ongoing demyelination and axonal loss over decades naturally lead to more noticeable weakness and sensory loss later in life.

Symptoms of Charcot-Marie-Tooth Neuropathy Type 1B

Symptoms of CMT1B are similar to other CMT1 types, but severity and age at onset can vary widely. They mainly affect the feet, lower legs, hands, and sometimes other areas.Muscular Dystrophy Association+2pfmjournal.org+2

1. Distal muscle weakness in the feet and lower legs
   One of the earliest and most common symptoms is weakness in the muscles that move the feet and ankles. People may notice difficulty running, jumping, or climbing stairs. Over time, lifting the front of the foot becomes harder, which can cause tripping.

2. Foot drop and high-stepping gait
   Because the muscles that lift the foot are weak, the toes may drag on the ground. To avoid tripping, people may lift their knees higher with each step, creating a “high-stepping” gait. This is often seen by parents or teachers in children with early CMT1B.

3. High-arched feet (pes cavus)
   The imbalance between weak and strong foot muscles often pulls the foot into a high arch. The toes may become clawed. These changes make shoe fitting difficult and increase the risk of calluses, pressure points, and ankle sprains.

4. Frequent ankle sprains and poor balance
   Weakness of the muscles around the ankle and loss of position sense (proprioception) make the ankle unstable. People may twist their ankles easily, fall on uneven ground, or have trouble walking in the dark.

5. Muscle wasting in the lower legs (“inverted champagne bottle” legs)
   With long-standing nerve damage, the calf muscles shrink, and the lower legs look thin compared with the thighs. This is sometimes described as “stork legs” or “inverted champagne bottle” appearance.

6. Numbness and reduced feeling in feet and toes
   CMT1B damages sensory fibers as well as motor fibers. People often notice tingling, “pins and needles,” or numbness in the toes and soles of the feet. Over time, they may not feel pain, heat, or injury in these areas.

7. Neuropathic pain or burning sensations
   Some people experience burning, shooting, or electric-like pain in the feet and sometimes in the hands. This “neuropathic pain” happens because damaged nerves send abnormal signals to the brain.

8. Weakness and wasting in the hands
   As the disease progresses, weakness can spread to the small muscles of the hands. This causes difficulty with fine tasks like buttoning clothes, writing, using a phone, or opening bottles.

9. Loss of reflexes (especially ankle reflex)
   On examination, doctors often find that ankle reflexes are reduced or absent. Knee reflexes may also be weak. This is a common sign of chronic peripheral neuropathy.

10. Cold, pale feet with color changes
    Poor nerve supply can affect blood flow and sweating. The feet may feel cold, look pale or bluish, and be more prone to skin changes or ulcers if not protected.

11. Cramps and muscle fatigue
    Weak and overworked muscles can cramp easily, especially after long walks or standing. People may feel that their legs tire faster than those of friends or family members of similar age.

12. Scoliosis or spinal curvature (in severe cases)
    In some severe early-onset forms, muscle imbalance can affect the spine, causing scoliosis (sideways curvature). This is more common in people who develop symptoms in infancy or early childhood.

13. Hand tremor or clumsiness
    Some people develop a fine tremor or shaky hands. Combined with weakness and sensory loss, this can make tasks that require steadiness and precision more difficult.

14. Hearing loss (in some MPZ variants)
    Certain MPZ mutations can affect hearing. People may notice difficulty following conversations, especially in noisy rooms, and may need hearing tests and possible hearing aids.

15. Emotional and social impact
    Living with chronic weakness, deformity, and pain can lead to frustration, low mood, or worry about the future. These emotional effects are real symptoms that deserve attention and support.

Diagnostic Tests for Charcot-Marie-Tooth Neuropathy Type 1B

Doctors use a combination of history, examination, electrodiagnostic studies, genetic tests, and sometimes imaging to diagnose CMT1B and to distinguish it from other types of neuropathy.Longdom+3Charcot-Marie-Tooth Association+3Louisiana Department of Health+3

Physical Exam Tests

1. General neurological examination
   The doctor first takes a careful history and performs a full neurological exam. They check muscle bulk, muscle strength, reflexes, and sensation in the arms and legs. In CMT1B, they often see thin lower-leg muscles, weakness in foot and hand muscles, reduced reflexes, and sensory loss in a “stocking and glove” pattern. This broad exam suggests a chronic, length-dependent neuropathy.

2. Gait and posture observation
   The doctor watches how the person stands and walks. They look for high-stepping gait, foot drop, ankle instability, and difficulty walking on heels or toes. They also look for scoliosis or other postural changes. These observations help show how the neuropathy affects daily movement and balance.

3. Foot and lower-limb inspection
   The feet and legs are examined carefully for high arches, flat feet, claw toes, calluses, pressure sores, and muscle wasting. In CMT1B, high arches and claw toes are common, and the calves may look thin. The doctor also checks for ankle contractures and joint stiffness that may need orthopedic attention.

4. Reflex testing (deep tendon reflexes)
   Using a reflex hammer, the doctor taps the knee and ankle tendons. In CMT1B, ankle reflexes are often absent and knee reflexes may be reduced. This pattern supports a diagnosis of peripheral neuropathy rather than a brain or spinal cord problem.

