Charcot-Marie-Tooth Disease with Nephropathy Syndrome

Charcot-Marie-Tooth disease with nephropathy syndrome means a person has Charcot-Marie-Tooth (CMT) disease, which is a genetic nerve disease, together with a kidney disease (nephropathy). In most reported families, the kidney problem is a special type of scarring of the tiny filters in the kidney, called focal segmental glomerulosclerosis (FSGS). This combination is strongly linked to changes (mutations) in a gene called INF2. The INF2 gene helps control the inner skeleton of cells, especially Schwann cells (nerve-supporting cells) and podocytes (filtering cells in the kidney). When INF2 does not work properly, both the peripheral nerves and kidney filters can slowly get damaged, causing weakness in the arms and legs plus protein loss in the urine and kidney failure over time. PubMed+3NCBI+3New England Journal of Medicine+3

Charcot-Marie-Tooth (CMT) disease is a group of inherited disorders that damage the peripheral nerves in the legs, arms, hands, and feet. People often develop weakness, thin muscles, high-arched feet, and problems with walking.NINDS+1 In a small number of families, CMT happens together with kidney disease (nephropathy). This combination is sometimes linked to changes in a gene called INF2, and may cause a glomerular disease such as focal segmental glomerulosclerosis (FSGS) or other types of glomerulopathy.New England Journal of Medicine+2PubMed+2

Other Names

Doctors and researchers use several other names for this condition. They all describe the same basic problem: a hereditary nerve disease together with kidney disease.

• Charcot-Marie-Tooth disease dominant intermediate E (CMTDIE) – a specific subtype of CMT with “intermediate” nerve conduction speed and autosomal dominant inheritance, often linked to INF2 mutations and kidney disease. Charcot-Marie-Tooth Association+1

• INF2-associated Charcot-Marie-Tooth disease with FSGS – stresses that the INF2 gene is changed and the kidney disease is focal segmental glomerulosclerosis. New England Journal of Medicine+2MDPI+2

• Hereditary motor and sensory neuropathy with glomerulopathy – “hereditary motor and sensory neuropathy” is another name for CMT; “glomerulopathy” means a disease of the kidney filters. jns-journal.com+1

• CMT with nephropathy or CMT with renal impairment – general terms used in case reports when CMT and kidney damage happen in the same person or family. Karger Publishers+3PMC+3ejpn-journal.com+3

• Hereditary neuropathy with focal segmental glomerulosclerosis – focuses on the kidney diagnosis (FSGS) together with the inherited neuropathy. NJM Online+1

All these names describe a genetic disease that affects both peripheral nerves and kidneys.

Types

Doctors do not have one strict “official” type list for CMT with nephropathy, but we can think about types in a practical way. The types are usually based on nerve study results, kidney involvement, and disease severity.

1. Intermediate CMT with nephropathy (CMTDIE)
   In this type, nerve conduction tests show speeds that are between very slow (demyelinating) and normal (axonal). It is dominantly inherited and linked to INF2 mutations. Many people with this type develop FSGS and protein in the urine. Charcot-Marie-Tooth Association+2MDPI+2

2. CMT with early-onset nephropathy
   Here, kidney problems start in childhood or teenage years, sometimes at the same time or even before obvious nerve weakness is noticed. Children may first be found to have protein in the urine or swelling of the legs. institut-myologie.org+2Wiley Online Library+2

3. CMT with late-onset nephropathy
   Some people have classic CMT symptoms from childhood, but their kidney problems appear later, even in early or mid-adult life. They may have had normal kidney tests for years and then suddenly show proteinuria or rising creatinine. New England Journal of Medicine+2Karger Publishers+2

4. CMT with mild, stable kidney involvement
   In a few cases, protein in the urine is mild and kidney function stays almost normal for many years. The main problem is neuropathy, but kidney function must still be monitored carefully. ScienceDirect+2Charcot-Marie-Tooth Association+2

5. CMT with progressive kidney failure (advanced nephropathy)
   In more severe cases, FSGS leads to chronic kidney disease and finally end-stage kidney disease, meaning the kidneys no longer work well and dialysis or transplant may be needed. Lippincott Journals+2ScienceDirect+2

These “types” help doctors think about how quickly the kidney problem develops and how severe it becomes, while the nerve damage pattern is usually intermediate CMT caused by INF2.

Causes and Risk Factors

The main true cause of Charcot-Marie-Tooth disease with nephropathy syndrome is a pathogenic genetic variant in the INF2 gene. Many other factors can increase the risk or speed up kidney damage, but they do not create the basic disease by themselves.

1. INF2 gene mutation (root cause)
   Changes in the INF2 gene are the key cause. INF2 helps control actin, a protein that shapes cells. Certain INF2 mutations damage both Schwann cells in nerves and podocytes in kidney filters, leading to CMT and FSGS in the same person. Wiley Online Library+3New England Journal of Medicine+3MDPI+3

2. Autosomal dominant inheritance
   The disease usually follows an autosomal dominant pattern. This means one sick copy of the gene from either mother or father is enough to cause the disease. Each child has about a 50% chance to inherit the mutation. Charcot-Marie-Tooth Association+2National Organization for Rare Disorders+2

3. De novo INF2 mutations
   Sometimes the mutation is new in the patient and not found in either parent. This is called a “de novo” mutation. The person is the first in the family to have CMT with nephropathy, but can still pass it to their own children. institut-myologie.org+2kireports.org+2

4. Family history of CMT with kidney disease
   Having relatives with CMT, FSGS, or both increases the chance that a person’s symptoms are due to a shared INF2 mutation or a similar genetic change. PMC+2Karger Publishers+2

5. Other rare CMT gene variants plus kidney disease
   A few reports describe families where other CMT-related genes coexist with kidney disease. The causal link is less clear, but they show that some people may carry more than one genetic risk that affects nerves and kidneys together. PMC+2ejpn-journal.com+2

6. Consanguinity (parents related by blood)
   When parents are related (for example, cousins), the chance of passing on rare genetic variants is higher. This can increase the risk of different inherited neuropathies or kidney diseases in the same family. Wiley Online Library+1

