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

Charcot-Marie-Tooth disease type 1B (CMT1B) is a rare inherited nerve disease that mainly affects the nerves in the legs, feet, hands, and arms. These nerves are called peripheral nerves. They carry signals from the brain and spinal cord to the muscles and back from the skin to the brain. In CMT1B, these nerves slowly become weak and work less well over many years. NCBI+1

Charcot-Marie-Tooth disease type 1B (CMT1B) is a genetic nerve disease where a change in the MPZ gene (myelin protein zero) damages the myelin covering of peripheral nerves. This slows nerve signals and leads to weakness, thin muscles, numbness, and foot deformities such as high arches and hammer toes. There is no cure yet, but many treatments can reduce symptoms, protect joints, and improve daily function. Treatment usually combines non-drug therapies, medicines for pain and cramps, surgery for severe deformities, and lifestyle support. NCBI+2

CMT1B happens because of a change (mutation) in a gene called MPZ. This gene gives the instructions to make a protein called myelin protein zero (P0). This protein is very important for the myelin sheath, which is the “insulation” around nerves. When MPZ is faulty, the myelin sheath becomes damaged, and nerve signals move more slowly and less strongly. This is called a “demyelinating neuropathy.” Muscular Dystrophy Association+1

CMT1B is usually passed on in an autosomal dominant way. This means a person can get the disease if they inherit one changed copy of the MPZ gene from either parent. It often causes slowly progressive weakness, thin muscles in the feet and legs, high-arched feet, balance problems, and reduced feeling in the feet and hands. Symptoms can start in childhood or later in adult life and can be mild or more severe, depending on the exact MPZ mutation. MalaCards+2PM&R KnowledgeNow+2

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Other names

Charcot-Marie-Tooth disease type 1B is known by several other names in medical books and research papers. All these names describe the same or closely related conditions:

1. CMT1B – the most common short name used by doctors and researchers. Muscular Dystrophy Association+1

2. Charcot-Marie-Tooth disease, demyelinating, type 1B – this highlights that it is a demyelinating form of CMT. MalaCards

3. Hereditary motor and sensory neuropathy type I (MPZ-related) – older term; “hereditary” means inherited, “motor and sensory neuropathy” means it affects movement and feeling. ScienceDirect+1

4. MPZ-related CMT or MPZ neuropathy – used when talking about all nerve diseases linked to MPZ mutations, including CMT1B and related phenotypes. JCN+1

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Types of Charcot-Marie-Tooth disease type 1B

Doctors now know that changes in the MPZ gene can cause different patterns of disease. These are not official “separate diseases” with new names, but they are useful clinical types of MPZ-related CMT1B: PMC+3PMC+3Nature+3

1. Early-onset severe demyelinating CMT1B
   In some children, symptoms start in infancy or early childhood. They may walk late, fall often, and have very slow nerve conduction speeds. Muscle weakness and disability can be more severe. This pattern overlaps with a condition called Dejerine–Sottas neuropathy (a very severe early-onset hereditary neuropathy).

2. Childhood-onset “classic” CMT1B
   Many people develop symptoms in school age. They may notice high-arched feet, ankle weakness, trouble running, and slowly increasing difficulty with balance. Nerve conduction studies show demyelinating neuropathy. This is the “typical” CMT1B picture.

3. Adult-onset mild CMT1B
   Some MPZ mutations cause symptoms only in adulthood. People may first notice numbness in the feet, mild foot drop, or cramps in mid-life. Weakness and sensory loss progress but often remain moderate. This is sometimes called late-onset MPZ neuropathy.

4. Intermediate MPZ neuropathy
   In some families, nerve conduction speeds are not as slow as in classic demyelinating CMT, but not normal either. This is called an “intermediate” neuropathy. Symptoms can be mild to moderate, with both myelin and axons affected.

5. Axonal MPZ-related neuropathy (CMT2-like)
   Certain MPZ mutations mainly damage the nerve axon rather than the myelin. These patients may be diagnosed as having an axonal CMT (CMT2). They still have length-dependent weakness and sensory loss, but nerve conduction slowing is less marked. JCN+1

6. MPZ neuropathy with extra features
   Some people with MPZ mutations may have extra signs such as neuropathic pain, hearing loss, tremor, or balance problems (ataxia). These features depend on the exact mutation and may appear in only some family members. PMC+2MDPI+2

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Causes

The true primary cause of CMT1B is mutation in the MPZ gene. There are not 20 completely different causes, but there are many detailed mechanisms and risk-related factors around this genetic cause. Below are 20 important points that explain why and how the disease happens and who is at higher risk.

1. MPZ gene mutation (main cause)
   CMT1B is caused by a harmful change (mutation) in the MPZ gene on chromosome 1q22. This mutation changes the structure or amount of myelin protein zero and leads to demyelinating neuropathy. Muscular Dystrophy Association+2PM&R KnowledgeNow+2

2. Abnormal myelin protein zero structure
   Many MPZ mutations change one amino acid in the protein. This small change can alter how the protein folds and sticks to other myelin proteins. Misfolded protein makes the myelin sheath weaker and more likely to break down. ScienceDirect+2Nature+2

3. Defective myelin compaction
   Myelin protein zero is a major structural protein that helps “zip” the layers of myelin together. When it does not work, the myelin becomes loose and poorly compacted, so nerve signals travel slowly and nerves are more vulnerable to injury. PMC+2JCN+2

4. Dominant-negative effect
   In autosomal dominant diseases, the faulty protein can interfere with the normal protein from the healthy gene copy. In some MPZ mutations, abnormal protein can disturb normal myelin and make disease more severe. ScienceDirect+1

5. Loss-of-function of MPZ
   Some mutations reduce the amount of working MPZ protein (haploinsufficiency). Too little MPZ means the myelin cannot be built correctly, leading to demyelination and neuropathy. ScienceDirect+1

6. Gain-of-toxic-function in Schwann cells
   Certain MPZ variants cause toxic stress inside Schwann cells (the myelin-making cells). Misfolded MPZ may be trapped in the endoplasmic reticulum, causing cell stress and eventual damage to myelin. ScienceDirect+1

