Charcot-Marie-Tooth disease type 2 caused by mutation in HSPB8 is a rare inherited nerve disease. It affects the long nerves that go from the spinal cord to the feet and hands. These nerves are called peripheral motor and sensory nerves. In this disease, the main problem is in the axon, the long “wire-like” part of the nerve that carries signals. This is why it is called a type 2 (axonal) Charcot-Marie-Tooth disease. MalaCards+1
Charcot–Marie–Tooth disease type 2 caused by mutation in the HSPB8 gene is a rare inherited nerve disease. Doctors often call it CMT2L. It mainly affects the long nerves that go to the feet, legs, hands, and arms. The nerves slowly become weak and cannot send signals properly. Because of this, muscles become weak and thin, especially in the feet and lower legs. People may have high-arched feet, foot drop, difficulty walking, and sometimes hand weakness. The disease usually starts in teenage or adult life and gets worse slowly over many years. It is caused by a change (mutation) in the HSPB8 gene, which makes a small heat-shock protein important for keeping muscle and nerve proteins healthy. MedlinePlus+3PMC+3
The HSPB8 gene gives instructions to make a small heat-shock protein called heat shock protein beta-8. This protein helps protect nerve cells when they are under stress, such as heat, toxins, or inflammation. When HSPB8 has a harmful change (mutation), the protein does not work well. The nerve cells cannot handle stress normally, and over time the axons are damaged and slowly die back. This causes weakness, wasting of muscles, and loss of feeling in the feet, legs, hands, and sometimes arms. MedlinePlus+1
This specific form is often called axonal Charcot-Marie-Tooth disease type 2L (CMT2L). It is usually autosomal dominant, which means a person can get the disease when only one copy of the HSPB8 gene in each cell has a mutation. Most people develop symptoms in their teens or young adult years, and the disease usually worsens slowly over many years. MalaCards+1
Other names and types
Doctors and scientists use several other names for this condition. These names often refer to the same or very closely related HSPB8-related disorders: MalaCards+2E2G+2
Charcot-Marie-Tooth disease axonal type 2L (CMT2L)
Charcot-Marie-Tooth disease type 2 caused by mutation in HSPB8
Autosomal dominant Charcot-Marie-Tooth disease type 2L
Autosomal dominant axonal Charcot-Marie-Tooth disease type 2L
Charcot-Marie-Tooth neuropathy axonal type 2L
Hereditary motor and sensory neuropathy type 2L
HSPB8 Charcot-Marie-Tooth disease type 2
HSPB8-related axonal neuropathy
HSPB8 mutations can also cause closely related conditions such as distal hereditary motor neuropathy type II (dHMN II). In that form, mainly the motor (movement) nerves are affected and sensation is less involved. Because of this overlap, some patients are described as having “HSPB8-related distal motor neuropathy” rather than classic CMT2L, even though the same gene is involved. MedlinePlus+2PanelApp+2
Doctors sometimes group HSPB8-related disease into “types” based on main features:
Predominantly sensorimotor CMT2L – both movement and feeling are affected.
Predominantly motor neuropathy (dHMN) – mostly muscle weakness with little sensory loss.
Neuropathy with myopathy – some people also develop a muscle disease with “rimmed vacuoles” seen on muscle biopsy. PMC+1
Causes
For this disease, there is one root cause: a harmful mutation in the HSPB8 gene. All the “causes” below are different ways this gene change appears or different biological effects that flow from it.
1. Pathogenic missense mutations in HSPB8
Many patients have a missense mutation, where one “letter” of DNA in HSPB8 is changed. This leads to a change in a single amino acid of the HSPB8 protein. Famous examples include mutations at position Lys141. Even this small change is enough to disturb how the protein folds and works, leading to axonal neuropathy. ScienceDirect+1
2. Frameshift or truncating HSPB8 mutations
Some patients have frameshift mutations that shorten the HSPB8 protein or change its tail. These abnormal proteins may be unstable or behave in a toxic way, affecting not only nerves but sometimes also skeletal muscle and possibly heart muscle in newer reports. Nature+1
3. Autosomal dominant inheritance of a mutant HSPB8 copy
Most people with CMT2L inherit one mutated copy of HSPB8 from a parent who also has the disease. Because the disorder is autosomal dominant, this single altered gene copy is enough to cause disease, even though the other copy is normal. MalaCards+1
4. De novo (new) HSPB8 mutation in the patient
In some cases, the HSPB8 mutation is not present in either parent. It appears “de novo,” meaning it is a new change that happened in the egg, sperm, or early embryo. The child then has CMT2L even though the family history was negative before. NCBI+1
5. Loss of normal chaperone function of HSPB8
HSPB8 is a chaperone protein that helps other proteins fold correctly and prevents them from clumping when cells are stressed. When HSPB8 is mutated, its chaperone function is reduced. Mis-folded proteins can then build up inside motor neurons, making them more likely to malfunction and die. MedlinePlus+1
6. Toxic protein aggregates inside motor neurons
Mutant HSPB8 tends to form abnormal clumps (aggregates) with itself or with other proteins. These clumps are toxic to cells. They can crowd the inside of the neuron, block normal transport, and disturb many cell processes. Over time, this toxicity contributes to axon degeneration. PubMed+1
7. Impaired autophagy (cell “clean-up” system)
HSPB8 helps control autophagy, the process in which cells remove damaged proteins and organelles. Mutant HSPB8 reduces this clean-up activity. As waste proteins pile up, motor neurons become stressed and more vulnerable to injury, which promotes slowly progressive neuropathy. PubMed+1
8. Increased vulnerability to cellular stress
Because HSPB8 is a heat-shock protein, it is especially important when cells are under stress (e.g., oxidative stress, toxins, fever, inflammation). When HSPB8 is abnormal, neurons cannot respond properly to these stresses. This extra vulnerability speeds up nerve damage over years. MedlinePlus+1
9. Length-dependent axonal degeneration
The longest nerves are the most sensitive to damage. In CMT2L, axons to the feet and lower legs are usually affected first and most severely. Damage spreads upward over time, and later the long nerves to the hands may be affected. This “length-dependent” pattern is typical of axonal CMT and explains why symptoms start in the feet. MalaCards+1
10. Disruption of motor neuron–muscle connection (neuromuscular junction)
When axons degenerate, the neuromuscular junction, the place where nerve meets muscle, stops working. Muscles do not receive proper signals to contract, so they become weak and then shrink (atrophy). This contributes to foot drop, thin lower legs, and weak hands. MalaCards+1