5. Functional assessment of activities of daily living
   The clinician may ask the person to perform simple tasks such as standing from a chair without using hands, climbing a step, buttoning a shirt, or writing. The ease or difficulty of these tasks helps to measure how much the neuropathy affects everyday function and helps guide rehabilitation plans.

Manual Tests (Bedside Maneuvers)

6. Romberg balance test
   For the Romberg test, the person stands with their feet together, first with eyes open and then with eyes closed. In CMT1B, loss of position sense in the feet can cause swaying or loss of balance when the eyes are closed. This test helps show sensory imbalance caused by neuropathy.

7. Heel-walk and toe-walk test
   The person is asked to walk on their heels and then on their toes. Heel walking tests the muscles that lift the foot, while toe walking tests the calf muscles. People with CMT1B often cannot heel-walk well because of weakness in ankle dorsiflexors, which is a hallmark of foot drop.

8. Vibration sense test with tuning fork
   A vibrating tuning fork is placed on bony points such as the toes or ankles. The person is asked to say when they feel the vibration start and stop. Reduced or absent vibration sense in the feet is common in CMT1B and indicates damage to large sensory fibers.

9. Pinprick and light-touch sensory testing
   The doctor gently touches the skin with cotton (for light touch) and a disposable pin (for sharp sensation). They compare both sides of the body and more proximal areas to distal ones. In CMT1B, sensation is often decreased in a stocking-like pattern in the feet and legs.

Lab and Pathological Tests

10. Genetic testing for MPZ mutations
    Genetic testing is the key test that confirms CMT1B. A blood sample is taken, DNA is extracted, and the MPZ gene is analyzed for harmful variants. When a pathogenic MPZ mutation is found in someone with a typical demyelinating neuropathy, the diagnosis of CMT1B is established.NCBI+1

11. Expanded hereditary neuropathy gene panels
    Sometimes, a broader gene panel is ordered that includes MPZ and many other CMT-related genes. This is useful when the specific subtype is unclear. In CMT1B, the panel will show an MPZ variant that matches the person’s symptoms and family pattern.

12. Routine blood tests to exclude acquired causes
    Blood tests such as fasting glucose, vitamin B12, thyroid function, kidney and liver function, and tests for autoimmune or infectious diseases may be done. These tests do not diagnose CMT1B, but they help rule out other neuropathy causes that can mimic or worsen inherited disease.

13. Nerve biopsy with myelin staining (rarely needed)
    In the past, doctors often performed nerve biopsy, taking a small piece of a sensory nerve (usually from the ankle) to look at under a microscope. In CMT1B, the biopsy may show thin or abnormal myelin and “onion bulb” formations from repeated demyelination and remyelination. Today, because genetic testing is available, nerve biopsy is usually reserved for unclear or research cases.

Electrodiagnostic Tests

14. Motor nerve conduction studies (NCS)
    In motor NCS, electrodes deliver small electrical pulses to a nerve and record the response in the muscles it controls. In CMT1B, conduction velocities in motor nerves are typically uniformly reduced (often <38 m/s), showing a demyelinating pattern, while distal latencies may be prolonged. This helps distinguish CMT1B from axonal CMT2 and from acquired neuropathies.Charcot-Marie-Tooth Association+2MSJ Online+2

15. Sensory nerve conduction studies
    Sensory NCS measure responses from purely sensory nerves. In CMT1B, sensory responses in the legs may be markedly reduced or absent, showing significant sensory involvement. Reduced sensory amplitudes coupled with slowed conduction velocities support a chronic demyelinating neuropathy.

16. Electromyography (EMG)
    EMG uses a fine needle electrode inserted into muscles to record electrical activity at rest and during contraction. In CMT1B, EMG often shows signs of chronic denervation and re-innervation, such as large motor units and reduced recruitment. EMG helps confirm that muscle weakness comes from nerve damage, not from primary muscle disease.

17. F-wave and late response studies
    F-waves and other late responses measure conduction through the entire length of the motor nerve, including the spinal roots. In demyelinating neuropathies like CMT1B, these responses may be delayed or absent. These tests provide additional support for a diffuse demyelinating process affecting many nerve segments.

Imaging Tests

18. Peripheral nerve ultrasound
    High-resolution ultrasound can visualize peripheral nerves in the arms and legs. In CMT1B, studies show nerve enlargement in some proximal segments, with different patterns compared with other CMT types such as CMT1A. Ultrasound is non-invasive and can help distinguish hereditary neuropathies from acquired ones in some cases.Wiley Online Library+1

19. Magnetic resonance imaging (MRI) of peripheral nerves or plexus
    MRI can show nerve root or plexus enlargement and can help rule out other conditions such as nerve tumors or inflammatory neuropathies. While MRI is not required to diagnose CMT1B, it can be helpful when the picture is unclear or when doctors suspect other causes of nerve damage alongside hereditary neuropathy.

20. X-rays of feet and spine
    Simple X-rays of the feet can show high arches, claw toes, and joint deformities, while spine X-rays can show scoliosis or other curvature. These images help orthopedic and rehabilitation teams plan bracing, shoe inserts, or surgery if needed, and they document structural changes caused by longstanding neuropathy.