7. Axonal degeneration secondary to demyelination
   When myelin is unstable, the underlying axon also suffers. Over time, repeated demyelination and remyelination lead to axonal loss, which worsens weakness and muscle wasting. The Lancet+1

8. Family history of MPZ mutation
   Because CMT1B is autosomal dominant, having a parent with an MPZ mutation strongly increases the chance of inheriting the same variant and developing disease. The risk for each child is about 50%. NCBI+1

9. New (de novo) MPZ mutations
   Sometimes CMT1B appears in a person with no family history because a new MPZ mutation occurred in the egg or sperm. Their children, however, can inherit the condition. NCBI+1

10. Specific mutation type and position
    Different MPZ mutations affect different parts of the protein. Some lead to very severe early-onset disease, while others cause milder adult-onset neuropathy. This “genotype-phenotype” relationship is an important cause of variation in severity. Nature+1

11. Other genetic modifiers
    Some people carry additional genetic variants in other nerve or myelin genes. These modifying genes may make neuropathy milder or more severe, even with the same MPZ mutation. The Lancet+1

12. Metabolic factors (like diabetes)
    Diseases such as diabetes also damage nerves. In a person with CMT1B, diabetes can add extra nerve damage, making weakness, numbness, and pain worse than they would be from CMT1B alone. The Lancet+1

13. Vascular disease and poor blood supply
    Some evidence suggests that vascular disease may worsen nerve health in MPZ neuropathy. Poor blood flow can deprive nerves of oxygen and nutrients and cause further axonal loss. Wiley Online Library+1

14. Nerve compression and trauma
    In CMT, nerves are already fragile. Long-lasting pressure (tight shoes, repeated ankle injuries, compressed nerves at the knee or wrist) can cause extra damage and worsen symptoms. NCBI+1

15. Obesity and inactivity
    Extra body weight and low physical activity do not cause CMT1B, but they increase strain on weak legs and feet and raise the risk of falls and pain. This can make disability appear worse and faster. PM&R KnowledgeNow+1

16. Poor footwear and foot care
    High-arched feet and hammertoes are common in CMT and can cause pressure points. If shoes do not fit well or foot care is poor, patients may get ulcers and pain, which further limit walking. NCBI+2Charcot-Marie-Tooth Association+2

17. Coexisting autoimmune or inflammatory neuropathy
    Rarely, a person with hereditary neuropathy may also develop an acquired immune-mediated neuropathy. This “double hit” can cause a faster decline in nerve function. PMC+1

18. Toxic exposures (e.g., some chemotherapy drugs)
    Certain medications, such as some chemotherapy agents, are toxic to peripheral nerves. In someone with CMT1B, these drugs can make neuropathy much worse, so they are used with great caution. PMC+1

19. Alcohol misuse
    Heavy long-term alcohol use can cause additional neuropathy. If a person with CMT1B drinks heavily, they may develop more numbness, burning pain, and weakness than expected from CMT alone. The Lancet+1

20. Aging
    Normal aging slowly damages nerves in everyone. In CMT1B, this natural age-related decline adds to genetic neuropathy, so symptoms usually progress with age, especially in later decades of life. NCBI+1

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Symptoms of Charcot-Marie-Tooth disease type 1B

1. Slowly progressive weakness in the feet and ankles
   One of the earliest signs is weakness in the muscles that lift the foot. People may have trouble standing on their heels or notice that walking up stairs feels harder. Over years, this weakness slowly becomes more obvious. NCBI+2MalaCards+2

2. Foot drop and tripping
   Because the foot cannot lift properly, the toes may drag on the ground, causing frequent tripping or stumbling. People may lift their knees higher to avoid catching the toes when they walk. NCBI+1

3. High-arched feet (pes cavus)
   Many people with CMT1B develop high-arched feet. The arch of the foot becomes very curved, and the toes may claw. This is due to long-term imbalance between weak and relatively stronger muscles in the foot. MalaCards+2Muscular Dystrophy Association+2

4. Hammertoes and other foot deformities
   Toes may bend at the middle joint (hammertoes), making shoe fitting difficult and causing corns or calluses. Over time, the shape of the foot and ankle can change more, and some people develop ankle instability. NCBI+1

5. Distal muscle wasting in legs (thin calves)
   The muscles in the lower legs, especially the front and sides, shrink and look thin. This is sometimes called an “inverted champagne bottle” or “stork-like” leg appearance. It happens because weak muscles are not used as much and lose bulk. MalaCards+1

6. Weakness in the hands and fingers
   Later in the disease, weakness can also affect the small muscles of the hands. People may have trouble doing fine tasks such as buttoning shirts, using keys, or writing for long periods. NCBI+1

7. Numbness and reduced feeling in the feet
   Sensory nerves are affected, so people may feel tingling, pins and needles, or numbness in their toes and feet. They may not feel temperature or pain as clearly, which can increase the risk of unnoticed injuries. NCBI+1

8. Numbness and sensory loss in the hands
   With time, the same sensory changes can reach the hands. People may drop objects because they cannot feel them well or may not feel small cuts or burns on their fingers. NCBI+1

9. Absent or reduced tendon reflexes
   Reflexes at the ankles and knees are often reduced or absent in CMT1B. Doctors may notice that tapping the tendon with a reflex hammer produces little or no movement. This is a common exam finding in hereditary neuropathy. PMC+1

10. Balance problems and unsteady walking
    Because of weakness and loss of feeling in the feet, it becomes harder to know where the feet are in space. People may feel unsteady, especially in the dark or on uneven ground, and they may sway or fall more easily. NCBI+2PM&R KnowledgeNow+2

11. Fatigue in legs with activity
    Walking or standing for long periods can lead to heavy, tired legs. Muscles that are partly weak must work harder, so people tire more quickly than expected for their age. NCBI+1

12. Neuropathic pain, burning, or electric sensations
    Some people with MPZ mutations develop neuropathic pain, such as burning, shooting, or electric-like pain in the feet. This can be intermittent or constant and may worsen at night. MDPI+1

13. Tremor or shakiness
    A small number of patients can develop tremor, especially in the hands. This may make fine tasks harder and can be part of the wider MPZ-related disease spectrum. PMC+1

14. Hearing loss in some families
    Certain MPZ mutations have been linked with hearing problems or deafness. Not everyone is affected, but when present, it usually develops gradually and can add to disability. PMC+2ResearchGate+2

15. Spine curvature (scoliosis) or posture changes
    Long-standing muscle imbalance may lead to curved spine (scoliosis) or other posture changes. These changes can cause back pain and add to balance difficulties. NCBI+2PM&R KnowledgeNow+2

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Diagnostic tests for Charcot-Marie-Tooth disease type 1B

Doctors use a mix of physical exam, bedside (manual) tests, lab and pathological tests, electrodiagnostic studies, and imaging to diagnose CMT1B and to rule out other causes of neuropathy.