7. High blood pressure
   In a person with INF2-related kidney disease, long-standing high blood pressure makes kidney damage worse and faster. It raises the pressure in tiny kidney vessels and speeds up scarring. Lippincott Journals+1

8. Diabetes mellitus
   Diabetes itself can harm kidney filters. If someone has both INF2-related nephropathy and diabetes, the two problems can add up, causing quicker loss of kidney function. Lippincott Journals+1

9. Obesity and metabolic syndrome
   Extra body weight, high blood fats, and insulin resistance put extra strain on the kidneys and can make FSGS worse. Obesity-related FSGS can overlap with genetic FSGS. ScienceDirect

10. Smoking
    Smoking reduces blood flow, promotes inflammation, and can speed up kidney scarring. In someone with INF2 mutations, smoking is a harmful extra stress on already vulnerable kidneys. ScienceDirect

11. Long-term use of nephrotoxic medicines
    Some drugs, such as certain painkillers (NSAIDs), some antibiotics, contrast dyes, and chemotherapy drugs, can hurt kidney cells. If these are used for long periods, kidney function in a person with INF2-related nephropathy can decline faster. Lippincott Journals+1

12. Recurrent kidney infections
    Repeated infections of the urinary tract or kidneys can add extra damage to kidney tissue and worsen existing FSGS. Lippincott Journals+1

13. Poor control of proteinuria
    High leakage of protein in the urine is both a marker and a driver of kidney damage. If proteinuria is not recognized and managed, scarring of the glomeruli can progress more quickly. ScienceDirect+2Lippincott Journals+2

14. High-salt diet
    Eating a lot of salt increases blood pressure and fluid retention. This extra pressure in the kidneys can speed up scarring in people with FSGS. Lippincott Journals+1

15. Dehydration and low blood volume episodes
    Repeated dehydration or low blood pressure episodes can reduce blood flow to the kidneys. Kidney tissue that is already fragile due to INF2 changes may be more easily damaged. Lippincott Journals+1

16. Other autoimmune kidney diseases on top of FSGS
    If a person with INF2-related FSGS also develops an autoimmune disease such as lupus, the combined effect can greatly increase kidney injury. ScienceDirect

17. Lack of regular monitoring
    Because kidney disease can be silent at first, not doing regular urine and blood tests in someone known to have INF2-related CMT may delay diagnosis and allow more damage to build up. ScienceDirect+2Charcot-Marie-Tooth Association+2

18. Late referral to kidney specialists
    If patients do not see a nephrologist until kidney damage is advanced, there is less chance to slow the disease. Lippincott Journals+1

19. Severe, long-standing neuropathy-related immobility
    Severe weakness and reduced mobility can lead to blood clots, infections, and poor blood flow, indirectly affecting kidney health and overall resilience. NCBI+2Patient+2

20. Coexisting cardiovascular disease
    Heart disease and blood vessel disease are more common when kidney function is reduced. Reduced heart function and poor circulation can again worsen kidney perfusion and damage. Lippincott Journals+1

In summary, INF2 mutation is the core cause, and the other factors mainly decide how quickly and how severely the kidney part of the syndrome progresses.

Symptoms

Symptoms are a mix of nerve problems (from CMT) and kidney problems (from FSGS or other nephropathy). Not every person has all symptoms, and the order can differ.

1. Gradual weakness in feet and lower legs
   One of the earliest signs is slowly increasing weakness in the muscles of the feet and ankles. People may trip more often, have trouble running, or find it hard to lift the front of the foot, leading to “foot drop.” Wiley Online Library+3NCBI+3Johns Hopkins Medicine+3

2. High-arched feet and clawed toes
   Over time, muscle imbalance in the feet can cause pes cavus (high arches) and curled toes. These changes come from long-term nerve damage and are a common feature of CMT. NCBI+2Patient+2

3. Difficulty walking and poor balance
   Weak ankle muscles and loss of feeling in the feet make walking uneven and unsafe. People may have a “steppage gait,” need to watch their feet while walking, and find it hard to walk in the dark or on uneven ground. NCBI+2Patient+2

4. Weakness in hands and forearms
   Later, weakness can involve the hands. Simple tasks like buttoning clothes, writing, or opening jars become hard because of grip weakness and wasting of hand muscles. NCBI+2Johns Hopkins Medicine+2

5. Numbness and tingling in feet and hands
   Damage to sensory nerves causes abnormal sensations. People may feel pins and needles, burning, or numbness in a “glove and stocking” pattern, starting in the toes and fingers. PM&R KnowledgeNow+3NCBI+3Johns Hopkins Medicine+3

6. Reduced tendon reflexes
   On examination, doctors often find reduced or absent ankle reflexes. The person usually does not feel this, but it is a typical sign of CMT. NCBI+2Patient+2

7. Muscle wasting (atrophy) in calves and feet
   Long-standing denervation makes muscles thin and wasted. The lower legs may look like “inverted champagne bottles” – thin calves with relatively normal thighs. NCBI+2Patient+2

8. Fatigue and reduced stamina
   Because of weak muscles and poor nerve supply, everyday tasks require more effort. People get tired easily when walking, climbing stairs, or doing fine hand work. NCBI+2Patient+2

9. Foamy urine (protein in the urine)
   Kidney damage allows large amounts of protein to leak into the urine. This can make the urine look frothy or foamy in the toilet. Sometimes this is the first visible sign of nephropathy. ScienceDirect+2Lippincott Journals+2

10. Swelling of legs, ankles, and around the eyes
    Low blood protein from heavy protein loss can cause fluid to leak into tissues, leading to puffiness of the eyelids, swollen ankles, and sometimes swelling in the abdomen. Lippincott Journals+1

11. Weight gain from fluid retention
    Even with weak muscles, body weight may rise quickly because extra fluid is stored in the body when the kidneys are not working well. Lippincott Journals+1

12. High blood pressure (hypertension)
    Damaged kidneys often lead to higher blood pressure. Many patients with CMT and nephropathy are first discovered to have kidney disease because they are found to have high blood pressure during routine checks. ScienceDirect+2Lippincott Journals+2

13. Decreased urine output or change in urine pattern
    As kidney function gets worse, the amount and timing of urine can change. Some people pass less urine, especially in advanced stages, or may wake up more often at night to urinate. Lippincott Journals+1

14. Hearing problems in some patients
    Certain CMT subtypes, including some INF2-related forms, can affect the auditory nerve, causing hearing loss or ringing in the ears (tinnitus). This does not happen in everyone but is reported in some families. Patient+2NJM Online+2

15. Headaches, breathlessness, or nausea in advanced kidney failure
    When kidney function becomes very low, waste products build up in the blood. This can cause generalized symptoms such as headaches, feeling sick, poor appetite, and shortness of breath. Lippincott Journals+1

Diagnostic Tests

Physical Examination

Physical examination is the first step. The doctor looks, listens, and feels to get clues about nerve disease and kidney disease.