Non-Pharmacological Treatments

1. Individualized physical therapy program
A specialist physiotherapist builds a gentle, long-term exercise plan to keep joints flexible and muscles as strong as possible without over-fatigue. For CMT1B, therapy usually focuses on ankle dorsiflexors, peroneal muscles, and hip stabilizers. Regular, supervised exercise helps maintain walking speed, reduce falls, and delay contractures. It does not cure the gene defect, but it slows secondary problems like stiffness and joint deformity.PMC+1

2. Balance and gait training
Because CMT1B damages sensory nerves that tell the brain where the feet are, many people develop an unsteady, high-steppage gait. Balance training uses simple tasks (standing on varied surfaces, tandem walking, step practice) to strengthen compensating muscles and train the brain to use vision more effectively. This reduces falls and builds confidence when walking on uneven ground or in the dark.PMC+1

3. Stretching to prevent contractures
Tight calf, hamstring and plantar fascia tissues pull the foot into a high arch and toe clawing. Daily, slow stretches (30–60 seconds, repeated) help keep muscle-tendon units long and prevent fixed deformity. Stretching does not fix muscle weakness, but it reduces pain, pressure points, and later need for aggressive surgery.PMC+1

4. Strength training of preserved muscles
In CMT1B, some muscles stay relatively strong for many years. Low-to-moderate resistance exercises (bands, light weights, sit-to-stand) can safely strengthen these spared muscles. The goal is to support weak areas and improve overall function, not to body-build. Over-heavy loads are avoided because overwork can worsen fatigue and possibly accelerate weakness in fragile nerves.PMC+1

5. Aerobic exercise (walking, cycling, swimming)
Regular low-impact aerobic activity improves heart health, stamina and mood. Studies in hereditary neuropathies show that safe aerobic training can improve walking distance and reduce fatigue. Swimming or stationary cycling are often preferred because they limit joint impact and allow people with foot drop to move safely and comfortably.ScienceDirect+1

6. Occupational therapy for hand and daily tasks
Occupational therapists help with fine motor problems such as buttoning, writing, cutlery use, and smartphone handling. They may suggest adapted pens, built-up handles, splints, and energy-saving techniques. The purpose is to protect independence in school, work, and self-care, and to prevent frustration and over-strain of small hand muscles.PMC+1

7. Hand splints and functional braces
Light splints can keep fingers or thumbs in better alignment, reduce joint strain, and support grip. Night splints may hold the wrist in a neutral position to lessen numbness and pain. They do not stop the disease but can delay deformity and make daily tasks less painful.PMC+1

8. Ankle-foot orthoses (AFOs)
AFOs are common in CMT: they support foot drop, control ankle instability, and help achieve a more normal heel-to-toe gait. Modern carbon or plastic AFOs are lighter and more comfortable than older designs. Studies show they can improve walking speed, safety and endurance in CMT.PubMed+1

9. Custom footwear and in-shoe orthotics
Custom shoes, insoles, and rocker-bottom soles redistribute pressure from high arches, clawed toes and bony prominences. They reduce painful calluses and prevent ulcers. For many people with CMT1B, properly fitted shoes plus AFOs delay or even avoid the need for major reconstructive surgery.PMC+1

10. Walking aids (cane, crutches, walker)
If balance and strength are poor, using a cane or walker can dramatically reduce falls and energy cost. Therapists teach correct height and side for the device. This is not a sign of “giving up”; it is a safety tool that protects joints and allows longer distances with less fatigue.PMC+1

11. Aquatic therapy / hydrotherapy
Warm-water therapy uses buoyancy to unload joints while still challenging muscles and balance. People with CMT can practice walking, stepping, and gentle resistance work in water with less risk of falls. Water also helps relax tight muscles and may lower pain.ScienceDirect+1

12. Pain psychology and cognitive-behavioural therapy (CBT)
Chronic neuropathic pain and disability often cause anxiety, low mood, and sleep problems. CBT and related therapies teach pacing, relaxation, coping thoughts, and problem-solving. This does not say “the pain is in your head”; it gives the brain new tools to dampen pain signals and reduce suffering.PMC+1

13. Fatigue management and energy conservation
CMT1B often brings heavy tiredness because weak muscles work harder. Occupational therapists teach pacing, planned rests, sitting for tasks, smart sequencing of chores, and using assistive devices. This protects limited “energy budget” so people can spend more strength on what truly matters, like work or study.PMC+1

14. Home safety modifications
Simple changes—grab bars, non-slip mats, good lighting, removing loose rugs, railings on stairs—reduce falls dramatically. In CMT, even a small trip can cause fractures or ankle sprains because ankles are unstable, so environment safety is as important as muscle strength.PMC+1

15. Vocational and educational support
Career counsellors and occupational health teams can help choose jobs or study paths that match physical abilities, suggest ergonomic adjustments, and arrange accommodations (like extra time, remote work, or adapted tools). This keeps people with CMT1B active in school and employment, which greatly supports mental health.PMC+1