11. Secondary changes in sensory nerve axons
In many people with CMT2L, sensory axons (nerves for touch, pain, and vibration) are also affected, not only motor axons. This leads to numbness and reduced sensation in the feet and sometimes hands. The same HSPB8 mutation damages both motor and sensory axons, so both systems can be involved. MalaCards+1
12. Modifying variants in other nerve-related genes
Some people may carry minor variants in other nerve genes. These extra changes do not cause disease by themselves but can modify how severe the HSPB8-related neuropathy becomes, or change the age of onset. This is suggested by the wide range of severity even within the same HSPB8 family. NCBI+1
13. Cellular energy stress in nerves
Long axons need a lot of energy to maintain their membranes and transport materials. Protein clumps, weak autophagy, and continuous stress can harm mitochondria and energy production, making axons fail earlier. This energy stress is a general mechanism in many inherited axonal neuropathies, including HSPB8-related disease. MDPI+1
14. Age-related accumulation of damage
CMT2L usually appears in adolescence or early adulthood and worsens slowly. As a person ages, small amounts of damage add up in already vulnerable HSPB8-mutant neurons. Over decades, this accumulation leads to noticeable weakness, deformities, and disability. MalaCards+1
15. Physical overuse or repeated micro-trauma
Heavy physical stress on already fragile nerves and muscles (for example, repeated ankle sprains, long-distance running without support) may not cause the disease, but can bring out symptoms earlier or make them worse, especially in people with foot deformities. NCBI+1
16. Certain toxic medications as additional stress
Some drugs that are toxic to peripheral nerves, such as the chemotherapy drug vincristine, can cause unusually severe nerve damage in people with pre-existing CMT2. Although data are more general for CMT2, the same concern likely applies to HSPB8-related CMT2L. NCBI+1
17. Metabolic or nutritional stressors
Poor control of diabetes, long-term alcohol misuse, or severe vitamin deficiencies can harm peripheral nerves by themselves. In someone with an HSPB8 mutation, these factors can further weaken axons, making symptoms more severe than they would otherwise be. NCBI+1
18. Co-existing muscle disease due to HSPB8
Some mutations in HSPB8 cause a combination of neuropathy and myopathy. In these people, not only nerves but also muscles are directly diseased. This “dual hit” amplifies weakness and disability. PMC+1
19. Impaired cell signaling pathways
HSPB8 interacts with several cell signaling proteins. Mutations can disturb pathways that control cell survival, stress response, and protein quality control. Over time, these signaling problems push motor neurons towards dysfunction and death. MDPI+1
20. Possible broader tissue involvement (heart and other muscles)
Newer studies suggest that some frameshift HSPB8 mutations may also harm heart muscle and other striated muscles, although this is still being studied. This broader tissue involvement may partly explain more severe or unusual disease in some families. Nature+1
Symptoms
1. Slowly progressive weakness in the feet and lower legs
The earliest and most common symptom is weakness in the feet and ankles. People may notice that they trip easily, cannot run as they used to, or their feet feel heavy. This weakness slowly gets worse over years. MalaCards+1
2. Foot drop and tripping
Because the muscles that lift the front of the foot become weak, the toes may drag on the ground. This is called foot drop. People often trip on small obstacles or need to lift their knees higher when walking to clear the toes. MalaCards+1
3. High-arched feet (pes cavus)
Many people develop high-arched feet, known as pes cavus. The arch of the foot becomes very high and the toes may curl (hammer toes). This is caused by imbalance between weak and relatively stronger muscles. Pes cavus is a classic sign of inherited neuropathies such as CMT2L. MalaCards+1
4. Thin lower legs (“stork legs”)
As the muscles of the lower legs shrink due to nerve damage, the calves become thin. This can give a “stork-like” appearance, where the legs are skinny below the knees. The change is usually symmetric in both legs. NCBI+1
5. Distal sensory loss in the feet
Many people lose feeling in the toes and soles of the feet. They may not feel light touch, temperature, or vibration as well as before. Sometimes they only notice this when they hurt their feet and did not feel the injury. MalaCards+1
6. Balance problems and unsteady walking
Because of both weakness and loss of sensation, balance becomes harder. People may feel unsteady in the dark or on uneven ground. They may sway when standing with eyes closed, and they may need to hold on to rails or furniture. NCBI+1
7. Reduced or absent ankle reflexes
On examination, doctors often find that ankle reflexes (Achilles tendon reflex) are weak or absent. Knee reflexes may also be reduced. This is a common sign of peripheral neuropathy affecting long sensory-motor pathways. MalaCards+1
8. Weakness in the hands and distal arms
As the disease progresses, it may also affect the hands. People can find it hard to grip objects, open jars, button clothes, or write for long periods. The small muscles between the fingers may waste away. MalaCards+1
9. Muscle cramps and fatigue
Some people experience muscle cramps, especially in the feet and calves. Walking long distances or standing for a long time may be tiring. Fatigue can come both from weak muscles and from the extra effort needed to keep balance. NCBI+1
10. Numbness, tingling, or burning pain
In some patients, damaged sensory nerves cause tingling, pins-and-needles, or burning pain in the feet and sometimes the hands. Others feel mainly numbness. The type and amount of pain varies but can affect quality of life. NCBI+1
11. Clumsiness and frequent ankle sprains
Because of foot drop, poor balance, and high-arched feet, people may seem clumsy. They may twist their ankles easily and have repeated ankle sprains. Shoes may wear out in unusual places due to abnormal gait. MalaCards+1
12. Difficulty running and climbing stairs
Running, jumping, and climbing stairs need strong ankle and foot muscles. People with CMT2L often notice problems with sports in school or early adult life, long before they see a doctor for diagnosis. MalaCards+1
13. Proximal lower limb weakness in advanced stages
In more advanced cases, weakness may move up from the feet to the muscles around the knees and hips. Walking long distances becomes harder, and some people may eventually need a cane, braces, or other aids. MalaCards+1
14. Hand deformities in some cases
When hand muscles are weak for a long time, fingers can become thin, and there may be mild hand deformities such as clawing of fingers. Fine motor tasks like typing or sewing become more difficult. NCBI+1
15. Very slow overall progression