1. General neurological examination
   The doctor checks muscle bulk, strength, tone, and coordination in the arms and legs. In CMT with nephropathy, weakness is usually worse in the feet and hands, with thin calf muscles and reduced coordination. This exam helps decide that the problem is mainly in peripheral nerves, not the brain or spinal cord. NCBI+2Patient+2

2. Gait and balance assessment
   The person is asked to walk normally, on heels, on toes, and in a straight line. The doctor looks for a high-stepping gait, foot drop, and poor balance. These findings strongly support a diagnosis of CMT or hereditary motor and sensory neuropathy. NCBI+2PM&R KnowledgeNow+2

3. Inspection of feet and hands
   The doctor looks at the shape of the feet (high arches, hammer toes) and hands (wasting of small hand muscles). These changes develop slowly and are classic signs of long-standing CMT. NCBI+2Patient+2

4. Reflex testing
   Using a reflex hammer, the doctor taps on tendons at the ankle, knee, and elbow. In CMT, ankle reflexes are usually decreased or absent. This helps confirm that the problem is neuropathic. NCBI+2Patient+2

5. Blood pressure and edema check
   The doctor measures blood pressure and looks for swelling in the legs and around the eyes. High blood pressure and edema are important signs that kidney disease is present along with the neuropathy. ScienceDirect+2Lippincott Journals+2

Manual and Bedside Tests

These are simple tests that can be done at the bedside without large machines.

6. Manual muscle testing (MRC scale)
   The doctor asks the patient to move joints against resistance and grades strength from 0 to 5. This systematic testing shows which muscles are weak and how severe the weakness is, helping to follow the disease over time. NCBI+2Patient+2

7. Sensory testing with cotton, pin, and tuning fork
   Light touch, pin-prick, and vibration sense are checked at the toes, ankles, fingers, and wrists. Loss of vibration and pin sensation in a “stocking-glove” pattern is typical of CMT. Reduced vibration at the ankles can appear early. PM&R KnowledgeNow+3NCBI+3Johns Hopkins Medicine+3

8. Romberg balance test
   The patient stands with feet together, first with eyes open and then closed. If they sway much more with eyes closed, this suggests loss of position sense in the feet due to peripheral nerve damage. NCBI+2Patient+2

9. Heel-to-toe, heel-walk, and toe-walk tests
   These walking tests show how well someone can control ankle and foot muscles. Difficulty walking on heels suggests foot drop; difficulty walking on toes suggests weak calf muscles. These tests are practical measures of daily function in CMT. NCBI+2Patient+2

Laboratory and Pathology Tests

Lab tests and tissue studies confirm kidney involvement and the genetic cause.

10. Urinalysis (dipstick and microscopy)
    A simple urine test checks for protein, blood, and other markers. In CMT with nephropathy, the dipstick often shows protein, sometimes in large amounts. Microscopy can show fat droplets or other changes suggesting nephrotic-range protein loss. ScienceDirect+2Lippincott Journals+2

11. 24-hour urine protein or protein-to-creatinine ratio
    This test measures how much protein is lost in the urine over a day or uses a single sample to estimate it. High levels confirm significant kidney damage and help doctors judge disease severity and treatment response. Lippincott Journals+1

12. Blood tests for kidney function (creatinine, urea, eGFR)
    Blood levels of creatinine and urea rise as kidney function falls. The estimated glomerular filtration rate (eGFR) is calculated from these values and gives an idea of how well the kidneys are working overall. Lippincott Journals+1

13. Serum albumin and lipid profile
    Heavy protein loss in the urine lowers blood albumin and raises cholesterol and triglycerides. This pattern is typical of nephrotic syndrome, which is common in FSGS. These tests help confirm the type and severity of kidney involvement. Lippincott Journals+1

14. Genetic testing for INF2 and CMT gene panel
    A blood sample is used to study DNA. Targeted testing of INF2 or a broader CMT gene panel can identify the exact mutation. Finding an INF2 mutation that matches known disease-causing variants strongly supports the diagnosis of CMTDIE with nephropathy. Wiley Online Library+3New England Journal of Medicine+3MDPI+3

15. Kidney biopsy with light microscopy, immunofluorescence, and electron microscopy
    In some patients, a tiny sample of kidney tissue is taken with a needle. Under the microscope, doctors can see the pattern of damage. In this syndrome, biopsy usually shows segmental scarring of some glomeruli (FSGS), sometimes with special features that suggest INF2-related disease. Immunofluorescence and electron microscopy give more detail about immune deposits and podocyte injury. New England Journal of Medicine+2NJM Online+2

Electrodiagnostic Tests

These tests directly measure the electrical activity of nerves and muscles.

16. Nerve conduction studies (NCS)
    Small electrical pulses are applied to nerves, and the response is recorded further along the nerve. In CMTDIE, the conduction velocities are usually in the “intermediate” range – slower than normal but not as slow as classic demyelinating CMT. The size of the responses may be reduced, showing axonal loss. This pattern helps classify the CMT type and supports a diagnosis of intermediate CMT. Charcot-Marie-Tooth Association+3NCBI+3Patient+3

17. Electromyography (EMG)
    A fine needle is placed into muscles to record their electrical activity. EMG can show signs of chronic denervation and reinnervation, such as large motor unit potentials and reduced recruitment. This confirms that muscle weakness is due to nerve damage rather than a primary muscle disease. Medtext Publications+3NCBI+3Patient+3

Imaging Tests

Imaging looks at the structure of kidneys and nerves.