16. Genetic counselling
Because CMT1B is usually inherited in an autosomal-dominant way, a 50% chance of passing the mutation can exist for each child. Genetic counsellors explain inheritance, test options, and reproductive choices in clear language. This helps families make informed, non-rushed decisions.Orpha.net+1

17. Psychological support and peer groups
Living with a visible, progressive disability can lead to social anxiety, sadness, or isolation. Talking with psychologists, social workers, or patient groups (for example, CMT advocacy foundations) can reduce loneliness and share practical tips. Meeting others with CMT often replaces fear with realistic hope.PMC+1

18. Lifestyle optimisation (sleep, stress, smoking, alcohol)
Good sleep, stress-management, and avoiding smoking or heavy alcohol use support nerve and heart health. Alcohol and tobacco can worsen neuropathy and increase pain. A calm, regular routine with relaxation practices (breathing, mindfulness, light yoga) helps the nervous system stay more stable.nhs.uk+1

19. Weight management and general fitness
Extra body weight increases load on weak ankles and feet and makes walking and transfers harder. A diet rich in vegetables, fruits, whole grains, lean protein, and healthy fats—similar to a Mediterranean-style pattern—supports nerve health and makes physical therapy easier.The Foundation for Peripheral Neuropathy+1

20. Avoidance of neurotoxic medications
Some chemotherapy drugs (like vincristine) and certain high-dose vitamin B6 supplements can damage peripheral nerves. People with known CMT1B should remind every doctor and dentist they see about their neuropathy so care teams can avoid or carefully monitor potentially neurotoxic medicines whenever possible.FDA Access Data+1

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Drug Treatments

Important safety note: these medicines are for doctors to prescribe and adjust. A teenager or adult should never start, stop, or change any of these drugs without a neurologist. They mainly treat neuropathic pain, musculoskeletal pain, mood, and sleep; none of them cures the gene defect in CMT1B.

1. Pregabalin (Lyrica)
Pregabalin is an anti-seizure medicine that calms overactive pain nerves by binding to α2δ subunits of voltage-gated calcium channels. It is FDA-approved for several neuropathic pain conditions with typical adult doses 150–300 mg/day, divided, and sometimes up to 450–600 mg/day. Common side effects include dizziness, sleepiness, weight gain and swelling.FDA Access Data+1

2. Gabapentin (Neurontin and generics)
Gabapentin is also an anticonvulsant that dampens abnormal nerve firing through similar calcium-channel binding. Trials support use in neuropathic pain at doses titrated up to 1,800–3,600 mg/day in three divided doses, depending on kidney function and tolerance. Side effects often include dizziness, fatigue, and sometimes swelling or weight gain.FDA Access Data+1

3. Duloxetine (Cymbalta)
Duloxetine is a serotonin-noradrenaline reuptake inhibitor (SNRI) approved for diabetic neuropathic pain, fibromyalgia, and depression. It increases natural pain-modulating chemicals in the spinal cord and brain. Typical neuropathic pain doses are 60–120 mg/day. Nausea, dry mouth, sweating, and mild blood pressure changes are common early adverse effects.FDA Access Data+1

4. Amitriptyline (Elavil and generics)
Amitriptyline is a tricyclic antidepressant used at low doses (often 10–75 mg at night) for neuropathic pain and sleep problems. It blocks reuptake of serotonin and noradrenaline and also has antihistamine effects, which can cause drowsiness. Dry mouth, constipation, weight gain, and sometimes heart rhythm changes mean careful dose titration and monitoring are needed.FDA Access Data+1

5. Nortriptyline
Nortriptyline is a “lighter” tricyclic with fewer sedative and anticholinergic effects than amitriptyline, but a similar pain-relieving mechanism. Doses usually start around 10–25 mg at night and slowly increase. It can improve both neuropathic pain and mood, but may cause dry mouth, constipation, or heart rhythm changes at higher doses.FDA Access Data+1

6. Venlafaxine extended-release (Effexor XR)
Venlafaxine is another SNRI that can help neuropathic pain by boosting serotonin and noradrenaline. Doses in pain studies are often 75–225 mg/day. It can help when depression and anxiety co-exist with pain. Side effects may include nausea, sweating, mild blood pressure increase, and insomnia in some patients.Charcot-Marie-Tooth Association+1

7. Tramadol
Tramadol is a weaker opioid that also has SNRI-like actions. It may be used short-term for severe pain flares when first-line neuropathic drugs are not enough. Doses are commonly 50–100 mg every 6–8 hours (maximum daily doses must respect local guidelines). It can cause dizziness, nausea, constipation, and, rarely, dependence or seizures—so it is used carefully.ScienceDirect+1

8. Tapentadol
Tapentadol combines opioid activity with noradrenaline reuptake inhibition and is licensed for some severe chronic pains. It may be considered in selected adults with very severe neuropathic pain who do not respond to other options, under specialist care. Side effects include nausea, constipation, dizziness and risk of dependence; careful monitoring is essential.ScienceDirect+1

9. Topical lidocaine 5% patch
Lidocaine patches numb painful skin areas by blocking sodium channels in nerve endings. They are FDA-approved for post-herpetic neuralgia but commonly used off-label for focal neuropathic pain. Patches are usually applied up to 12 hours on, 12 hours off over the most painful area. Local skin irritation is the most common side effect.PMC+1