Physical exam tests

1. Full neurological examination
   The doctor checks muscle strength, reflexes, sensation, and coordination in all limbs. They look for distal weakness, reduced reflexes, and length-dependent sensory loss, which are typical of CMT. This exam guides further testing. PMC+2NCBI+2

2. Gait analysis (watching how the person walks)
   The clinician watches the patient walk across the room and on heels and toes. A high-stepping gait, foot drop, and difficulty heel walking suggest distal leg weakness, which is very common in CMT1B. NCBI+2MalaCards+2

3. Inspection of feet and hands
   The doctor closely looks at foot arches, toes, ankles, and hand muscles. High-arched feet, hammertoes, and thin calf and hand muscles support the diagnosis of hereditary neuropathy instead of another cause. NCBI+1

4. Reflex testing with a hammer
   Reflexes at the Achilles tendon (ankle) and knee are tested using a reflex hammer. Absent or weak reflexes are a common sign of peripheral neuropathy such as CMT. PMC+1

5. Posture and spine examination
   The doctor checks for scoliosis, pelvic tilt, or other posture changes. These can appear in long-standing CMT and may influence treatment, such as the need for bracing or physiotherapy. NCBI+2PM&R KnowledgeNow+2

Manual (bedside) tests

6. Manual muscle testing (MRC grading)
   The doctor asks the person to move joints against resistance and grades strength from 0 (no movement) to 5 (normal). Weakness in ankle dorsiflexors and toe extensors is typical in CMT1B. PMC+2PM&R KnowledgeNow+2

7. Light touch and pinprick testing
   Using cotton wool or a small pin, the examiner tests light touch and sharp sensation along the arms and legs. A “glove and stocking” pattern of reduced feeling suggests length-dependent neuropathy. PMC+2NCBI+2

8. Vibration sense with a tuning fork
   A vibrating tuning fork is placed on bones at the toes and ankles. People with CMT may notice vibration less clearly or lose it earlier than normal, showing large-fiber sensory damage. PMC+1

9. Romberg test (balance with eyes closed)
   The person stands with feet together and then closes their eyes. If they sway or lose balance, it suggests that sensory input from the feet is poor. This supports a diagnosis of sensory neuropathy. PMC+1

10. Heel-toe and tandem walking tests
    The person walks on heels, toes, and then in a straight line placing one foot in front of the other. Difficulty in these tasks indicates distal weakness and balance problems typical of CMT. NCBI+2Charcot-Marie-Tooth Association+2

Lab and pathological tests

11. Routine blood tests to rule out other neuropathies
    Doctors usually check blood sugar, vitamin B12, folate, thyroid function, kidney and liver function, and sometimes serum protein electrophoresis. These tests help exclude common acquired causes of neuropathy like diabetes, vitamin deficiency, or thyroid disease. PMC+2The Lancet+2

12. Genetic testing panel for CMT genes
    A gene panel looks at many known CMT genes at once, including PMP22, GJB1, MFN2, and MPZ. This is often the most efficient way to find the exact genetic cause in someone with suspected CMT. MDPI+2Dove Medical Press+2

13. Targeted MPZ gene sequencing
    If the clinical picture and nerve conduction studies strongly suggest CMT1B or MPZ-related disease, the MPZ gene can be sequenced in detail to find mutations. This confirms the diagnosis at the DNA level. JCN+2OUP Academic+2

14. Family genetic testing (cascade testing)
    Once an MPZ mutation is found in one person, relatives can be offered testing to see if they carry the same variant. This helps with early diagnosis, family planning, and understanding disease patterns in the family. NCBI+1

15. Nerve biopsy and pathology (used rarely)
    In the past, nerve biopsy (usually of the sural nerve) was used more often. Today, it is usually reserved for unclear cases where genetic tests have not found a cause. Biopsy in CMT1B may show segmental demyelination and “onion bulb” formations from repeated demyelination and remyelination. PMC+2SciSpace+2

Electrodiagnostic tests

16. Nerve conduction studies (NCS)
    Electrodes are placed on the skin over nerves, and small electrical pulses are used to measure how fast and how strongly nerves conduct signals. In CMT1B, motor nerve conduction velocities are usually markedly slowed, showing a demyelinating pattern. PMC+2Charcot-Marie-Tooth Association+2

17. Electromyography (EMG)
    A fine needle electrode is inserted into muscles to measure their electrical activity at rest and with movement. EMG in CMT can show chronic denervation and reinnervation, helping to confirm a neuropathic process and rule out primary muscle disease. PMC+2Charcot-Marie-Tooth Association+2

18. F-wave and late response studies
    F-wave tests measure signals that travel back and forth along motor nerves. In demyelinating neuropathies like CMT1, F-wave latencies are often prolonged. This supports the diagnosis and helps distinguish demyelinating from axonal neuropathies. PMC+1

Imaging tests

19. MRI or ultrasound of peripheral nerves (nerve imaging)
    In some centers, MRI neurography or high-resolution nerve ultrasound can show thickened peripheral nerves in hereditary neuropathies. These tests are not always needed but can support the diagnosis and rule out focal nerve entrapments. PMC+2Cureus+2

20. X-ray or MRI of feet and spine
    X-rays or MRI can show high arches, hammertoes, or scoliosis. They help orthopaedic and rehab doctors plan braces, surgery, or physiotherapy to improve walking and prevent complications in people with CMT1B. NCBI+2MalaCards+2

Non-Pharmacological Treatments (Therapies and Others)