A key feature of CMT2L is that it usually progresses slowly. Many people remain able to walk for decades and adapt to their symptoms with braces, physiotherapy, and lifestyle changes. Life expectancy is typically normal, although disability can still be significant. MalaCards+1
Diagnostic tests
1. Detailed medical and family history (physical/clinical assessment)
The doctor first asks about age at onset, how symptoms have changed, and whether other family members have similar problems. A positive family history with autosomal dominant pattern (affected parent and child in several generations) strongly suggests inherited neuropathy like HSPB8-related CMT2L. NCBI+1
2. General neurological examination (physical exam)
A full neurological exam checks muscle strength, tendon reflexes, sensation, coordination, and gait. Typical findings in CMT2L are distal weakness, reduced reflexes, distal sensory loss, and high-arched feet. These signs help the doctor suspect a length-dependent axonal neuropathy. NCBI+1
3. Manual muscle testing of feet and hands (manual test)
The doctor or physiotherapist may use manual muscle testing, pressing against the patient’s movements to grade strength in specific muscles (for example ankle dorsiflexion, toe extension, finger spreading). This shows which muscle groups are most affected and helps follow progression over time. NCBI+1
4. Sensory testing with simple tools (manual test)
Simple tools such as a tuning fork, cotton wool, safety pin, and monofilament are used to test vibration, light touch, pain, and pressure. In CMT2L, there is often reduced vibration and light touch in the toes and feet, with a “stocking” pattern of sensory loss. NCBI+1
5. Gait and balance tests, including Romberg (manual test)
The doctor watches how the person walks, turns, and stands on heels or toes. Tests like Romberg’s test (standing with feet together and eyes closed) and heel-to-toe walking show problems with balance and coordination that result from sensory and motor neuropathy. NCBI+1
6. Reflex testing with a reflex hammer (physical exam)
Using a reflex hammer, the doctor checks ankle, knee, and other tendon reflexes. In CMT2L, ankle reflexes are often absent or greatly reduced. This helps distinguish peripheral neuropathy from disorders that affect the brain or spinal cord. NCBI+1
7. Nerve conduction studies (NCS) (electrodiagnostic test)
Nerve conduction studies measure how fast and how strongly electrical signals move along peripheral nerves. In axonal CMT (type 2), conduction velocities are normal or only slightly slow, but the amplitude (size) of the signal is reduced, showing loss of axons. This pattern supports a diagnosis of CMT2L rather than demyelinating forms. NCBI+1
8. Electromyography (EMG) (electrodiagnostic test)
EMG uses a small needle electrode to record electrical activity inside muscles. In CMT2L, EMG shows signs of chronic denervation and re-innervation, meaning motor units have been lost and surviving axons are trying to take over. EMG helps confirm that weakness is due to neuropathy rather than primary muscle disease alone. NCBI
9. Quantitative sensory testing (QST) (electrodiagnostic/physiologic test)
In some centers, QST is used to measure thresholds for detecting warmth, cold, vibration, and pain using special devices. This gives more precise information about small and large nerve fiber function and can track changes over time in inherited neuropathies. NCBI+1
10. Routine blood tests to exclude acquired causes (lab/pathological tests)
Although CMT2L is genetic, doctors usually test blood for diabetes, vitamin B12, thyroid problems, kidney and liver function, and autoimmune markers. This helps rule out other treatable causes of neuropathy that could exist alongside or instead of HSPB8-related disease. NCBI+1
11. Comprehensive CMT genetic panel (lab/pathological test)
Many laboratories offer next-generation sequencing panels for CMT that include dozens of neuropathy genes, including HSPB8. This test looks for known and new mutations in many genes at once. When it finds a likely pathogenic HSPB8 variant in a person with a fitting clinical picture, the diagnosis of CMT2L is strongly supported. NCBI+2invitae.com+2
12. Targeted HSPB8 gene sequencing or exome/genome sequencing (lab/pathological test)
If panel testing is not available or is negative but suspicion remains, doctors may order targeted sequencing of HSPB8, or broader tests like exome or genome sequencing. These tests can detect rare or new HSPB8 variants, including missense and frameshift changes. MedlinePlus+1
13. Segregation testing in family members (lab/genetic test)
Once a pathogenic HSPB8 variant is found, testing relatives shows whether the mutation tracks with disease in the family. If all affected members carry the variant and all unaffected adults do not, this strengthens the evidence that this mutation is the cause. NCBI+1
14. Nerve biopsy (lab/pathological test)
Nerve biopsy is now used less often, but in uncertain cases, a small piece of a sensory nerve (usually from the ankle) can be removed and examined under a microscope. In axonal CMT, the biopsy shows loss of axons with little demyelination. For HSPB8-related disease, genetic testing has largely replaced this invasive test. NCBI+1
15. Muscle biopsy (lab/pathological test)
In people with both neuropathy and suspected muscle disease, a muscle biopsy may be done. HSPB8 mutations can cause a rimmed vacuolar myopathy, where muscle fibers show characteristic vacuoles and protein aggregates. This supports a diagnosis of HSPB8-related neuromyopathy. PMC+1
16. MRI of spine and peripheral nerves (imaging test)
Magnetic resonance imaging (MRI) of the spine and sometimes of nerve roots or plexuses can help rule out other causes of neuropathy, such as nerve compression or inflammatory disease. MRI can also show muscle atrophy and fatty replacement in affected limbs, which is consistent with chronic neuropathy. NCBI+1
17. Ultrasound of peripheral nerves (imaging test)
Neuromuscular ultrasound uses sound waves to look at peripheral nerves. In some forms of CMT, nerves appear enlarged. In CMT2L, the changes may be more subtle, but ultrasound can still support the diagnosis and help differentiate inherited from acquired neuropathies. NCBI+1
18. Foot and ankle X-rays (imaging test)
X-rays of the feet and ankles can document pes cavus, claw toes, and other bone deformities. These images are useful for planning orthotics or surgery and for tracking skeletal changes related to long-standing neuropathy. NCBI+1
19. Functional disability scales specific to CMT (clinical assessment)
Scales such as the Charcot-Marie-Tooth Neuropathy Score (CMTNS) or pediatric versions rate symptoms, exam findings, and nerve conduction results. They are not tests of the gene itself but are important tools for measuring how severe the disease is and how it changes over time. NCBI+1
20. Cardiac and respiratory evaluations when needed (additional tests)