10. Topical capsaicin 8% patch (Qutenza)
High-concentration capsaicin temporarily “defunctionalizes” overactive pain fibres by depleting substance P and affecting TRPV1 receptors. A single in-clinic application can reduce pain for weeks in some neuropathies. Strong burning during and shortly after application is common, so patches are applied under medical supervision with local anaesthetic.FDA Access Data+1

11. Non-steroidal anti-inflammatory drugs (NSAIDs – ibuprofen, naproxen)
NSAIDs do not treat nerve pain directly, but they help with musculoskeletal pain from deformities, tendon strain, and arthritis in overloaded joints. Typical doses use the lowest effective amount for the shortest time (for example, ibuprofen 200–400 mg every 6–8 hours as needed in adults). They can irritate the stomach or kidneys, so long-term use needs medical review.Texas Pain Experts+1

12. Baclofen
Baclofen is a muscle relaxant that reduces spasticity by stimulating GABA-B receptors in the spinal cord. In CMT1B, it may be used if there is painful muscle stiffness or cramps, although spasticity is less prominent than in brain or spinal cord diseases. Doses increase slowly to avoid drowsiness, weakness and dizziness.Charcot-Marie-Tooth Association+1

13. Tizanidine
Tizanidine is another antispastic drug that acts on α2-adrenergic receptors. Low doses, usually at night, may reduce painful muscle tone or cramps. Side effects include sleepiness, dry mouth and drops in blood pressure, so careful titration and liver-function monitoring are required.Charcot-Marie-Tooth Association+1

14. Low-dose benzodiazepines (e.g., clonazepam) – selected cases only
In rare, severe cases with neuropathic pain plus anxiety or severe nocturnal cramps, a neurologist may prescribe a very low dose of clonazepam for short periods. It calms overactive nerve circuits but carries risks of dependence, drowsiness and falls, especially in older adults, so it is not a first-line medicine and must be monitored closely.Charcot-Marie-Tooth Association+1

15. SSRIs or SNRIs for mood and pain modulation
Beyond duloxetine and venlafaxine, other antidepressants like sertraline or escitalopram may be chosen mainly for depression and anxiety related to chronic disease. Improving mood and sleep often lowers pain intensity by changing how the brain processes pain signals, even if these drugs are not classic neuropathic pain agents.Charcot-Marie-Tooth Association+1

16. Melatonin or sedating antidepressants for sleep
Good sleep is essential for pain control. Doctors sometimes use melatonin or low-dose sedating antidepressants like trazodone to reset sleep cycles. Better sleep reduces pain sensitivity and daytime fatigue, but any sleep medicine must be matched to age, other drugs and safety, especially in teenagers.PMC+1

17. Short-course oral corticosteroids – usually not routine for CMT1B
Steroids can relieve inflammatory neuropathies, but CMT1B is genetic, not inflammatory, so routine steroid use is not recommended. They may appear only in rare situations where another inflammatory problem overlaps. Long-term steroids cause serious side effects, so they are avoided unless strongly indicated.FDA Access Data+1

18. Treatment of co-existing conditions (e.g., diabetes, thyroid disease)
If a person with CMT1B also has diabetes, thyroid disease or vitamin deficiencies, drugs that control blood sugar, thyroid hormones or other metabolic factors indirectly protect nerves. For example, good diabetes control reduces extra nerve damage. These are not CMT-specific drugs but are critical for overall nerve health.nhs.uk+1

19. Vitamin B12 replacement when deficient
If tests show low vitamin B12, injections or high-dose tablets can improve neuropathy due to deficiency and prevent extra nerve injury on top of CMT. Typical regimens begin with frequent injections, then maintenance doses. Replacement is only useful if there is a proven deficiency.Cleveland Clinic+1

20. Multimodal pain management “cocktails”
Often, the best control comes from small doses of several medicines, such as a gabapentinoid plus duloxetine plus topical lidocaine, rather than high doses of one drug. This allows different mechanisms to work together with fewer side effects. A pain or neuromuscular specialist usually designs and adjusts such regimens.Charcot-Marie-Tooth Association+1

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Dietary Molecular Supplements

Important: supplements can interact with medicines and are not regulated like drugs. Always discuss them with a doctor or pharmacist first, especially for a teenager.

1. Alpha-lipoic acid (ALA)
ALA is an antioxidant that helps mitochondria handle oxidative stress. Trials in diabetic neuropathy suggest oral doses around 600 mg/day can modestly reduce pain and improve nerve blood flow. It may theoretically support stressed nerves in CMT, although direct evidence is limited. Possible side effects include stomach upset or low blood sugar in people on diabetes medicines.MDPI+1

2. Acetyl-L-carnitine (ALC)
ALC helps mitochondria produce energy and may support nerve regeneration. Meta-analyses in peripheral neuropathy show moderate pain reduction and improved nerve tests with doses often 500–1,000 mg two to three times daily. It is generally well tolerated, though mild nausea or restlessness can occur. Evidence is strongest for diabetic and chemotherapy-related neuropathy, not specifically CMT.PLOS+1