1. Individualized Physical Therapy Exercise Program
A physical therapist designs a safe exercise plan to keep muscles strong and joints flexible. This may include stretching, resistance training, and balance drills. The main purpose is to slow contractures, improve walking, and reduce falls. Exercise works by using remaining muscle fibers and helping the brain adapt to slower nerve signals. Physiopedia+2MDPI+2

2. Stretching for Ankles, Feet, and Calves
Gentle daily stretching of calves, Achilles tendon, toes, and ankle liguments helps prevent the muscles and soft tissue from becoming short and stiff. The purpose is to delay fixed deformities and reduce pain from tight tendons. Stretching works by lengthening muscles and connective tissue so joints can move through a more normal range. Physiopedia+1

3. Strengthening of Key Muscle Groups
Targeted strengthening of dorsiflexors (muscles that lift the foot), hip muscles, and core supports better walking and stability. The purpose is to make the best use of the muscles that still work. Strengthening uses repeated muscle contraction to build muscle fibers and improve nerve–muscle communication, even when nerves are partly damaged. MDPI+1

4. Balance and Proprioception Training
Simple exercises like standing on one leg (with support), using foam pads, or guided balance drills train the body to keep upright despite weak muscles and loss of sensation. The purpose is to cut down on falls and injuries. These exercises stimulate the brain to use vision, inner ear, and remaining nerve signals more efficiently to control posture. MDPI+1

5. Gait Training and Walking Re-education
A therapist watches how the person walks and teaches safer patterns, sometimes with video feedback. The purpose is to reduce tripping, improve foot placement, and save energy. Gait training works by building new movement habits that compensate for foot drop and muscle imbalance, helping the person use braces and shoes correctly. MDPI+1

6. Ankle-Foot Orthoses (AFOs)
AFO braces are light devices worn in shoes to hold the foot up and keep the ankle stable. The purpose is to control foot drop, reduce ankle sprains, and make walking smoother and safer. Mechanically, AFOs keep the ankle in a better position during swing and stance phases, so the toes do not drag and the knee does not over-bend. PMC+2ScienceDirect+2

7. Custom Footwear and Shoe Inserts
Special shoes, insoles, and arch supports help support high arches, widen narrow shoes, and cushion the foot. The purpose is to prevent pressure sores, calluses, and pain in deformed feet. These devices work by redistributing body weight across the sole of the foot and stabilizing the heel and arch during each step. Charcot-Marie-Tooth Association+1

8. Occupational Therapy for Hand and Daily Activities
Occupational therapists teach ways to dress, cook, write, and use phones or computers despite hand weakness. They may suggest special grips and adaptive tools. The purpose is to keep independence in daily living. The therapy works by simplifying tasks, protecting joints, and training alternative hand movements that need less strength. ScienceDirect+1

9. Hand and Wrist Splints
Splints can support weak wrists and fingers, improve grip, and prevent joint deformities in the hands. The purpose is to allow safer lifting and handling of objects. Splints work by holding joints in a functional position and reducing strain on weakened tendons and small muscles in the hand. PubMed+1

10. Podiatry Care (Foot Skin and Nail Care)
Regular visits to a podiatrist help keep nails trimmed and calluses treated, and check for ulcers on numb feet. The purpose is to prevent small injuries from turning into infections or chronic sores. This care works by early detection of pressure spots and by teaching proper hygiene and shoe choices. ScienceDirect+1

11. Pain-Focused Physical Modalities
Methods like heat, cold packs, gentle massage, and transcutaneous electrical nerve stimulation (TENS) can ease muscle pain and cramps. The purpose is to reduce discomfort without always relying on medicines. These tools work by changing how pain signals are carried from the skin and muscles to the spinal cord and brain. ScienceDirect+1

12. Energy Conservation and Fatigue Management
Therapists teach how to plan the day, take rest breaks, and use devices like wheeled chairs or scooters for long distances. The purpose is to prevent exhaustion and allow important activities to be done. The method works by balancing activity and rest so the limited nerve and muscle power is used wisely. ScienceDirect+1

13. Fall-Prevention Home Modifications
Simple changes like removing loose rugs, adding handrails, and improving lighting make walking at home safer. The purpose is to lower the risk of fractures and head injuries. These changes work by eliminating tripping hazards and giving more stable points for support when balance is poor. ScienceDirect+1

14. Psychological Support and Counseling
Living with a chronic nerve disease can cause anxiety, sadness, or low self-esteem. Counseling, support groups, or online communities give emotional help and coping skills. The purpose is to improve mental health and long-term treatment adherence. Counseling works by helping people adjust to limitations and maintain a positive identity beyond the illness. Mayo Clinic+1

15. Genetic Counseling for Patient and Family
Genetic counselors explain MPZ mutations, inheritance patterns, and options for family planning or testing. The purpose is to help families understand risks and make informed decisions. Genetic counseling works by translating complex genetic information into clear advice about recurrence risk, testing of relatives, and prenatal options. NCBI+2www.elsevier.com+2

16. Vocational Rehabilitation and Workplace Adaptation
Specialists can help adjust work tasks, suggest ergonomic chairs, speech-to-text, or reduced standing time. The purpose is to keep employment as long as possible. This service works by matching job demands to the person’s physical abilities and preventing overuse injuries. ScienceDirect+1

17. Weight Management and Gentle Aerobic Exercise
Light aerobic activities like cycling, swimming, or walking with supports help protect the heart and control weight without over-loading weak muscles. The purpose is to avoid extra strain on deformed feet and knees. Aerobic exercise works by strengthening the cardiovascular system and improving endurance. Physiopedia+1

18. Education About Skin Checks and Foot Care
People are taught to look at their feet every day for blisters, redness, or cuts, especially if sensation is poor. The purpose is early detection of problems. This strategy works by catching issues before they become serious infections or ulcers that are hard to heal. ScienceDirect+1

19. Use of Mobility Aids (Canes, Walkers, Wheelchairs)
Mobility aids are recommended when balance and strength are very poor or with long distances. The purpose is to improve independence and safety. These devices work by giving extra support points, spreading weight, and reducing the effort needed from weak leg muscles. ScienceDirect+1

20. Multidisciplinary Care in a Neuromuscular Clinic
Best care often comes from a team including neurologists, physiatrists, therapists, orthopaedic surgeons, and genetic counselors. The purpose is to cover all aspects of the disease. This model works by coordinating treatments so pain, function, mental health, and family issues are all addressed together. PMC+2Clinical Actionability+2

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Drug Treatments

No drug is currently FDA-approved specifically to cure CMT1B. Medicines below are commonly used to treat neuropathic pain, muscle pain, mood, or sleep, based on labels and neuropathic pain research. Always follow a doctor’s plan.