For most people with classic CMT2L, heart and breathing muscles are not seriously affected. However, in some HSPB8 mutation types that also involve myopathy, doctors may order echocardiograms, ECGs, or lung function tests to check for hidden heart or breathing problems, especially when there is fatigue, breathlessness, or new research suggesting broader HSPB8 involvement. Nature+1
Non-Pharmacological Treatments
1. Physical Therapy (Physiotherapy)
Physical therapy is a key treatment for CMT2 with HSPB8 mutation. A physical therapist teaches safe exercises to keep muscles strong and flexible, improve balance, and protect joints. The main purpose is to slow muscle weakness, prevent stiffness (contractures), and reduce the chance of falls. The therapist usually uses low-impact exercises like stretching, gentle strengthening, cycling, or swimming. The basic mechanism is simple: regular movement and stretching help preserve muscle fibers, maintain range of motion in joints, and improve blood flow to nerves and muscles, which can help daily walking and standing feel easier. HNF Cure+3Mayo Clinic+3Muscular Dystrophy Association+3
2. Occupational Therapy
Occupational therapy helps people do everyday tasks such as dressing, writing, cooking, and using a computer. The purpose is to keep independence in school, work, and home life. The therapist may suggest special grips for pens, adapted keyboards, or tools with larger handles to make weak hands work more easily. The mechanism is to adapt the task or the tool so that less muscle force is needed. This reduces fatigue, prevents strain injuries, and helps the person stay active and productive even when hand muscles are weak. Charcot-Marie-Tooth Association+1
3. Ankle–Foot Orthoses (AFOs) and Braces
AFOs are plastic or carbon-fiber braces worn in the shoes and around the lower legs. The purpose is to control foot drop, improve foot position, and make walking safer and smoother. They work by holding the ankle in a more neutral position so the toes do not drag on the ground. This simple mechanical support reduces tripping, saves energy when walking, and may delay joint deformities. In CMT, many guidelines see AFOs as one of the most important aids to keep people mobile for many years. PMC+3Mayo Clinic+3Muscular Dystrophy Association+3
4. Custom Footwear and Insoles
Custom shoes and insoles support high-arched feet and clawed toes, which are common in CMT2. The purpose is to spread pressure more evenly under the foot, reduce pain, and prevent skin sores and calluses. The mechanism is mechanical: the insole fills the gaps under the arch and supports weak muscles, while the shoe stabilizes the ankle. This can improve walking pattern, decrease pain, and reduce the risk of foot ulcers and deformity getting worse. Mayo Clinic+2nhs.uk+2
5. Stretching Programs
Daily stretching of calf muscles, hamstrings, feet, and sometimes hands is often recommended. The purpose is to prevent or delay fixed tightness in muscles and tendons (contractures) that can lock joints in poor positions. The mechanism is that gentle, regular stretch signals the muscle–tendon unit to remain longer and more flexible. This helps keep ankles and toes moving better, supports balance, and makes braces and shoes more comfortable. Muscular Dystrophy Association+2nhs.uk+2
6. Strength Training with Low Resistance
Carefully planned strength training targets muscles that are not yet severely damaged. The purpose is to preserve strength and delay disability. Exercises use light weights, resistance bands, or body weight. The mechanism is that mild overload encourages surviving muscle fibers to grow stronger. It must be supervised, because too much load on very weak muscles might cause overuse injury or fatigue. Done correctly, it improves walking endurance and helps with stair climbing and transfers. PMC+1
7. Balance and Gait Training
Balance training includes standing on different surfaces, walking with head turns, or practicing quick direction changes in a safe way. The purpose is to reduce falls and build confidence in walking. The mechanism is neural and mechanical: repeating these tasks helps the brain and remaining nerves coordinate movements better, and strengthens core and leg muscles that keep the body upright. Often therapists combine this with teaching safe ways to turn, stop, and get up from a fall. Muscular Dystrophy Association+2HNF Cure+2
8. Aquatic (Water) Therapy
Water therapy uses swimming pools or warm water exercises. The water supports body weight, so weak legs can move more freely. The purpose is to allow safe exercise with less pain and strain on joints and feet. The mechanism is buoyancy, which reduces the load on nerves and muscles, while the gentle water resistance gives a mild strengthening effect. For many CMT patients, water therapy is more comfortable and enjoyable than land-based exercise, which helps with long-term adherence. nhs.uk+2HNF Cure+2
9. Walking Aids (Cane, Crutches, Walker)
Canes, forearm crutches, or walkers are simple tools that give extra support. The purpose is to increase safety and independence when balance is poor or legs are very weak. The mechanism is weight sharing: some body weight is transferred from the legs into the arms through the device. This reduces the risk of falls, saves energy, and may allow longer distances without fatigue. Choosing the right device and correct height is important and should be guided by a therapist. Muscular Dystrophy Association+2Mayo Clinic+2
10. Hand Splints and Assistive Devices
Thumb splints, wrist splints, or finger supports may be used when hand weakness and deformity appear. The purpose is to improve grip, reduce pain, and prevent further joint problems. The mechanism is to hold joints in a more natural alignment so that the remaining muscles can work more efficiently. Simple assistive devices like jar openers, button hooks, or elastic shoelaces also lower the amount of force needed for daily tasks, which protects weak hand muscles from overuse. Mayo Clinic+2Charcot-Marie-Tooth Association+2
11. Orthopaedic Follow-up and Foot Care
Regular visits to an orthopaedic specialist and a podiatrist help detect problems like severe foot deformities or pressure points early. The purpose is early correction or protection before problems become permanent. The mechanism is preventive: small shoe changes, callus care, or minor procedures can avoid more serious surgery later. People with CMT2L often develop pes cavus and toe deformities, and early specialist care can slow these changes. Mayo Clinic+2Muscular Dystrophy Association+2
12. Pain Psychology and Cognitive Behavioural Therapy (CBT)
Chronic neuropathic pain and disability can cause anxiety, sadness, or poor sleep. Pain psychology and CBT teach coping skills, relaxation, and ways to change unhelpful thoughts about pain. The purpose is to improve quality of life and reduce the emotional weight of long-term illness. The mechanism is that better coping reduces stress hormones and central pain amplification, so pain feels more manageable, even if nerve damage remains. PMC+1