3. Coenzyme Q10 (CoQ10)
CoQ10 is a key mitochondrial antioxidant and electron carrier. In mitochondrial and peripheral nerve disorders, supplementation (commonly 100–300 mg/day in divided doses) may improve energy, reduce oxidative damage, and support nerve recovery, though data are still emerging. It is usually safe, with mild digestive side effects in some people.PubMed+1

4. B-complex vitamins (B1, B6, B9, B12)
Adequate B vitamins are essential for nerve myelin, energy metabolism, and repair. In deficiency states, replacing B1 or B12 clearly improves neuropathy. Typical supplement doses are modest daily amounts, but very high B6 doses can cause neuropathy, so balanced preparations and medical supervision are important.PubMed+1

5. Vitamin D
Vitamin D supports bone health, immunity, and possibly nerve function. Low levels are common in people with limited mobility. Supplement doses are tailored to blood levels (for example, 800–2,000 IU/day in many adults). Correcting deficiency may improve pain and muscle performance, but mega-doses without testing are unsafe.Elevation Health Center+1

6. Omega-3 fatty acids (fish oil or algal oil)
Omega-3 fats (EPA/DHA) help maintain nerve cell membranes and reduce inflammation. They are often taken as capsules providing around 500–1,000 mg/day of combined EPA/DHA, or eaten as fatty fish several times per week. At high doses they may thin the blood and cause digestive upset, so doses should be agreed with a clinician.Elevation Health Center+1

7. Magnesium
Magnesium helps nerve signal transmission and muscle relaxation. Modest supplementation may ease cramps or restless legs in some people. Doses must respect kidney function and are usually split to reduce diarrhoea. It is not a cure for CMT1B but can improve comfort and sleep in selected patients.Elevation Health Center+1

8. Antioxidant-rich polyphenols (curcumin, berry extracts)
Foods and supplements rich in antioxidants (like curcumin from turmeric or flavonoids from berries) may reduce oxidative stress that worsens nerve injury. Evidence for supplements is early; many experts prefer getting these via colourful fruits, vegetables, and spices rather than pills.The Foundation for Peripheral Neuropathy+1

9. Gamma-linolenic acid (GLA)
GLA, an omega-6 fatty acid found in evening primrose and borage oil, has shown some benefit in diabetic neuropathy trials, sometimes comparable to ALA. Typical doses are a few hundred milligrams per day. It may cause mild stomach upset or interact with certain medicines, so professional guidance is needed.e-dmj.org+1

10. Probiotics and gut-health-focused supplements
Because the gut and immune system are closely linked, some researchers explore probiotics and prebiotics to help chronic pain and inflammation. Evidence in neuropathy is still limited, but a healthy gut microbiome may support overall immunity and mood, indirectly helping people cope with chronic nerve disease.Verywell Health+1

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Immunity-Boosting and Regenerative / Stem-Cell-Related Drug Approaches

Currently, no immune-booster or stem-cell drug is approved specifically for CMT1B, but research is active. These points summarise concepts under investigation; they are not self-treatments and should only be used in clinical trials or under expert care.

1. Gene therapy targeting MPZ or related pathways
Researchers are exploring viral vectors (often AAV-based) to deliver healthy copies of genes or to silence toxic versions in CMT. For MPZ-related CMT1B, preclinical work aims to correct myelin defects directly in Schwann cells. These strategies are still in early stages and currently available only in research settings.Orpha.net+1

2. Neurotrophin-3 (NT-3) gene therapy
NT-3 is a growth factor that supports peripheral nerve survival and myelination. Small experimental trials in other forms of CMT have used gene therapy to increase NT-3 production, with early signals of improved nerve function. Safety, durability and access are still being studied, so this remains a future option, not standard care.FDA Access Data+1

3. Mesenchymal stem cell (MSC) therapies
Animal models of neuropathy suggest MSCs may release growth factors and anti-inflammatory molecules that protect or repair nerves. Early human studies in various neuropathies are ongoing, but there is no robust evidence yet for routine MSC use in CMT1B. Commercial “stem-cell clinics” should be approached with great caution.FDA Access Data+1

4. CoQ10 and related mitochondrial-targeted molecules
Some experimental molecules aim to improve CoQ10 availability or mitochondrial function more powerfully than standard CoQ10 supplements. Case reports in primary CoQ10 deficiency show dramatic neurological improvement, but this is a different condition from CMT. Lessons from these treatments may inform future regenerative strategies.PNAS+1

5. Immunisations (vaccines) to protect overall health
Routine vaccines (influenza, COVID-19, pneumococcal, etc.) do not directly treat CMT1B, but they prevent severe infections that can worsen weakness, trigger hospitalisation, and slow rehabilitation. Strong general immunity gives the nervous system a more stable environment for repair and adaptation.Health+1

6. Vitamin D and general immune-supportive therapy
Correcting vitamin D deficiency and maintaining a nutrient-rich diet rich in vitamins C, E, zinc and other micronutrients supports normal immune responses and may reduce infection risk. This is supportive care, not a CMT-specific cure, but it helps keep the body in better condition to handle chronic neuropathy.Health+1

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Surgical Treatments (Procedures and Why They Are Done)

Surgery is mostly for foot and ankle deformities, not for the nerves themselves. It is considered when bracing and therapy are not enough.