18. Renal ultrasound
    Ultrasound uses sound waves to create pictures of the kidneys. It is painless and safe. In CMT with nephropathy, the kidneys may look normal in early disease. In later stages, they may become smaller and more scarred. Ultrasound can also rule out other causes of kidney problems, such as obstruction. Lippincott Journals+1

19. Nerve ultrasound or MRI neurography
    High-resolution ultrasound or special MRI techniques can show enlarged peripheral nerves or changes in nerve structure in some CMT patients. In INF2-related CMT, studies have described nerve enlargement, which supports the diagnosis when combined with clinical and genetic findings. MDPI+2Continuum+2

20. Foot and ankle X-rays or limb MRI
    X-rays of the feet and ankles can show high arches, claw toes, and other deformities caused by long-standing neuropathy. MRI of limb muscles can show patterns of muscle wasting and fatty replacement. These images help in planning orthopedic care and confirm the chronic nature of the neuropathy. Medtext Publications+3NCBI+3Patient+3

Goals of Treatment

The main goals in Charcot-Marie-Tooth disease with nephropathy are:

1. Protect nerve function – slow down weakness, improve balance and walking, and reduce pain.Mayo Clinic+2nhs.uk+2

2. Protect kidney function – reduce protein in urine, control blood pressure, control diabetes if present, and delay or prevent kidney failure.PubMed+2Karger Publishers+2

3. Maintain independence – with physiotherapy, occupational therapy, braces, and home modifications.PMC+2Muscular Dystrophy Association+2

4. Prevent complications – falls, foot ulcers, severe deformity, infections, anemia, bone disease, and cardiovascular problems.nhs.uk+2Charcot-Marie-Tooth Association+2

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Non-pharmacological treatments

1. Physical therapy and stretching
Regular, gentle stretching and strengthening help keep joints loose and muscles as strong as possible. A physiotherapist designs safe exercises to protect weak ankles and knees, reduce contractures, and improve walking style. Physical therapy is considered one of the most important treatments for CMT.PMC+2nhs.uk+2

2. Occupational therapy for daily tasks
An occupational therapist teaches easier ways to dress, bathe, cook, write, and use electronic devices with weak hands or feet. They may suggest special tools with larger grips or adapted keyboards so the person can stay independent for longer at home, work, or school.Muscular Dystrophy Association+1

3. Custom ankle-foot orthoses (AFOs)
AFO braces support weak ankle and foot muscles. They help lift the front of the foot so it does not drag, reducing tripping and falls. In CMT, AFOs often improve walking speed, balance, and confidence, especially when foot drop is present.ScienceDirect+1

4. Proper footwear and insoles
Wide, supportive shoes with firm heel counters and cushioned insoles help protect the feet and prevent pressure sores. A podiatrist can prescribe custom insoles to correct high arches or clawed toes, which are common in CMT and can cause pain when walking.nhs.uk+1

5. Balance and gait training
Because nerve damage affects feeling in the feet, people with CMT are at higher risk of losing balance. Special balance exercises, treadmill training, and practice with turning and stair-climbing can lower fall risk. Therapists often use parallel bars or harness systems to keep training safe.PMC+1

6. Low-impact strengthening exercise
Gentle activities such as swimming, cycling, and light resistance training can keep muscles active without over-tiring them. Over-exertion may actually worsen weakness, so programs must be carefully planned and increased slowly over time.nhs.uk+1

7. Aerobic exercise for heart and kidney health
Walking, stationary biking, and pool exercise improve blood pressure, blood sugar, and cholesterol. This helps protect kidneys and blood vessels and supports overall stamina. Workouts should be moderate intensity and adjusted for fatigue and neuropathic pain.Mayo Clinic+2Karger Publishers+2

8. Pain self-management strategies
Heat packs, cold packs, TENS (small electrical nerve stimulation), guided relaxation, and pacing daily activities can help with burning or tingling pain. These methods are often combined with pain medicines to reduce the dose needed and to limit side effects.Palliative Care Network of Wisconsin+1

9. Foot care and podiatry
Regular foot checks, nail care, and treatment of calluses are vital. Because feeling in the feet is reduced, small cuts may not be noticed and can become ulcers, especially if kidney disease or diabetes are present. A podiatrist can also help choose shoes and monitor deformities.nhs.uk+1

10. Fall-prevention home modifications
Simple home changes, such as removing loose rugs, adding grab bars in the bathroom, improving lighting, and using non-slip mats, reduce falls. An occupational therapist can assess the home and suggest the safest layout for walking aids or wheelchairs.Charcot-Marie-Tooth Association+1

11. Assistive devices (canes, walkers, wheelchairs)
As weakness progresses, canes or walkers may be needed for stability. Some people later need wheelchairs for longer distances. The goal is not to “give up,” but to move safely, avoid injuries, and save energy for important activities like school, work, or family time.Muscular Dystrophy Association+1

12. Hand therapy and splints
Hand therapists teach special exercises and may provide wrist or thumb splints to support weak hand muscles. This can improve grip, handwriting, and the ability to use tools or devices, which is helpful for both study and daily chores.Muscular Dystrophy Association+1

13. Breathing and posture exercises
Some people with CMT, especially with spine curvature or diaphragm weakness, may notice shortness of breath. Breathing exercises, posture training, and sometimes non-invasive ventilation at night can improve comfort and sleep quality.PMC+1

14. Psychological counselling and CBT
Living with a chronic nerve and kidney disease can cause anxiety or depression. Cognitive-behavioural therapy (CBT), stress-management training, and supportive counselling help people cope with pain, fatigue, and future worries and improve quality of life.PMC+1

15. Sleep hygiene and fatigue management
Regular sleep times, avoiding screens late at night, and managing pain before bedtime can improve sleep. Good sleep helps mood, concentration, and pain tolerance, which is important when dealing with progressive conditions such as CMT and CKD.Mayo Clinic+1

16. Kidney-friendly diet and fluid planning
Dietitians adjust protein, salt, potassium, and fluid intake to match kidney function. This helps control swelling, blood pressure, and waste products in the blood, and can slow progression of kidney disease in CMT-nephropathy.PubMed+2FDA Access Data+2