13. Energy-Conservation and Fatigue Management
Therapists teach planning of daily tasks, pacing, using rests, and organizing the home to avoid unnecessary steps. The purpose is to reduce fatigue and allow important activities (school, work, family time) to remain possible. The mechanism is behavioural: by spreading tasks through the day, using aids, and avoiding repeated heavy effort, the person uses less energy from weak muscles and feels less exhausted. Muscular Dystrophy Association+1
14. Home and Workplace Modifications
Simple environmental changes such as handrails, ramps, non-slip flooring, ergonomic chairs, and raised toilet seats make movement safer. At work, adjustments may include flexible hours, a suitable chair, foot rests, or speech-to-text software. The purpose is to keep the person employed or in school for as long as possible. The mechanism is that reducing physical barriers lowers the load on weak muscles and improves safety and independence. Charcot-Marie-Tooth Association+1
15. Vocational Rehabilitation
Vocational rehabilitation specialists help people find or keep jobs that match their physical abilities. The purpose is long-term participation in work and society. The mechanism is social and practical: they can suggest job changes, retraining, or adaptations, so the person does not need to leave work simply because of physical limits. PMC+1
16. Genetic Counselling
Because CMT2L is usually autosomal dominant, there is a chance it can be passed to children. Genetic counselling gives clear information about inheritance, testing options, and family planning. The purpose is to support informed choices and reduce anxiety. The mechanism is education plus emotional support; understanding the gene mutation (HSPB8) and risk helps families plan pregnancies and discuss testing in a safe and respectful way. MedlinePlus+2MalaCards+2
17. Lifestyle Measures: Sleep, Stress, and Smoking
Good sleep habits, stress reduction (breathing exercises, mindfulness), and avoiding smoking are important. The purpose is to support overall nerve and muscle health and reduce added damage. The mechanism is systemic: poor sleep and high stress increase pain and fatigue, while smoking and heavy alcohol can worsen neuropathy by damaging small blood vessels and nerves. Healthy habits may not stop the disease, but they reduce avoidable harm. PMC+1
18. Weight Management and Gentle Cardiovascular Exercise
Excess body weight puts extra load on weak feet, ankles, and knees and can increase pain and fatigue. The purpose of weight control and light aerobic exercise (walking in braces, cycling, swimming) is to improve stamina and reduce stress on joints. The mechanism is metabolic: better weight and fitness improve circulation to nerves and muscles and make daily tasks feel easier. PMC+2Muscular Dystrophy Association+2
19. Peer Support and Patient Organizations
Connecting with CMT organizations and support groups lets people share experiences and get trustworthy information. The purpose is emotional support, practical tips, and learning about research and clinical trials. The mechanism is social: feeling understood and less alone lowers anxiety and depression and helps people stick to therapy and healthy habits. HNF Cure+2PMC+2
20. Regular Follow-up in a Neuromuscular Clinic
Seeing a neurologist and multidisciplinary team regularly is itself a treatment. The purpose is to monitor progression, update braces and therapies, treat new symptoms early, and consider clinical trials. The mechanism is continuous, coordinated care, which reduces crises and complications compared with irregular visits. PMC+2Mayo Clinic+2
Drug Treatments
Very important: There is no drug approved specifically to cure CMT2 with HSPB8 mutation. Medicines are used to treat symptoms like neuropathic pain, cramps, anxiety, and sleep problems. Many of these medicines are approved by the FDA for other neuropathic pain conditions (for example, post-herpetic neuralgia or diabetic neuropathy). Doses and timing must be decided by a doctor, especially in children and teenagers. PMC+1
Below are examples of medicines often discussed in CMT-related neuropathic pain management.
1. Gabapentin
Gabapentin is an anti-seizure medicine that is also widely used to treat neuropathic pain in adults. FDA labels show it is approved for conditions such as post-herpetic neuralgia and partial seizures. FDA Access Data+2FDA Access Data+2 The purpose in CMT is to reduce burning, shooting, or tingling pain in feet and legs. It works by binding to a part of calcium channels in nerve cells, which decreases release of excitatory neurotransmitters and reduces abnormal pain signalling. Typical adult regimens start at a low dose and are slowly increased, given in divided doses during the day. Possible side effects include sleepiness, dizziness, swelling of legs, and weight gain. Any dose changes must be guided by a doctor. FDA Access Data+1
2. Pregabalin
Pregabalin is related to gabapentin and is FDA-approved for neuropathic pain states such as diabetic peripheral neuropathy and post-herpetic neuralgia. PMC The purpose in CMT is similar: to calm nerve pain and improve sleep. Its mechanism is binding to the α2δ subunit of voltage-gated calcium channels, which reduces excessive nerve firing. It is usually taken one to three times a day, starting at a low dose. Common side effects include dizziness, sleepiness, blurred vision, and weight gain. Because it can cause drowsiness, caution is needed with driving or operating machines.
3. Duloxetine
Duloxetine is a serotonin–noradrenaline reuptake inhibitor (SNRI). The FDA label lists it for diabetic peripheral neuropathic pain, fibromyalgia, and chronic musculoskeletal pain. FDA Access Data+2FDA Access Data+2 The purpose in CMT is to treat neuropathic pain and sometimes co-existing anxiety or depression. It works by increasing levels of serotonin and noradrenaline in the spinal cord, which strengthens the body’s natural pain-blocking pathways. It is usually taken once daily. Common side effects include nausea, dry mouth, sleepiness or insomnia, and sweating. It must not be stopped suddenly, and it interacts with other antidepressants, so medical supervision is essential.
4. Amitriptyline
Amitriptyline is a tricyclic antidepressant often used at low doses to treat neuropathic pain and help sleep. PMC The purpose in CMT is to reduce burning pain and improve restorative sleep at night. The mechanism is similar to SNRIs: it blocks reuptake of serotonin and noradrenaline and also reduces sodium channel activity in pain pathways. Doctors usually start at a very low night-time dose and increase slowly. Side effects can include dry mouth, constipation, blurred vision, dizziness, and weight gain; in higher doses it can affect heart rhythm, so monitoring is needed.