1. Soft-tissue releases (plantar fascia release, tendon lengthening)
Tight plantar fascia, calf muscles, and toe flexors can lock the foot into a high-arched, clawed position. Surgeons release or lengthen these tissues to allow the foot to sit flatter and more plantigrade (flat on the ground). This eases pressure points and makes bracing and shoe fitting easier.enmc.org+1

2. Tendon transfers
In CMT, some muscles are weak and others are relatively strong but unbalanced. Surgeons can move tendons from stronger muscles to replace the action of weak ones (for example, transferring tibialis posterior to help ankle dorsiflexion). This restores balance and may reduce the need for lifelong braces in some patients.Charcot-Marie-Tooth Association+1

3. Osteotomies (bone reshaping / realignment)
If bones have grown into a cavovarus shape (high arch and inward heel), cuts and wedges in the bones can realign the foot. Osteotomies aim to create a stable, plantigrade foot that spreads weight evenly. They are often combined with tendon transfers and soft-tissue releases for durable correction.PubMed+1

4. Arthrodesis (joint fusion) in severe deformity or arthritis
When joints are very damaged or unstable and other surgeries cannot provide enough stability, fusing one or more joints (for example, ankle or hindfoot) can give a solid, pain-reduced platform for walking. Fusion sacrifices motion but improves stability and pain in selected advanced cases.achot.cz+1

5. Spinal surgery for scoliosis (rare but possible)
Some people with severe CMT develop scoliosis that progresses and affects balance or breathing. In those cases, spinal fusion or other corrective procedures may be required. This is decided by spine and neuromuscular teams together and is only done when scoliosis is clearly progressive and symptomatic.RSNA Publications+1

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Prevention and Daily Self-Care

1. Avoid neurotoxic medicines and high-dose B6 supplements unless essential.FDA Access Data+1

2. Protect feet with good shoes, daily inspection, and quick treatment of blisters or sores.The Foundation for Peripheral Neuropathy+1

3. Use braces, orthoses, and assistive devices early, not late, to avoid falls and deformity.Charcot-Marie-Tooth Association+1

4. Keep a healthy body weight to reduce stress on weak ankles and feet.The Foundation for Peripheral Neuropathy+1

5. Stay physically active with safe, low-impact exercise most days of the week.ScienceDirect+1

6. Have regular neurologist, physiotherapist, and orthopaedic reviews to catch changes early.PMC+1

7. Manage other health conditions (diabetes, thyroid disease, vitamin deficiencies).nhs.uk+1

8. Keep vaccinations up to date to reduce infection-related setbacks.Health+1

9. Prioritise sleep and stress control, which strongly influence pain and fatigue.HealthXchange+1

10. Seek psychological and social support early if mood, motivation, or school/work participation are slipping.PMC+1

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When to See Doctors – And When It Is Urgent

You should see a neurologist or neuromuscular clinic regularly if you have CMT1B, even when things feel stable, to track progression and update braces, therapy, and medications.

Seek prompt medical review if you notice:

• Sudden or rapidly worsening weakness, especially if it is very different from your usual slow change.Orpha.net+1

• New trouble walking, frequent falls, or ankle sprains despite braces.PubMed+1

• New severe foot or leg pain, swelling, redness, or warmth that could indicate fracture, ulcer, or infection.PMC+1

• New numbness or weakness in the hands making daily tasks unsafe (for example, dropping hot objects).PMC+1

• Signs of vitamin deficiency or other systemic illness: unexplained weight loss, extreme fatigue, shortness of breath, or mood changes.Cleveland Clinic+1

Go to emergency care if you have:

• Sudden inability to walk when you could walk normally before.

• High fever with leg or foot redness and severe pain (possible deep infection).

• Sudden breathing difficulty, chest pain, or confusion.

These urgent signs are rare in CMT1B itself but require immediate assessment.nhs.uk+1

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What to Eat and What to Avoid

1. Base meals on vegetables and fruits. Colourful produce gives antioxidants, vitamins and fibre that help reduce inflammation and support nerve health.The Foundation for Peripheral Neuropathy+1

2. Choose whole grains instead of refined starch. Brown rice, oats, and whole-grain bread provide B vitamins and steady energy, which can help manage fatigue and blood sugar.The Foundation for Peripheral Neuropathy+1

3. Include lean protein with each meal. Fish, eggs, pulses, and modest amounts of poultry provide amino acids for muscle maintenance and nerve repair.Asuta Health+1

4. Eat omega-3-rich foods several times per week. Fatty fish, flaxseeds, chia, and walnuts help support nerve membranes and may reduce inflammation.Asuta Health+1

5. Ensure enough B vitamins, especially B12. Include foods like eggs, dairy, fish or fortified cereals, or supplements if prescribed, to avoid extra nerve damage from deficiency.Cleveland Clinic+1

6. Limit added sugar and ultra-processed foods. Sweet drinks and junk foods can worsen weight, blood sugar and inflammation, making neuropathy symptoms harder to control.Healthgrades Resources+1

7. Keep alcohol low or avoid it. Alcohol is directly toxic to nerves and can significantly worsen neuropathy in susceptible people.The Foundation for Peripheral Neuropathy+1