I will give typical adult dosing ranges from FDA labels, but your doctor decides your exact dose.

1. Pregabalin (Lyrica)
Pregabalin is an anticonvulsant that is FDA-approved for several neuropathic pain conditions such as diabetic neuropathy and post-herpetic neuralgia, and is often used off-label for CMT-related nerve pain. A common starting dose is 75 mg twice daily, adjusted up to 300–600 mg/day if needed. It works by binding to calcium channels in nerve cells and reducing release of pain-related chemicals. Side effects can include dizziness, sleepiness, weight gain, and swelling. Texas Health and Human Services+3FDA Access Data+3FDA Access Data+3

2. Gabapentin (Neurontin)
Gabapentin is another anticonvulsant widely used for neuropathic pain. Typical adult doses range from 900 to 3,600 mg/day in divided doses, slowly increased to reduce side effects. It reduces abnormal excitability in damaged nerves and lowers burning or shooting pain. Common side effects include dizziness, tiredness, and swelling; labels also warn about mood changes and suicidal thoughts. HPSJ/MVHP+3FDA Access Data+3FDA Access Data+3

3. Duloxetine (Cymbalta)
Duloxetine is an SNRI antidepressant approved for diabetic peripheral neuropathic pain, fibromyalgia, and depression. It is usually started at 30 mg once daily and may be increased to 60 mg/day. It increases serotonin and norepinephrine in the brain and spinal cord, which helps dampen pain signals and improve mood. Side effects may include nausea, dry mouth, sweating, and increased risk of suicidal thoughts in young people. Zanco Journal of Medical Sciences+3FDA Access Data+3FDA Access Data+3

4. Amitriptyline
Amitriptyline is a tricyclic antidepressant often used at low doses at night (e.g., 10–25 mg, titrated upward) for neuropathic pain and sleep. It blocks serotonin and norepinephrine reuptake and also has a direct effect on pain pathways. It can cause dry mouth, constipation, weight gain, and drowsiness, and has important safety warnings about heart rhythm and suicidal thoughts in young people. FDA Access Data+2FDA Access Data+2

5. Tramadol (Ultram / Ultram ER)
Tramadol is a synthetic opioid analgesic for moderate to moderately severe pain. Doses vary (for example, 50–100 mg every 4–6 hours as needed for immediate release, with maximum daily limits). It works by weak opioid receptor activation and blocking serotonin and norepinephrine reuptake. Side effects include nausea, dizziness, constipation, and serious risks like addiction, respiratory depression, and seizures, so it is used cautiously. FDA Access Data+3FDA Access Data+3FDA Access Data+3

6. Non-steroidal Anti-Inflammatory Drugs (NSAIDs, e.g., Ibuprofen)
NSAIDs like ibuprofen are used for muscle and joint pain, not neuropathic burning pain. Doses and brands differ, but they usually reduce inflammation and prostaglandin production, lowering soreness after over-use or after surgery. Side effects include stomach upset, ulcer risk, and kidney or heart problems in long-term high doses. Doctor guidance is important. Mayo Clinic+1

7. Acetaminophen (Paracetamol)
Acetaminophen is often used for mild to moderate musculoskeletal pain and can be combined with other therapies. The exact dose must respect maximum daily limits to avoid liver damage. It works mainly in the central nervous system to reduce pain and fever. Side effects are usually mild at proper doses but liver injury can occur with overdose or alcohol use. Mayo Clinic+1

8. Topical Lidocaine (Patches or Gels)
Lidocaine patches or gels can be used on painful skin areas, especially if touch sensitivity or localized burning is present. The medicine numbs superficial nerves by blocking sodium channels. It is applied for limited hours per day according to the product label. Local skin irritation or numbness are the most common side effects. PMC+1

9. Capsaicin Topical Preparations
Capsaicin cream or patches can be used in some neuropathic pain conditions by depleting substance P, a pain-signaling chemical in nerves. It may cause strong burning at first, which often lessens over days. It is used carefully on intact skin and not near eyes. Side effects are usually local burning and redness. PMC+1

10. Tizanidine or Baclofen (for Muscle Cramps/Spasticity)
In some patients with painful muscle cramps or spasticity, muscle relaxants such as baclofen or tizanidine may be tried. Doses start low and are slowly raised. These drugs act on spinal cord reflexes and GABA or alpha-2 receptors to relax muscle tone. Side effects include sleepiness, low blood pressure, and weakness, so they must be monitored closely. Clinical Actionability+1

11. Low-Dose Opioids (Short-Term, Last-Line)
In severe pain crises that do not respond to other drugs, short-term opioid therapy might be considered. Opioids act on central opioid receptors to block pain signals. Because they carry high risks of dependence, overdose, constipation, and respiratory depression, guidelines recommend using them only briefly and with close supervision. FDA Access Data+2FDA Access Data+2

12. Serotonin-Norepinephrine Reuptake Inhibitors Other Than Duloxetine (e.g., Venlafaxine)
Venlafaxine and similar drugs are sometimes used off-label for neuropathic pain. They raise serotonin and norepinephrine levels and can help both pain and mood. Doses must be set by a physician and taken regularly. Side effects can include nausea, increased blood pressure, and withdrawal symptoms if stopped suddenly. Texas Health and Human Services+1

13. Selective Serotonin Reuptake Inhibitors (SSRIs) for Mood Support
People with chronic CMT pain may develop depression or anxiety. SSRIs such as sertraline or escitalopram can improve mood and make pain easier to cope with, though they are not strong neuropathic pain drugs. They modulate serotonin levels in the brain. Side effects vary but may include nausea, sexual dysfunction, or sleep changes. FDA Access Data+1

14. Sleep Medicines (Short-Term for Severe Insomnia)
Sedating antihistamines or short-acting prescription sleep medicines may be used briefly when pain or cramps disrupt sleep. Better sleep can reduce daytime fatigue and improve coping. Because of risks like dependence, confusion, and falls, these drugs are used in the lowest effective dose and only under medical guidance. Mayo Clinic+1