5. Nortriptyline
Nortriptyline is related to amitriptyline but can have slightly fewer sedating and anticholinergic effects. It is also used for neuropathic pain and chronic headache. The purpose in CMT is the same: to reduce chronic nerve pain and improve mood and sleep. The mechanism is serotonin and noradrenaline reuptake inhibition in spinal and brain pain pathways. It is usually taken once at night or twice per day, with dose adjusted slowly. Side effects include dry mouth, constipation, and dizziness, and doctors check for heart issues or drug interactions. PMC
6. Carbamazepine
Carbamazepine is an anti-seizure drug that is effective for severe neuropathic pain like trigeminal neuralgia. It is sometimes considered in difficult neuropathic pain cases, although not specific to CMT. The purpose is to reduce sharp, shock-like pain. It works by blocking voltage-gated sodium channels, stabilizing over-active nerve membranes. It is taken with meals in divided doses. Side effects include dizziness, drowsiness, low sodium, and, rarely, serious blood or skin reactions, so blood tests and monitoring are important. PMC
7. Topical Lidocaine 5% Patch
Lidocaine 5% patch is FDA-approved for post-herpetic neuralgia. PMC The purpose in neuropathic pain from CMT is to numb small areas of very painful skin, for example on the feet. The mechanism is local: lidocaine blocks sodium channels in nerve endings in the skin, so fewer pain signals are sent. Patches are placed on the painful area for a limited number of hours each day according to the label. Side effects are usually mild skin irritation or redness.
8. Topical Capsaicin
High-strength capsaicin creams or patches are used for localized neuropathic pain. Capsaicin is the active component of chili peppers. The purpose in CMT is to reduce burning pain in a small area, such as the top of the foot. The mechanism is that capsaicin over-stimulates and then temporarily depletes substance P and other pain chemicals in nerve endings, leading to a period of reduced pain. Application can cause strong burning at first, so it must be used exactly as instructed and under medical advice. PMC
9. Baclofen
Baclofen is a muscle relaxant used mainly for spasticity in conditions like multiple sclerosis, but it can sometimes help painful muscle spasms in neuropathies. The purpose in CMT is to reduce cramps and stiffness if present. It works by activating GABA-B receptors in the spinal cord, which reduces the activity of motor neurons. It is usually taken several times a day in low doses. Side effects include sleepiness, dizziness, and weakness, and sudden withdrawal can be dangerous, so any changes must be supervised. PMC
10. Simple Analgesics and NSAIDs (e.g., Paracetamol, Ibuprofen)
Paracetamol (acetaminophen) and non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen are not strong neuropathic pain drugs, but they can help with muscle, joint, or post-surgical pain in CMT. The purpose is to control mild to moderate aches that come from overuse, poor posture, or surgery, not from nerve damage itself. Their mechanism is blocking enzymes (COX) involved in pain and inflammation. Taken at standard labeled doses for short periods, they are often safe, but long-term high-dose NSAIDs can harm the stomach, kidneys, or heart, so medical guidance is still needed. PMC+1
(Many more medicines may be used depending on each person’s symptoms, but doctors always choose them case by case. In children and teens, treatment is extra careful.)
Dietary Molecular Supplements
There are no supplements proven to cure CMT2L, and evidence is limited. Some nutrients are important for nerve health in general. Always discuss supplements with a doctor, especially in young people. PMC+1
I will briefly describe each in simple language (not strict dosing instructions).
Vitamin B12 (cobalamin) – Important for making myelin (the insulation of nerves). Low B12 can cause neuropathy. Supplementing B12 in people who are deficient can improve nerve function and reduce numbness or tingling. Typical adult doses in deficiency can be high and sometimes given by injection; in general use, lower oral doses are used. Mechanism: supports DNA synthesis in nerve cells and maintains myelin sheaths. PMC
Vitamin B1 (thiamine or benfotiamine) – Thiamine is needed for energy production in nerves. Deficiency can cause painful neuropathy. Benfotiamine is a fat-soluble form that may better enter nerves. Mechanism: improves glucose handling and reduces harmful sugar by-products that injure nerves. It is taken orally in divided doses, but exact dose should be set by a doctor. PMC
Vitamin B6 (pyridoxine – with caution) – Small amounts are needed for normal nerve function. However, high doses over long periods can cause neuropathy, so it must be used very carefully. Mechanism: cofactor in neurotransmitter production. Only low, diet-level doses are usually safe, and many experts avoid extra B6 in neuropathy unless there is proven deficiency. PMC
Folate (Vitamin B9) – Folate is needed to make DNA and red blood cells. Low folate can indirectly harm nerves through anemia and high homocysteine. Mechanism: supports one-carbon metabolism and methylation in nerve cells. Doctors sometimes combine folate with B12 if blood tests show low levels. PMC
Vitamin D – Vitamin D supports bone, muscle, and immune health. Low levels are common and can worsen muscle weakness and falls. Mechanism: acts through vitamin D receptors in muscle and immune cells, helping muscle contraction and reducing inflammation. Doctors often correct vitamin D deficiency using standard supplements, especially in people with limited sunlight or mobility. PMC+1
Vitamin E – Vitamin E is an antioxidant that protects cell membranes from damage. Severe deficiency, although rare, can cause a neuropathy that looks similar to CMT. Mechanism: neutralizes free radicals in nerve and muscle cell membranes. Supplementation is usually only needed if levels are low or in certain malabsorption diseases. PMC
Alpha-Lipoic Acid – Alpha-lipoic acid is an antioxidant used in some countries for diabetic neuropathy. Mechanism: reduces oxidative stress and improves blood flow in nerves. Some small studies show improvement in neuropathic symptoms in diabetes, but evidence in CMT is lacking. It is taken orally or sometimes intravenously, under medical supervision. PMC
Omega-3 Fatty Acids (Fish Oil) – Omega-3s from fish oil help reduce inflammation and support cell membrane health. Mechanism: they are built into nerve cell membranes and can affect signalling and inflammation. They may also support heart health and mood. Usual doses are moderate and taken with meals, but they can increase bleeding risk in very high doses or with blood-thinners. PMC
Acetyl-L-Carnitine – This is a form of carnitine that helps transport fatty acids into mitochondria for energy. Some studies suggest it may help in certain neuropathies by supporting mitochondrial function and nerve regeneration. Mechanism: improves energy supply in nerve cells and may encourage nerve fiber regrowth. PMC
Coenzyme Q10 (CoQ10) – CoQ10 is part of the mitochondrial energy chain. Supplementation may support cells under stress and has been studied in mitochondrial and neuromuscular disorders. Mechanism: improves ATP production and acts as an antioxidant in mitochondria. Doses vary widely, and long-term safety should be supervised by a physician. PMC
Regenerative / Stem-Cell / “Immunity Booster Drugs
Currently, there are no approved stem cell or gene therapies for HSPB8-related CMT2L in routine clinical use. Research is ongoing, mostly in animal models or small trials for other CMT types. PMC+2CMT Research Foundation+2
Because you asked, here are research directions, not treatments you can buy in a pharmacy:
Gene Replacement Therapy – In some CMT types, researchers are testing viral vectors (like AAV) that carry a healthy copy of the gene into nerve cells. Mechanism: provide correct gene instructions so that cells make normal protein. For HSPB8, this approach is still at an early research stage. No standard dose or product is approved.