8. Use healthy fats (olive oil, nuts, seeds) instead of trans-fats. This supports heart and nerve health and fits within a Mediterranean-style pattern.PMC+1

9. Stay well hydrated. Adequate water supports circulation, digestion and medication tolerance, and can reduce headaches and fatigue.MDPI+1

10. Avoid extreme or fad diets without supervision. Very restrictive diets can cause nutrient gaps that harm nerves; any special diet should be monitored by a doctor or dietitian.MDPI+1

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Frequently Asked Questions (FAQs)

1. Can CMT1B be cured today?
No. At present, there is no cure for the underlying gene problem in CMT1B, but supportive treatments—therapy, orthotics, surgery, and pain management—can greatly improve function and comfort. Research in gene therapy and regenerative medicine is promising but still experimental.Orpha.net+1

2. Will I definitely need surgery?
Not everyone needs surgery. Many people manage well with AFOs, physiotherapy and custom footwear. Surgery is usually considered when deformity, pain, or instability remain severe despite good conservative care. Decisions are highly individual and made with an experienced orthopaedic team.ScienceDirect+1

3. Can exercise make the disease worse?
Appropriate, supervised exercise almost always helps. Over-aggressive training with very heavy loads can over-fatigue weak muscles, but well-planned aerobic and strengthening programs support mobility and reduce complications. A neuromuscular therapist can design a safe plan.ScienceDirect+1

4. Why do I get so tired even when my muscles are not very weak?
Nerves in CMT send signals less efficiently, so muscles must work harder for the same movement. The brain also has to concentrate more to stay balanced. This combination causes “neuromuscular fatigue” that feels different from normal tiredness. Pacing and energy-saving strategies are very helpful.PMC+1

5. Is neuropathic pain common in CMT1B?
Yes, many people report burning, shooting or electric-shock-like pain, especially in feet and sometimes hands. This pain comes from damaged sensory nerves sending abnormal signals. Neuropathic pain medicines and non-drug treatments can lessen it, but it may not disappear completely.Charcot-Marie-Tooth Association+1

6. Are children treated differently from adults?
Core principles are similar, but children need growth-friendly braces, age-appropriate exercise, and careful attention to school participation, self-image and family planning for the future. Medication choices and doses differ by age and weight. A paediatric neuromuscular team usually coordinates care.Orpha.net+1

7. Can diet alone fix CMT1B?
No diet can change the MPZ mutation, but a nutrient-dense, balanced pattern supports nerves, muscles, bones and overall health. Good nutrition makes therapy, surgery recovery, and daily life easier and can reduce secondary complications like obesity and diabetes.The Foundation for Peripheral Neuropathy+1

8. Should I avoid pregnancy if I have CMT1B?
Many people with CMT have safe pregnancies and births. However, symptoms may temporarily worsen, and there is a genetic transmission risk. Pre-conception genetic counselling can explain options like partner testing, prenatal diagnosis or pre-implantation genetic testing. Obstetric and neuromuscular teams should follow pregnancy together.Orpha.net+1

9. What shoes are best?
Shoes with a firm heel counter, roomy toe box, and stable sole are usually recommended. Rocker-bottom soles or extra-depth designs may help high arches and claw toes. A podiatrist or orthotist can match shoes to your specific deformities and braces.PMC+1

10. Does CMT1B affect life expectancy?
For most people, CMT1B mainly affects movement, not lifespan. Serious complications such as major falls, severe scoliosis affecting breathing, or profound foot ulcers are the main risks—and these can often be prevented with proactive care and follow-up.Orpha.net+1

11. Are there medicines I should never take if I have CMT?
Some chemotherapy agents (especially vincristine) and possibly other highly neurotoxic drugs should be avoided or used only with strict monitoring, as they can dramatically worsen neuropathy. Always tell any doctor that you have CMT before starting new medicines.FDA Access Data+1

12. How often should I have check-ups?
Most people benefit from yearly neuromuscular reviews, or more often during periods of rapid change (adolescence, pregnancy, or after major surgery). Physiotherapy and orthotic reviews may be needed every 6–12 months to adjust exercises and devices.PMC+1

13. Can I play sports?
Many individuals with CMT1B can enjoy low-impact sports such as swimming, cycling, and carefully supervised gym work. High-risk sports involving jumping, sudden direction changes or ankle twisting (for example, basketball on hard floors) may be limited. The best plan is personalised and built with your therapy team.ScienceDirect+1

14. Will gene therapy be available soon?
Gene therapy for CMT is advancing quickly in animal models and early human studies, but large trials and long-term safety data are still needed. It is realistic to say that promising options are emerging, but timing and access are not yet certain.Orpha.net+1

15. What is the most important thing I can do right now?
The single most powerful step is to build a long-term partnership with a neuromuscular team (neurologist, physio, OT, orthotist, orthopaedic surgeon, and dietitian). Combine regular exercise, good braces, foot care, healthy diet, and emotional support. These things, done consistently, often matter more than any one pill.PMC+1

Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical  history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.

The article is written by Team RxHarun and reviewed by the Rx Editorial Board Members

Last Updated: December 25, 2025.