15. Alpha-Lipoic-Acid-Related Formulations (Where Used as “Medicinal Products”)
In some regions, alpha-lipoic acid is used as a drug-like product for neuropathy. It is an antioxidant that may support nerve metabolism and reduce oxidative stress. Evidence in hereditary neuropathy is limited, but some data from diabetic neuropathy suggest small benefits in symptoms. Side effects are usually mild gastrointestinal upset. PMC+1

16. Vitamin B12 Injections (When Deficient)
If blood tests reveal vitamin B12 deficiency, injections or high-dose oral forms can correct it. While B12 does not cure CMT1B, correcting deficiency prevents extra nerve damage from another cause. B12 is needed for myelin formation and DNA synthesis. Side effects are rare but may include mild injection-site reactions. NCBI+1

17. Vitamin D Supplementation (When Low)
Low vitamin D is common in people with limited mobility. Supplementation helps maintain bone health, reducing fracture risk if falls occur. Vitamin D improves calcium absorption and bone mineralization. Excessive vitamin D can cause toxicity, so doses must follow doctor advice and lab monitoring. NCBI+1

18. Magnesium for Muscle Cramps (Supportive Use)
Some clinicians try oral magnesium for nocturnal cramps. It may help stabilize muscle cell membranes and relax muscle fibers in some people. Evidence is modest, but it is generally safe at recommended doses. High doses can cause diarrhea and, in kidney disease, dangerous magnesium buildup. PMC+1

19. Combination Therapy (e.g., Pregabalin Plus Duloxetine)
Studies in diabetic neuropathy show that combining a gabapentinoid with duloxetine can give extra pain relief while allowing moderate doses of each drug. Similar strategies may be adapted for CMT-related neuropathic pain in selected patients. Side effects from both classes must be watched carefully. PMC+2Zanco Journal of Medical Sciences+2

20. Clinical-Trial Medicines (Investigational Only)
Several experimental drugs and gene-targeted therapies are being studied for CMT types, focusing on myelin repair, gene silencing, or neuroprotection. These are not yet standard care. Participation in approved clinical trials at specialist centers may provide access to new treatments under strict safety rules. PMC+2JCN+2

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Dietary Molecular Supplements

Supplements should never replace prescribed medicines. Always discuss any supplement with your doctor, especially if you take many drugs.

1. Omega-3 Fatty Acids (Fish Oil)
Omega-3s (EPA and DHA) are anti-inflammatory fats from fish oil. They may support nerve cell membranes and overall cardiovascular health. Typical doses in studies are around 1–3 g/day of combined EPA/DHA, but exact dosing must be individualized. Mechanistically, they are built into nerve cell membranes and can reduce inflammatory signaling molecules. PMC+1

2. Alpha-Lipoic Acid
Alpha-lipoic acid is an antioxidant involved in mitochondrial energy production. In diabetic neuropathy, it has shown modest symptom benefits; in CMT, evidence is limited but theoretical. Doses of 300–600 mg/day are often used in studies. It works by reducing oxidative stress and helping glucose and fat metabolism inside nerve cells. Texas Health and Human Services+1

3. Acetyl-L-Carnitine
Acetyl-L-carnitine helps transport fatty acids into mitochondria for energy production. Some small trials in neuropathy suggest possible benefits for pain and nerve regeneration. Typical doses are 500–1,000 mg two or three times daily. It may support nerve metabolism and mitochondrial function, but results in hereditary neuropathies are still uncertain. PMC+1

4. Coenzyme Q10 (CoQ10)
CoQ10 is another mitochondrial cofactor that participates in the electron transport chain. In some neuromuscular disorders, it is used as supportive therapy to improve energy production and reduce oxidative stress. Doses vary (often 100–300 mg/day). It may help cells handle free radicals and improve muscle endurance, though hard evidence in CMT is limited. PMC+1

5. B-Complex Vitamins (B1, B6, B12 in Balanced Doses)
B vitamins are important for nerve conduction and myelin health. Low levels can worsen neuropathy. Balanced B-complex supplements can support general nerve nutrition, but excessive B6 can itself cause nerve damage, so dosing must follow medical advice. Their mechanism is to act as co-factors in energy and neurotransmitter pathways. NCBI+1

6. Vitamin D with Calcium (If Deficient)
In people with low vitamin D, supplementation helps maintain strong bones and reduces fracture risk after falls. Usual daily doses depend on baseline blood levels. Vitamin D improves calcium absorption and bone mineralization; calcium gives the raw material for bone. Together, they protect the skeleton in people with weak muscles and deformities. NCBI+1

7. Vitamin E
Vitamin E is a fat-soluble antioxidant that protects cell membranes from oxidative damage. In specific vitamin-E-deficiency neuropathies, it can be life-changing; in CMT1B, it is more of a general antioxidant. Doses must stay within safe limits because very high doses can increase bleeding risk. It works by breaking free-radical chains in lipid membranes. NCBI+1

8. Curcumin (Turmeric Extract)
Curcumin has anti-inflammatory and antioxidant properties. Experimental studies suggest it may modulate inflammatory pathways and oxidative stress, which could indirectly support nerve health. Typical supplement doses are a few hundred milligrams per day, often with piperine to increase absorption. Human evidence in CMT is not strong, so it is considered supportive only. PMC+1

9. Resveratrol
Resveratrol is a plant polyphenol studied for its potential to activate cellular stress-response pathways and improve mitochondrial function. Animal studies show neuroprotective effects in some models. Human dosing varies widely, and evidence is preliminary. In theory, it may protect nerve cells from oxidative and inflammatory damage. PMC+1

10. Probiotics (Gut Microbiome Support)
Probiotics can support gut health, which may influence systemic inflammation and nutrient absorption. There is no direct CMT1B proof, but good gut function helps overall health, especially if many medicines are taken. Doses are given as colony-forming units (CFU) and depend on the product. Mechanistically, probiotics modulate immune responses and improve barrier function in the gut. PMC+1

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Immunity Booster / Regenerative / Stem Cell”–Type Drugs

There are no approved stem cell drugs or gene therapies for CMT1B in routine practice. The items below describe research directions, not standard treatments.