Gene Silencing / Editing (e.g., Antisense Oligonucleotides, CRISPR) – Some projects aim to silence harmful mutant proteins or correct the mutation directly in DNA. Mechanism: change or block abnormal gene messages so cells stop making toxic forms of the protein. This is highly experimental and only in controlled research settings. PMC+1
Mesenchymal Stem Cell (MSC) Therapy – MSCs from bone marrow or fat tissue are being studied for several neurological diseases. Mechanism: they may secrete growth factors and anti-inflammatory molecules that support nerve repair. Small trials in other neuropathies show mixed results, and safety and dosing remain under study. No MSC therapy is approved specifically for CMT2L. PMC
Neurotrophic Factor Delivery (e.g., NGF, BDNF, GDNF) – Researchers are exploring ways to deliver nerve growth factors or molecules that support axon survival. Mechanism: these proteins bind to receptors on neurons and stimulate survival, repair, and axon growth. Delivery methods include viral vectors, pumps, or engineered cells. Again, this is experimental and not routine treatment. PMC
Immune-Modulating Agents in Overlap Conditions – In people who have CMT plus an autoimmune neuropathy component, doctors may use immune therapies such as IVIG or steroids. Mechanism: reduce harmful immune attack on nerves. However, HSPB8-related CMT2L itself is a genetic axonal neuropathy, not primarily immune, so such treatments are not standard for pure CMT2L and are used only if there is clear autoimmune evidence. PMC
Clinical Trial Drugs Targeting Protein Quality Control (CASA Pathway) – HSPB8 is part of the chaperone-assisted selective autophagy (CASA) system that clears damaged proteins in muscle and nerve cells. PMC+1 Some experimental drugs aim to adjust autophagy or chaperone pathways to protect cells. These are in very early research stages; there is no approved product yet, no standard dosing, and they are only given inside clinical trials with strict safety rules.
Surgical Treatments
Surgery does not cure CMT2L, but it can correct deformities and improve function or reduce pain when braces and therapy are not enough.
Foot Tendon Transfers – Surgeons move tendons from stronger muscles to help weaker ones pull the foot into a better position. The purpose is to correct foot drop or high-arched foot to improve walking and balance. Mechanism: changing where the tendon attaches changes the direction of pull, helping raise the foot during walking. PMC+2Mayo Clinic+2
Foot and Ankle Osteotomies (Bone Cuts) – In severe deformities, the surgeon cuts and re-shapes bones of the foot or ankle. The purpose is to realign the foot, plant it more flat, and relieve pressure points. Mechanism: by changing the bone angles, the foot can share weight more evenly, making walking and shoe fitting easier. PMC
Joint Fusions (Arthrodesis) – When joints are very unstable or painful, they may be fused so they no longer move. The purpose is to create a stable, pain-free platform for walking. Mechanism: screws or plates hold bones together until they fuse; this sacrifices motion but increases stability and can reduce pain. PMC+1
Hand Surgery (Tendon Balancing, Joint Fusion) – In advanced hand deformities, tendon transfers or joint fusions can improve pinch and grip. The purpose is to make daily tasks like holding utensils or writing easier. Mechanism is similar to foot surgery: moving tendons or fusing unstable joints to improve mechanical advantage. PMC+1
Spine Surgery (for Severe Scoliosis) – Some people with neuromuscular conditions develop spinal curvature. If this becomes severe and affects sitting, walking, or breathing, fusion surgery may be considered. The purpose is to straighten and stabilize the spine. Mechanism: rods and screws hold the vertebrae in better alignment while the bones fuse. This is major surgery and only used when clearly necessary. PMC
Preventions and Protection
You cannot prevent the gene mutation itself, but you can prevent complications and extra nerve damage:
Avoid medicines known to be toxic to peripheral nerves (for example, certain chemotherapy drugs) unless absolutely needed and under specialist care. PMC
Protect feet with well-fitting shoes, insoles, and regular foot checks to avoid ulcers and infections. Mayo Clinic+1
Use braces and walking aids early when recommended; do not wait until many falls have happened. Mayo Clinic+1
Keep a healthy body weight to reduce stress on weak feet and ankles. PMC+1
Maintain regular, gentle exercise to preserve strength and flexibility, avoiding complete inactivity. Muscular Dystrophy Association+2nhs.uk+2
Avoid smoking and heavy alcohol use, which can worsen neuropathy. PMC
Manage other health problems like diabetes, thyroid disease, or vitamin deficiencies that can add extra nerve damage. PMC+1
Use skin protection and avoid walking barefoot on unsafe surfaces to prevent injuries you may not feel. Mayo Clinic+1
Have regular follow-ups with neurologists and orthopaedic or rehabilitation specialists to catch problems early. PMC+2Mayo Clinic+2
For family planning, consider genetic counselling to understand inheritance and testing options. MedlinePlus+1
When to See a Doctor
You should see a doctor (preferably a neurologist) or seek urgent help if:
You notice new or quickly worsening weakness in feet, legs, hands, or arms.