17. Blood pressure and blood sugar monitoring
Home blood pressure monitors and regular blood sugar checks (if diabetic) help doctors adjust medicines quickly. Tight control of blood pressure and diabetes is one of the best ways to protect kidneys for many years.Drugs.com+2Hopkins Guides+2

18. Patient education and genetic counselling
Because this syndrome is genetic, families benefit from clear information about inheritance, testing, family planning, and early screening for kidney problems. Genetic counselling explains risks in simple language and supports decision-making.New England Journal of Medicine+2National Organization for Rare Disorders+2

19. Support groups and patient organisations
CMT and kidney-disease organisations (for example CMTA and CMT patient guides, or kidney foundations) provide education materials, peer support, and updates about research and clinical trials. This helps patients feel less alone and more confident in managing their condition.Charcot-Marie-Tooth Association+2Charcot-Marie-Tooth Association+2

20. Avoidance of nerve- and kidney-toxic substances
Patients are advised to avoid smoking, heavy alcohol, and certain medicines that are toxic for nerves or kidneys (for example, some chemotherapy agents or long-term high-dose NSAIDs), unless there is no alternative and a specialist supervises them.PMC+2www.elsevier.com+2

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Drug treatments

(Typical doses below are general adult ranges from drug labels or clinical references and not personal advice. Dose must be adjusted for age, kidney function, and other drugs.)

1. Gabapentin – neuropathic pain modulator
Gabapentin is used widely for nerve pain. It calms over-active nerve cells, which can reduce burning, tingling, and electric-shock-like pain in CMT. Typical adult neuropathic-pain doses range from about 300–1200 mg three times daily, with a maximum of 3600 mg per day, but lower doses are needed in kidney disease. Common side effects are sleepiness, dizziness, and swelling.NCBI+2FDA Verification Portal+2

2. Pregabalin – neuropathic pain and anxiety
Pregabalin works in a similar way to gabapentin, reducing abnormal nerve firing and easing neuropathic pain. For diabetic nerve pain, labels suggest starting at 150 mg/day in divided doses, increasing up to 300–600 mg/day if tolerated. Kidney disease often requires dose reduction. Dizziness, sleepiness, weight gain, and swelling may occur.FDA Access Data+2FDA Access Data+2

3. Duloxetine – serotonin-noradrenaline reuptake inhibitor
Duloxetine is an antidepressant that also treats chronic neuropathic pain and painful diabetic neuropathy. Usual pain doses are around 60 mg once daily, sometimes 30–120 mg/day depending on response. It works by increasing serotonin and noradrenaline in the nervous system, which can dampen pain signals. Side effects include nausea, dry mouth, and sleep changes; it is used cautiously or avoided in severe kidney or liver disease.FDA Access Data+1

4. Amitriptyline – tricyclic antidepressant for pain
Amitriptyline is an older antidepressant also used in low doses (often 10–25 mg at night, sometimes up to 75–100 mg/day) to reduce nerve pain and improve sleep. It blocks reuptake of serotonin and noradrenaline and has some sodium-channel effects. Side effects include dry mouth, constipation, drowsiness, and heart rhythm changes, so it must be used carefully in older or cardiac patients.Palliative Care Network of Wisconsin+1

5. Topical lidocaine patches or gels
Lidocaine patches (usually up to 12 hours on, 12 off) or gels can be applied to areas of focal burning pain. They block local sodium channels in small nerve fibers and reduce pain with minimal systemic side effects. They are especially useful when oral drugs cannot be increased because of kidney or brain side effects.Palliative Care Network of Wisconsin+1

6. Paracetamol (acetaminophen) – basic analgesic
Paracetamol is often the first choice for mild pain because it is generally safer for kidneys than long-term NSAIDs. Typical adult dosing is up to 3–4 g/day in divided doses, but lower limits are used in liver disease or frail patients. It works mainly in the central nervous system to reduce pain and fever. Overdose can severely damage the liver, so daily limits are very important.Drugs.com

7. Short-term tramadol – step-up analgesic
Tramadol is a centrally acting pain medicine that works on opioid receptors and also affects serotonin and noradrenaline. It may be used short-term when neuropathic and simple pain drugs are not enough. Typical adult doses are around 50–100 mg every 4–6 hours, with a maximum of about 400 mg/day, but must be reduced in kidney failure. It can cause nausea, dizziness, and dependence, so specialists prescribe it very carefully.Palliative Care Network of Wisconsin+1

8. Lisinopril – ACE inhibitor for BP and kidney protection
Lisinopril lowers blood pressure and reduces pressure inside the glomeruli, which can reduce protein leakage and slow kidney damage in conditions such as diabetic nephropathy and some FSGS cases. Typical adult starting doses are 5–10 mg once daily, titrated up to 20–40 mg/day if tolerated. Cough, high potassium, and low blood pressure are possible side effects.FDA Access Data+2NCBI+2

9. Losartan – angiotensin receptor blocker (ARB)
Losartan is another common kidney-protective blood pressure medicine. In type 2 diabetes with kidney disease it has been shown to reduce kidney events and proteinuria. Adult doses often start around 25–50 mg once daily, with a range up to 100 mg/day. It blocks the angiotensin II receptor, lowering blood pressure and glomerular pressure. Side effects include dizziness, high potassium, and rarely kidney function changes.FDA Access Data+2FDA Access Data+2

10. Dapagliflozin – SGLT2 inhibitor
Dapagliflozin is a diabetes and kidney-protective medicine that helps the kidneys excrete extra glucose and sodium. Trials show it reduces kidney and heart failure events in people with chronic kidney disease, with or without diabetes. A common dose is 10 mg once daily, but kidney function limits its use. It can increase urination and may slightly raise the risk of genital infections and rare ketoacidosis.FDA Access Data+2FDA Access Data+2

11. Other ACE inhibitors or ARBs (enalapril, valsartan, etc.)
If lisinopril or losartan are not suitable, other ACE inhibitors or ARBs may be used with similar kidney-protective effects. Doses and choices depend on blood pressure, side effects, and kidney function. As with any RAAS blocker, potassium and creatinine must be monitored closely.Hopkins Guides+1