1. Experimental Gene Therapy Targeting MPZ
Research groups are exploring viral vectors and gene-editing tools to correct or silence harmful MPZ mutations that cause CMT1B. The idea is to deliver a healthy gene or repair the faulty one in Schwann cells. Early studies are mostly in animals, and any human use is strictly inside approved clinical trials with careful safety monitoring. PMC+2JCN+2

2. Neurotrophin-Based Approaches (e.g., NT-3 in Models)
Neurotrophins like nerve growth factor and neurotrophin-3 have been studied in CMT animal models to promote nerve regeneration and remyelination. These treatments aim to increase survival and function of nerve cells and Schwann cells. Side effects and delivery challenges have limited clinical use so far, and they remain experimental. PMC+1

3. Small Molecules That Improve Myelin Folding and Trafficking
Some compounds are being tested to help misfolded myelin proteins fold correctly or be degraded safely, reducing stress in Schwann cells. These “proteostasis” drugs could, in theory, slow demyelination caused by MPZ mutations. At present, they are at pre-clinical or early-phase trial stages and not standard of care. PMC+2JCN+2

4. Antioxidant “Drug-Like” Therapies (High-Grade CoQ10, ALA)
High-grade antioxidant formulations, sometimes treated more like medicines than supplements, aim to reduce oxidative damage in nerves and muscles. By lowering free radicals, they may protect mitochondria and myelin. Clinical evidence in hereditary neuropathies is still limited, so they are considered supportive and experimental. Texas Health and Human Services+2Government of British Columbia+2

5. Stem Cell–Based Experimental Therapies
Experimental work is ongoing using mesenchymal stem cells or Schwann cell precursors to support nerve repair or deliver helpful factors. These approaches try to provide new supporting cells or growth factors to damaged nerves. At present, stem cell therapy for CMT should only be done in regulated trials; commercial “stem cell clinics” without evidence can be risky. PMC+2JCN+2

6. Immunomodulatory Approaches (Only for Overlapping Conditions)
CMT1B itself is not an immune disease, but if a person also has an immune-mediated neuropathy or inflammatory condition, drugs like IVIG, steroids, or other immunotherapies may be used. These drugs alter immune responses and may reduce secondary inflammatory damage. They must be prescribed by specialists because of serious side effects. PMC+1

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Surgeries (Procedures and Why They Are Done)

1. Tendon Transfer Surgery
In tendon transfer, stronger tendons are moved to replace the function of weakened muscles, such as moving the tibialis posterior to help lift the foot and reduce high-arch deformity. It is done when muscle imbalance causes severe foot drop and cavus (high arch). The goal is to rebalance forces and improve walking mechanics. PubMed+3Charcot-Marie-Tooth Association+3Charcot-Marie-Tooth Disease+3

2. Osteotomy (Bone Cutting and Realignment)
Osteotomy reshapes or repositions bones in the foot (for example, metatarsals or heel bone) to correct deformities. It is done when the foot becomes rigid, painful, and unstable despite braces. By changing bone angles, the surgeon creates a more plantigrade (flat, stable) foot for standing and walking. Charcot-Marie-Tooth Association+2ENMC+2

3. Soft-Tissue Release and Lengthening
Surgeons may lengthen tight tendons (like Achilles) or release contracted ligaments in the foot. This is done when tight soft tissue prevents the foot from being placed flat or when toes claw severely. The procedure reduces deforming forces and allows better positioning of the foot and toes. Charcot-Marie-Tooth Association+2Charcot-Marie-Tooth Disease+2

4. Toe Straightening Procedures
Claw toes and hammer toes can be corrected with tendon balancing, bone trimming, or joint fusion in the toes. This is done when toes cause pain, corns, or difficulty fitting shoes. The goal is to align toes, reduce pressure points, and improve comfort and balance in shoes. Charcot-Marie-Tooth Disease+2ENMC+2

5. Arthrodesis (Joint Fusion) in Severe Deformity
In very advanced, rigid deformity, some joints in the foot or ankle may be fused to create a stable, pain-free structure. Fusion removes joint motion but improves stability. It is done when other operations and braces cannot give enough stability or when arthritis is severe. ENMC+2NMD Journal+2

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Key Preventions and Protective Strategies

Because CMT1B is genetic, we cannot “prevent” the disease itself, but we can prevent complications:

1. Avoid very tight, poorly fitting shoes that cause pressure sores or deform toes. Nilakantha Brain Clinic+1

2. Do daily stretching of calves and feet to delay contractures and maintain flexibility. Physiopedia+1

3. Use braces, inserts, or mobility aids early instead of waiting for repeated falls. PMC+1

4. Keep body weight in a healthy range to reduce stress on weak feet and ankles. PMC+1

5. Check feet daily for cuts, blisters, or color changes, especially if feeling is reduced. ScienceDirect+1

6. Treat infections and minor injuries early, especially on the feet, to avoid ulcers. ScienceDirect+1

7. Stay physically active within safe limits to maintain strength and bone density. MDPI+1

8. Avoid excessive alcohol or toxic drugs that may cause extra nerve damage. NCBI+1

9. Attend regular follow-ups with neurologist, orthopaedic surgeon, and therapists to adjust braces, exercises, and medicines. PMC+1

10. Offer genetic counseling in families to understand inheritance and reproductive options. NCBI+1

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When to See Doctors

You should see a doctor (ideally a neurologist experienced in neuromuscular diseases) if you or a family member:

• Notice progressive foot deformity, such as increasing high arches, claw toes, or frequent ankle sprains. NCBI+1

• Have worsening weakness or wasting in the legs or hands, or difficulty with buttons, pens, or keys. NCBI+1

• Experience new or severe burning, electric, or shooting pain in feet or hands that affects sleep. Mayo Clinic+1

• Develop frequent falls, balance problems, or difficulty walking even with braces. MDPI+1

• See open sores, color changes, or swelling in the feet that do not improve quickly. ScienceDirect+1

• Have mood changes, anxiety, or depression related to living with CMT. Mayo Clinic+1

Emergency care is needed if there is a severe fall with possible fracture, sudden loss of ability to walk, or serious infection in the foot. PMC+1

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What to Eat and What to Avoid

There is no special “CMT1B diet”, but healthy food supports muscles, nerves, and bones.