You start falling more often or cannot walk safely even with your usual aids.
You develop new severe pain, burning, or numbness that interferes with sleep or daily life.
You see skin sores, ulcers, or infections on your feet or legs that do not heal.
You have changes in bladder or bowel control, or sudden severe back pain with leg weakness.
You notice breathing problems, very poor sleep, or severe fatigue, especially when lying flat.
You feel very low, anxious, or have thoughts of harming yourself because of chronic illness.
You plan to start any new strong medicine, supplement, or “stem cell” product and want to check safety.
Early medical review helps adjust braces, therapies, and medicines before problems become serious. Mayo Clinic+2Muscular Dystrophy Association+2
What to Eat and What to Avoid
Food cannot change the gene, but a healthy diet supports nerves, muscles, bones, and general health.
Eat plenty of vegetables and fruits – They provide vitamins, minerals, and antioxidants that protect cells from damage. PMC
Choose whole grains (brown rice, oats, whole-wheat bread) for stable energy and better blood sugar control, which is important because diabetes can worsen neuropathy. PMC+1
Include lean proteins like fish, eggs, beans, lentils, and lean meat to support muscle repair and strength. Fatty fish also supply omega-3 fats good for cell membranes. PMC
Use healthy fats such as olive oil, nuts, and seeds in moderation instead of trans fats or very fatty fried foods. These help heart health and may reduce inflammation. PMC
Ensure enough vitamin D and calcium through diet (dairy or fortified alternatives) and safe sunlight exposure to protect bones weakened by reduced mobility. Mayo Clinic+1
Avoid very sugary drinks and snacks, which cause rapid blood sugar spikes and weight gain, both harmful for nerves and feet. PMC+1
Limit processed foods high in salt and trans fats, which raise blood pressure and heart risk, especially important when activity is limited. PMC
Avoid heavy alcohol use, which can directly damage peripheral nerves and worsen neuropathy. PMC
Be careful with “miracle” supplements or extreme diets found online; they may be untested, expensive, or unsafe. Always talk to your doctor before starting them. PMC+1
Stay hydrated by drinking enough water throughout the day, which supports circulation and overall well-being. PMC
Frequently Asked Questions
1. Is CMT2 caused by HSPB8 mutation curable?
No. At present there is no cure that can remove or fix the HSPB8 mutation in everyday clinical practice. Treatment focuses on managing symptoms, improving function, and preventing complications. Research into gene and stem-cell therapies is ongoing, but these are not yet routine treatments. PMC+2PMC+2
2. Will everyone with this mutation have the same severity?
No. Even in the same family, some people may have milder or more severe symptoms. Factors like exact mutation type, other genes, lifestyle, and other illnesses can change how quickly weakness progresses. NCBI+2MalaCards+2
3. At what age does CMT2L usually start?
Most reports describe onset in later childhood, teenage years, or early adulthood, often between about 15 and 30 years. However, some people may notice symptoms earlier or later. NCBI+1
4. Can exercise make the disease worse?
Gentle, well-planned exercise guided by a therapist is usually helpful, not harmful. Very heavy or unsupervised high-impact exercise might strain weak muscles or joints. So the rule is: regular, low-impact, supervised activity is best. PMC+3Muscular Dystrophy Association+3nhs.uk+3
5. Why are braces and orthotics so important?
Because they support weak ankles and feet, correct foot position, and prevent falls. They also reduce the energy needed to walk, so people can stay active for longer. Braces do not stop the disease but help manage its effects every day. Mayo Clinic+2Muscular Dystrophy Association+2
6. Are there any special medicines only for CMT2L?
No specific drug is approved only for HSPB8-related CMT2L. Doctors use medicines approved for other neuropathic pain conditions (like gabapentin or duloxetine) to treat pain and related symptoms. PMC+2FDA Access Data+2
7. Can supplements like vitamins cure the disease?
Supplements can correct deficiencies and support general nerve health, but they cannot cure the genetic disease. They should only be used when needed and in safe doses, under medical guidance. PMC
8. Is surgery always needed for foot deformities?
No. Many people do well with braces, insoles, and physical therapy. Surgery is considered when deformities are severe, painful, or when braces no longer provide enough stability. Mayo Clinic+2PMC+2
9. Can this condition affect breathing?
CMT2L mainly affects distal limb nerves, so breathing problems are less common than in some other neuromuscular diseases. However, if weakness becomes very severe or if there is scoliosis, breathing can be affected, and doctors may check lung function. PMC+1
10. Is pregnancy safe for someone with CMT2L?
Many women with CMT have successful pregnancies. However, pregnancy can temporarily worsen symptoms and there may be questions about pain control and delivery. Planning pregnancy with a neurologist, obstetrician, and genetic counsellor is strongly recommended. PMC+1
11. Can children be tested for the HSPB8 mutation?
Genetic testing is possible, but the decision is complex. Predictive testing in children is usually done only after careful genetic counselling and discussion of pros and cons, including emotional effects and future planning. MedlinePlus+1
12. Will using a wheelchair mean the disease is very bad?
No. A wheelchair or scooter is a tool, not a sign of failure. Some people use a wheelchair for long distances and walk short distances with braces. The aim is to save energy, reduce pain and falls, and stay active socially and at work or school. PMC+1
13. Are stem-cell clinics advertised online safe?
Many private “stem-cell clinics” offer expensive treatments without strong scientific proof and sometimes without proper regulation. They may be unsafe. True stem-cell and gene-therapy treatments for CMT2L are currently available only in carefully controlled clinical trials. Always discuss such offers with a neurologist before considering them. PMC+1
14. How often should someone with CMT2L see their doctor?
This varies, but many experts recommend regular follow-ups (for example once or twice a year) with earlier visits if symptoms change. Orthopaedic and therapy reviews may be needed more often when braces are being adjusted or surgery is planned. Mayo Clinic+2Muscular Dystrophy Association+2
15. What is the long-term outlook (prognosis)?
CMT2L usually progresses slowly over many years. Many people remain able to walk, especially with braces and therapy, and live a normal life span. The level of disability varies. Early diagnosis, good supportive care, and healthy lifestyle choices can make a big difference to comfort, safety, and independence. NCBI+2MalaCards+2
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 22, 2025.