12. Loop diuretics (for example, furosemide)
Loop diuretics help the kidneys remove extra salt and water, reducing swelling in the legs and controlling blood pressure. They act in the loop of Henle in the nephron. Doses vary widely and are usually given once or twice daily. Side effects include low potassium, dehydration, and hearing disturbance at high doses.Hopkins Guides

13. Epoetin alfa or other ESAs – anemia treatment
Chronic kidney disease often causes low red blood cell counts. Erythropoiesis-stimulating agents (ESAs) like epoetin alfa are injectable medicines that act like natural erythropoietin to increase red blood cell production in the bone marrow. Doses are weight- and hemoglobin-based and are given weekly or every few weeks. Too-high doses can raise blood pressure and clot risk, so careful monitoring is essential.Hopkins Guides+1

14. Vitamin D analogs (for example, calcitriol)
In CKD, the kidneys cannot activate vitamin D properly, leading to bone and mineral problems. Active vitamin D analogs help control parathyroid hormone levels and protect bones. Doses are small (often microgram amounts several times per week) and tailored to lab values. High doses can cause high calcium and phosphorus.Hopkins Guides+1

15. Sodium bicarbonate (oral) for metabolic acidosis
Many people with advanced CKD develop low blood bicarbonate levels. Sodium bicarbonate tablets can correct this acidosis, which may slow kidney decline and improve muscle function. Doses are adjusted to keep serum bicarbonate in a target range while avoiding too much sodium and swelling.Hopkins Guides+1

16. Statins (for example, atorvastatin)
Because kidney disease and CMT-related inactivity increase cardiovascular risk, statins are often used to lower LDL cholesterol. Atorvastatin doses commonly start around 10–20 mg once daily, adjusted according to cholesterol targets. Muscle aches and rare liver enzyme changes are the main concerns.Hopkins Guides+1

17. Immunosuppressive drugs for glomerulopathies (for example, corticosteroids)
If the kidney biopsy shows immune-mediated disease such as some forms of FSGS or membranous nephropathy, doctors may use corticosteroids (like prednisone) or other immunosuppressants. These reduce immune attack on glomeruli but have many side effects (weight gain, infection risk, bone loss), so regimens are highly individualized and time-limited.PubMed+2Indian Journal of Nephrology+2

18. Rituximab or other biologics in selected cases
Rituximab, a monoclonal antibody that targets B cells, is sometimes used in difficult cases of membranous nephropathy or other immune kidney diseases. It is given as an IV infusion in the hospital at intervals of weeks or months. It can increase infection risk and must be reserved for severe, biopsy-proven disease.Indian Journal of Nephrology+1

19. Insulin or other glucose-lowering drugs
When diabetes is present, tight blood sugar control is one of the strongest kidney-protective steps. Insulin regimens or non-SGLT2 oral agents are chosen according to age, kidney function, and lifestyle. Doses are completely personalized and require frequent monitoring to avoid hypoglycemia.FDA Access Data+1

20. Vaccines (inactivated) as “immune support”
Up-to-date vaccines against influenza, COVID-19, pneumococcus, and hepatitis B help protect people with CKD and chronic illness from serious infections. These are not classic “drugs for CMT,” but they are very important to support overall immunity and reduce hospitalizations.Hopkins Guides+1

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Dietary molecular supplements

1. Omega-3 fatty acids (fish oil)
Omega-3s have anti-inflammatory and mild triglyceride-lowering effects. Some studies suggest they may help reduce inflammation and could have modest kidney and nerve benefits, though evidence is not strong in CMT. Typical doses are around 1–2 g/day of EPA+DHA, but higher doses must be supervised because of bleeding risk and kidney status.Hopkins Guides+1

2. Coenzyme Q10 (CoQ10)
CoQ10 supports mitochondrial energy production and has been studied in some neuromuscular and mitochondrial disorders. Doses in studies are often 100–300 mg/day in divided doses. It may improve fatigue or muscle performance in some people, but evidence in CMT-nephropathy is limited. Side effects are usually mild, like stomach upset.Repozytorium UR+1

3. Alpha-lipoic acid
Alpha-lipoic acid is an antioxidant that has shown benefit in some studies of diabetic neuropathy. Doses in research are commonly 300–600 mg/day. It scavenges free radicals and may improve nerve blood flow. Kidney patients must use it carefully, because safety data in advanced CKD are limited.Palliative Care Network of Wisconsin+1

4. Acetyl-L-carnitine
This amino-acid-like compound helps transport fatty acids into mitochondria and has been studied for neuropathic pain. Doses range from 500–1000 mg one to three times daily. Some trials show modest pain reduction and nerve conduction improvement, but more research is needed in hereditary neuropathies.Palliative Care Network of Wisconsin+1

5. B-complex vitamins (B1, B6, B12 – careful dosing)
B vitamins are essential for nerve health and red blood cell production. Supplementation may be helpful if there is deficiency, but high doses of B6 can actually cause neuropathy. Doses must stay within recommended daily allowances unless a doctor prescribes more. In CKD, active forms of B vitamins are sometimes used.Repozytorium UR+1

6. Vitamin D3 (cholecalciferol)
Low vitamin D is common in CKD and in people with reduced mobility. Supplement doses vary widely (often 800–2000 IU/day in mild deficiency, or higher under supervision). Vitamin D supports bones, muscles, and immune function. In advanced CKD, active vitamin D analogs are often used instead of simple D3.Hopkins Guides+1

7. Magnesium (within safe kidney limits)
Magnesium supports nerve and muscle function and may help with cramps. In CKD, excess magnesium can build up, so only low doses or dietary sources are usually recommended, and levels must be checked. Any magnesium supplement must be approved by the nephrologist.Hopkins Guides+1

8. Probiotics
Probiotic supplements or fermented foods can help maintain a healthy gut microbiome, which may reduce some uremic toxins produced in the intestine. Evidence in CKD is still emerging, and products and doses vary, so probiotics are an “optional, maybe helpful” supplement rather than a core therapy.Academia+1

9. Curcumin (turmeric extract)
Curcumin has anti-inflammatory and antioxidant effects and is being studied in many chronic diseases. Some small studies suggest possible benefits in kidney inflammation and metabolic health, but results are not yet strong enough to recommend high-dose use for everyone. Doses in studies often range from 500–1000 mg/day of standardized extract.Academia+1