Foods to Prefer (What to Eat)

1. Colorful vegetables and fruits – provide vitamins, minerals, and antioxidants that help protect cells from oxidative stress. PMC+1

2. Lean proteins (fish, poultry, beans, lentils) – supply amino acids for muscle repair and immune function. PMC+1

3. Whole grains (oats, brown rice, whole-wheat bread) – give slow energy, fiber, and B vitamins for nerve health. NCBI+1

4. Healthy fats (olive oil, avocados, nuts, seeds) – support cell membranes and help absorb fat-soluble vitamins. PMC+1

5. Calcium and vitamin-D-rich foods (dairy or fortified alternatives, small fish with bones) – strengthen bones, lowering fracture risk. PMC+1

Foods to Limit or Avoid

6. Sugary drinks and sweets – can cause weight gain, which increases stress on weak feet and joints. NCBI+1

7. Highly processed fast food and trans fats – may raise inflammation and cardiovascular risk. Texas Health and Human Services+1

8. Excessive salt – can worsen blood pressure and swelling, especially if mobility is limited. Texas Health and Human Services+1

9. Heavy alcohol use – alcohol can directly damage nerves and worsen neuropathy. NCBI+1

10. Crash diets or extreme restriction – can lead to nutrient deficiencies that further harm nerves and muscles. NCBI+1

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Frequently Asked Questions (FAQs)

1. Is Charcot-Marie-Tooth disease type 1B curable?
No. At present there is no cure for CMT1B. It is a lifelong genetic condition. However, many people live full lives with the help of physical therapy, orthotics, pain management, and sometimes surgery. Research into gene-based and regenerative treatments is active and continues to grow. NCBI+2PMC+2

2. How is CMT1B different from other CMT types?
CMT1B is usually caused by mutations in the MPZ gene that affect myelin in peripheral nerves. Other types are linked to different genes such as PMP22 or MFN2. Symptoms can be similar, but age at onset and severity vary. Genetic testing helps confirm the exact type. NCBI+2www.elsevier.com+2

3. Can exercise make CMT1B worse?
Appropriate, supervised exercise usually helps rather than harms. Over-exertion that causes repeated injuries should be avoided, but tailored stretching, strengthening, and aerobic activity are recommended to maintain function. A physical therapist familiar with neuromuscular disease should guide the plan. Physiopedia+2MDPI+2

4. Will I end up in a wheelchair?
Many people with CMT1B never need a wheelchair full-time, especially with early braces and therapy. Others may use a wheelchair or scooter for long distances to save energy and safety. The course varies by person and mutation. Early rehabilitation and good orthopaedic care can delay severe disability. NCBI+2PMC+2

5. Can children with CMT1B play sports?
Children can often take part in safe, low-impact sports like swimming or cycling, depending on their strength and balance. Contact or high-impact sports may increase injury risk. A pediatric neurologist and physiotherapist should help choose activities and protective braces as needed. MDPI+2NCBI+2

6. Why do I have high arches and claw toes?
In CMT1B, some muscles become weak while others stay stronger, pulling unevenly on the bones. Over time this imbalance lifts the arch and curls the toes. Early use of braces, stretching, and sometimes surgery helps correct or stabilize these deformities. NCBI+2Charcot-Marie-Tooth Association+2

7. What tests are used to diagnose CMT1B?
Doctors may use nerve conduction studies, electromyography (EMG), genetic testing for MPZ and other genes, and a clinical exam of strength, sensation, and foot shape. Genetic testing confirms the exact mutation and helps with family counseling. NCBI+2www.elsevier.com+2

8. Are pain medicines always needed?
Not everyone with CMT1B has severe pain. Some have mainly weakness and numbness. When pain is significant, medicines like pregabalin, gabapentin, or duloxetine may be used along with non-drug therapies, and doses can be adjusted over time. Clinical Actionability+2PMC+2

9. Do neuropathic pain drugs cause addiction?
Gabapentin and pregabalin are not classic opioids, but they still can be misused, especially at high doses or with other sedating drugs. Tramadol and stronger opioids clearly carry addiction and overdose risks. That is why doctors start with non-opioid options and monitor patients carefully. FDA Access Data+3HPSJ/MVHP+3Texas Health and Human Services+3

10. Can CMT1B affect my hands?
Yes. Although symptoms often start in the feet and legs, weakness and wasting can later involve the hands. People may notice problems with fine tasks like buttoning, writing, or using smartphones. Hand therapy, splints, and adaptive devices can help maintain independence. NCBI+2PubMed+2

11. Is pregnancy safe if I have CMT1B?
Many people with CMT have successful pregnancies. However, pregnancy may temporarily increase weakness or balance problems. Genetic counseling is important to discuss inheritance risk for the baby. Obstetric and neuromuscular teams can plan safe delivery and anesthesia. NCBI+2www.elsevier.com+2

12. Should family members be tested?
In autosomal-dominant CMT1B, children of an affected person have a 50% chance of inheriting the mutation. Family testing can be considered for adults who want to know their status, especially for life planning or early rehab. Decisions are personal and supported by genetic counseling. NCBI+2www.elsevier.com+2

13. Is stem cell therapy available now?
At present, stem cell therapy for CMT1B remains experimental and is only appropriate inside regulated clinical trials. Commercial clinics offering unproven stem cell treatments without strong evidence should be approached with extreme caution because of possible risks and high costs. PMC+2JCN+2

14. How often should I see my neurologist?
This depends on the severity and speed of progression. Many people benefit from yearly reviews, with more frequent visits if pain changes, falls increase, or surgery is being considered. Regular follow-up allows early adjustments in braces, medicines, and therapy plans. PMC+2Clinical Actionability+2

15. What is the most important thing I can do today?
The most helpful steps for many people with CMT1B are: start or continue guided physical therapy, use appropriate braces or footwear, maintain a healthy weight and active lifestyle, protect the feet, and stay connected with a neuromuscular care team. These actions do not cure CMT but strongly influence long-term comfort and independence. Clinical Actionability+3PMC+3ScienceDirect+3

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 24, 2025.