10. Combined antioxidant formulas (vitamin C, E, etc.)
Antioxidant mixes are sometimes used to reduce oxidative stress. High doses of vitamin C can build up in CKD and cause oxalate problems, and excess vitamin E can increase bleeding risk. For this reason, only small to moderate doses, tailored by the nephrologist, are considered.Hopkins Guides+1

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Immune-booster and regenerative / stem-cell-related drugs

1. Erythropoiesis-stimulating agents (ESAs)
As mentioned above, ESAs like epoetin alfa not only correct anemia but also improve tissue oxygen delivery, which may support nerve and muscle function. They are given as injections in carefully calculated doses based on body weight and hemoglobin levels and require regular blood tests.Hopkins Guides+1

2. Intravenous immunoglobulin (IVIG)
IVIG is a concentrated antibody product given by infusion. It is sometimes used in immune neuropathies and immune kidney diseases but is not standard for typical genetic CMT. It modulates the immune system and can reduce harmful auto-antibodies. Dosing is based on weight (often grams per kilogram) and is done in hospital.Indian Journal of Nephrology+1

3. Rituximab (B-cell–depleting biologic)
Rituximab targets B lymphocytes and is used in some glomerular diseases such as membranous nephropathy or certain FSGS variants. By reducing B cells, it lowers auto-antibody production. Infusions are given in cycles weeks apart. Because it strongly suppresses immunity, it is used only in severe, biopsy-proven disease under specialist care.Indian Journal of Nephrology+1

4. Stem cell transplantation (hematopoietic)
In very rare cases with severe kidney failure or complex immune disease, hematopoietic stem cell transplantation may be considered in research settings. Stem cells “reset” the blood and immune system. This treatment has serious risks (infection, graft-versus-host disease) and is not standard therapy for CMT alone.New England Journal of Medicine+1

5. Experimental gene and VEGF-based therapies
Research in some CMT subtypes (like CMT2D) is exploring gene therapy and modulation of VEGF/Nrp1 signalling to protect motor neurons. These approaches aim to support nerve survival and regeneration but are still in early research stages and not available as routine treatment.Wikipedia+1

6. Vaccinations as immune protection
Vaccines such as influenza, COVID-19, pneumococcal, and hepatitis B are essential in people with CKD and chronic illness. They “train” the immune system to fight specific infections, reducing hospitalizations and kidney stress during severe illness. Schedules follow national guidelines and kidney-disease recommendations.Hopkins Guides+1

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Surgeries

1. Corrective foot and ankle surgery
In CMT, severe high-arched feet, clawed toes, and ankle instability can make walking painful and dangerous. Orthopedic foot surgery (osteotomies, tendon transfers, sometimes joint fusion) aims to straighten the foot, improve weight-bearing, and reduce pain so braces and shoes work better.Charcot-Marie-Tooth Association+1

2. Tendon transfer for foot drop
When some muscles are still strong, surgeons can move a working tendon so it lifts the front of the foot during walking. This can reduce tripping and may delay the need for a brace or wheelchair. Recovery involves a period of casting and later physiotherapy.Charcot-Marie-Tooth Association+1

3. Spine surgery for severe deformity
If scoliosis or kyphosis becomes severe and interferes with breathing or sitting, spinal fusion surgery may be considered. Metal rods and screws are used to straighten and stabilize the spine. This is major surgery and is done only when benefits clearly outweigh the risks.PMC+1

4. Vascular access surgery for dialysis
If kidney failure progresses to end-stage disease, an arteriovenous (AV) fistula or graft may be created surgically in the arm for hemodialysis. This access point allows repeated clean connection of the blood to the dialysis machine. It is planned before dialysis starts so that it can mature in time.Karger Publishers+1

5. Kidney transplantation
For some patients with advanced kidney failure and suitable overall health, kidney transplant gives the best quality of life and long-term outcome. The damaged kidneys are usually left in place, and a donor kidney is placed in the pelvis. Life-long immunosuppressive medicines are needed to prevent rejection.Karger Publishers+1

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Preventions

1. Keep blood pressure controlled – follow medication plans and low-salt diet to keep blood pressure in target range.Drugs.com+1

2. Protect kidneys from diabetes – maintain good blood sugar control with diet, exercise, and medicines if needed.FDA Access Data+1

3. Avoid nephrotoxic drugs when possible – limit or avoid long-term NSAIDs, certain antibiotics, and contrast dyes unless essential.Hopkins Guides+1

4. Avoid smoking and heavy alcohol – these harm blood vessels and nerves and speed kidney damage.PMC+1

5. Use safe footwear and foot care – daily foot checks and proper shoes prevent ulcers that can be hard to heal in CKD and neuropathy.nhs.uk+1

6. Prevent falls – use braces or walking aids when advised and keep the home safe.Charcot-Marie-Tooth Association+1

7. Stay active within limits – regular low-impact exercise supports heart, nerves, and kidneys without over-straining muscles.PMC+1

8. Maintain healthy weight and cholesterol – kidney-friendly diet and statins when needed lower cardiovascular risk.Hopkins Guides+1

9. Keep vaccinations up to date – protection from infections reduces kidney stress and hospital stays.Hopkins Guides+1

10. Get regular specialist follow-up – scheduled visits with neurology and nephrology help detect changes early and adjust treatment quickly.ScienceDirect+1

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When to see doctors

You should see your neurologist and nephrologist regularly as they recommend, even when you feel “stable.” Urgent review is needed if you notice:

• Rapid worsening of weakness, new difficulty walking, or sudden loss of balance.NINDS+1

• New or severe foot ulcers, skin infections, or unexplained fever.nhs.uk+1

• Sudden swelling of legs, face, or eyelids, or foamy urine suggesting heavy protein leakage.PubMed+1

• Shortness of breath at rest, chest pain, or very high or very low blood pressure readings.Drugs.com+1

• Very reduced urine output, nausea, vomiting, confusion, or drowsiness, which may signal advanced kidney failure or drug toxicity.PubMed+1

For any new medicines, supplements, or major diet change, always discuss first with your kidney and nerve specialists.

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What to eat and what to avoid

1. Eat plenty of vegetables and fruits that fit your kidney stage – low-potassium options if your potassium is high, such as apples, berries, cabbage, and green beans.Hopkins Guides+1

2. Choose lean proteins in the right amount – poultry, fish, eggs, and plant proteins as advised by your dietitian. Too much protein can strain kidneys; too little can cause weakness.Hopkins Guides+1

3. Use whole grains in moderation – oats, brown rice, or whole-grain bread as allowed; portions may be adjusted if phosphorus or potassium are high.Hopkins Guides

4. Limit salt and salty foods – avoid adding table salt, and cut down on pickles, instant noodles, chips, and processed meats to help control blood pressure and swelling.Hopkins Guides+1

5. Drink fluids as prescribed – some people need to limit fluids to prevent swelling and breathlessness, while others can drink freely. Follow your nephrologist’s specific plan.PubMed+1

6. Avoid regular high-dose NSAIDs – common painkillers like ibuprofen and naproxen can worsen kidney function if used often; always ask your doctor before taking them.Hopkins Guides+1

7. Avoid very high-salt processed foods – canned soups, fast food, salty snacks, and instant sauces can quickly exceed daily sodium limits.Hopkins Guides+1

8. Limit foods with very high potassium or phosphorus if advised – such as large portions of bananas, oranges, cola drinks, processed cheese, and organ meats in advanced CKD.Hopkins Guides+1

9. Avoid crash diets and bodybuilding supplements – high-protein powders and unregulated supplements can stress kidneys and may contain harmful substances.Hopkins Guides+1

10. Avoid herbal remedies without medical review – some herbs are directly toxic to kidneys or interact with CMT and kidney medicines. Always show any products to your doctors first.Hopkins Guides+1

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Frequently asked questions

1. Is Charcot-Marie-Tooth disease with nephropathy curable?
At present, there is no cure that reverses the genetic nerve or kidney damage. However, good supportive care, blood pressure and diabetes control, and lifestyle changes can greatly slow progression and maintain quality of life for many years.PMC+2www.elsevier.com+2

2. Will everyone with CMT develop kidney disease?
No. Only certain genetic subtypes (such as some INF2-related forms) are known to be associated with nephropathy, and even in these families, severity varies between people. Genetic testing and kidney screening help identify who is at risk.New England Journal of Medicine+2National Organization for Rare Disorders+2

3. Why is my urine foamy or bubbly?
Foamy urine often means there is protein leaking from the kidneys. In CMT with nephropathy, glomerular damage can allow protein to pass into the urine. This is a key reason to treat blood pressure and use ACE inhibitors or ARBs when appropriate.PubMed+2FDA Access Data+2

4. Can exercise make my neuropathy worse?
Too much intense exercise can fatigue weak muscles, but well-planned, low-impact exercise is usually helpful and recommended. A physiotherapist will design a safe program that avoids over-work weakness while keeping you active.PMC+2nhs.uk+2

5. Why do I need both a neurologist and a nephrologist?
The neurologist focuses on your nerves, muscles, gait, and pain. The nephrologist focuses on blood pressure, labs, dialysis risk, and kidney-protective medicines. Both sides are tightly linked in this syndrome, so coordinated care is essential.ScienceDirect+2National Organization for Rare Disorders+2

6. Can children with this syndrome go to regular school?
Many children can attend regular school with physical supports, such as braces, wheelchairs for long distances, and classroom adjustments. An occupational therapist and school team can plan modifications for mobility and writing tasks.Muscular Dystrophy Association+2Charcot-Marie-Tooth Association+2

7. Will I definitely need dialysis or transplant?
Not always. Some people have mild kidney involvement that stays stable for many years, especially with good control of blood pressure and proteinuria. Others progress to advanced CKD and may need dialysis or transplant. Regular follow-up and early treatment can delay or sometimes prevent this.PubMed+2Karger Publishers+2

8. Are there new treatments being researched?
Yes. Research is ongoing on gene therapy, neuroprotective drugs, and VEGF-related pathways in certain CMT types, as well as newer kidney-protective drugs like SGLT2 inhibitors and non-steroidal mineralocorticoid receptor antagonists. Many are still in trials and not yet standard therapy.Wikipedia+2ScienceDirect+2

9. Is pregnancy possible with this condition?
Many people with CMT and mild to moderate CKD can have successful pregnancies, but they are considered higher risk. Pre-pregnancy counselling and close monitoring by obstetrics, nephrology, and neurology are needed to manage blood pressure, kidney function, and medication safety.Academia+1

10. Can I use over-the-counter painkillers safely?
Simple paracetamol is often safest, but even that must respect maximum daily doses. NSAIDs like ibuprofen may harm kidneys, especially with ACE inhibitors or ARBs. You should always ask your nephrologist before taking any new medicine, even if it is sold without prescription.Drugs.com+1

11. Do braces mean my disease is getting worse?
Needing braces or walking aids does not always mean rapid progression. Often, they are introduced to prevent falls and joint damage and to save energy. Many people stay at the same functional level for years once they have proper supports and therapy.Charcot-Marie-Tooth Association+2Charcot-Marie-Tooth Association+2

12. Are supplements enough to treat this syndrome?
No. Supplements can sometimes support nutrition or nerve health, but they cannot replace blood pressure control, kidney-protective medicines, proper pain treatment, and physiotherapy. All supplements should be checked with your doctors, especially in CKD.Hopkins Guides+1

13. How often should my kidneys be checked?
Your nephrologist will decide, but many patients have blood tests, urine tests, and blood pressure checks every 3–6 months, or more often if the disease is active or medicines are changing. This helps detect problems early.PubMed+2Springer Medizin+2

14. Can diet alone fix my kidney disease?
Diet is very important, but it cannot fully reverse structural kidney damage. A kidney-friendly diet works together with medicines, blood-pressure control, and lifestyle changes to slow progression and reduce symptoms.Hopkins Guides+2PubMed+2

15. What is the most important thing I can do today?
The single most powerful step is to build a stable care team (neurology + nephrology + physiotherapy + dietitian), follow their medicine and diet plan, keep moving safely every day, and avoid things that harm nerves or kidneys, such as smoking and uncontrolled blood pressure.PMC+2www.elsevier.com+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 24, 2025.