Supporting someone with CMT2C

At a glanceThis page is for partners, parents, children, relatives and friends of someone with CMT2C. CMT2C can weaken the hands and feet, and it often affects the voice, breathing and skeleton too [6]. It varies a great deal from person to person, even within one family [6], so the best guide to helping is always the person you are supporting.

Understand what they live with

• It is not the same for everyone. CMT2C can be so mild that it goes unrecognized, or it can be life-threatening [6]. Symptoms can start anywhere from birth to after age 80 [6], and people in the same family can be affected very differently [18].
• Weakness is not only in the feet. In CMT2C it can be uneven and can affect the shoulders, hips and knees as well as the lower legs and feet [6].
• Much of it is hard to see. In the largest TRPV4 registry, 79% of people reported difficulty walking, 79% difficulty with balance, 49% arthritic-like pain and 41% dizziness on standing [3].
• What bothers people most. Registry participants named speech and breathing problems (22%) and leg weakness (21%) as their most bothersome symptoms [3].
• It is not known to affect thinking. The clinical summary of TRPV4 disease describes CMT2C as a condition of the peripheral nerves, voice, breathing, hearing and skeleton, and does not list cognitive problems as a feature [6]. A weak voice or a wheelchair says nothing about how someone thinks, so speak to them, not about them.
• Hearing can be affected. 27% of registry participants had partial hearing loss [3]. Ask whether it helps to face them when you talk and to turn down background noise.

The Symptoms and outlook page has the full picture, with numbers. The hidden side, from the planning behind every day to the worry about what comes next, is on Why CMT2C is so hard to live with.

Know the urgent signs

Help with everyday life

The most useful help is usually the help someone asks for. Ask what would make a difference, offer rather than insist, and let them decide.

• Hands. 49% of registry participants had difficulty with buttons or zippers and 23% with eating utensils [3]. If a task is fiddly, ask before stepping in.
• Balance and getting up. With balance problems so common [3], keep walkways clear at home and give them time to stand up and steady themselves, since dizziness on standing affects many people with TRPV4 disease [3].
• Feet. Reduced sensation can hide injuries, so daily foot checks are advised [83]. If they want help, an extra pair of eyes is useful.
• Braces, aids and wheelchairs. 49% of registry participants used orthotic aids and 32% used a wheelchair at least some of the time [3]. These are tools that keep people active, not signs of giving up.
• Paperwork. The Hereditary Neuropathy Foundation (HNF) has practical guides on bracing, mobility aids, home accessibility, legal rights, insurance and school accommodations [87]. My own experience of paying for custom braces and claiming the cost back is on the Practical tips page.

Voice, breathing and colds

• Voice box problems are described as “a hallmark of TRPV4-related neuromuscular disease” [6]. In the registry, 45% of people reported hoarseness, 40% noisy breathing in and 55% shortness of breath [3]. If their voice is weak, be patient and give them time to finish.
• Your cold matters more than you think. Upper respiratory infections cause vocal fold swelling and can worsen airway obstruction [6]. If you are unwell, ask whether they would rather you visit another time.
• Night-time breathing. Difficulty breathing when lying flat and sleep apnea can occur [6]. When breathing muscles are weak, night-time support comes from a bilevel (BiPAP) machine or a home ventilator, not CPAP alone, which does not help weak breathing muscles [307]. If you share a bedroom, you may be the first to notice a change. Tell them, so they can raise it at their next breathing check. The signs to watch for, such as restless sleep, morning headaches that fade soon after waking, and sleepiness during the day, are listed on Practical tips [289].

Appointments, medicines and supplements

• Yearly checks. Recommended monitoring for TRPV4 disease includes a neurological examination, a physical therapy assessment, an ear, nose and throat (ENT) review with laryngoscopy (a camera check of the vocal folds), breathing tests, a sleep study and a hearing assessment [6]. Offering a ride, sending a reminder or coming along to take notes can make a long list of appointments easier.
• Specialist clinics. CMT Centers of Excellence offer specialist diagnosis, genetic counseling and multidisciplinary care [85].
• Medicines. The Charcot-Marie-Tooth Association (CMTA) lists two drugs with evidence-backed potential for harm in CMT, both chemotherapy drugs: vincristine and paclitaxel [35]. The review behind that list stressed that people with CMT “should not be denied effective treatments” [36]. Make sure every doctor they see knows they have CMT, and leave medication decisions to their doctors [35].
• Supplements are their call. No supplement has been tested in CMT2C, but that mostly means nobody has checked yet. Rare-disease research is short of funding, and supplements are hard to patent, so few large trials get run [172]. A missing study is not proof that something cannot help. If a supplement has few side effects and might help, it is reasonable for them to read up on it, talk it through with their doctor or pharmacist, and make their own decision [136]. Think of it as a possible extra alongside exercise, braces and medical care, not a replacement. You can help by reading the evidence with them, and by gently checking two things. First, does their doctor know everything they take? Some supplements interact with medicines [174]. Second, are they sticking to the label dose? Too much vitamin B6, for example, can itself damage nerves [58]. Please don’t send “miracle cure” articles, which can add pressure, however kindly meant. The Supplements page goes through the evidence one supplement at a time.

Moving together

Exercise within a person's own capability is encouraged [6]. The CMTA suggests swimming and water exercise, walking with poles or braces, yoga, Pilates, resistance training and balance work, guided by a physical therapist who knows neuromuscular disease, and advises avoiding “high-impact or overly strenuous activities” [65]. High-intensity training is linked to a higher risk of injury in neuromuscular disease [56].

• Be a walking or swimming partner, at their pace.
• Shortness of breath is common in TRPV4 disease [3], so let them set the speed and the distance, and never push for “just one more”.

If you are their partner or spouse

• You see the day-to-day more closely than anyone. If they would like, keep short notes on any changes between appointments, especially in voice, breathing and sleep, which are part of the recommended yearly checks [6].
• Family planning. Each child of a parent with CMT2C has a 50% chance of inheriting the variant [6], and how severe it would be “cannot be accurately predicted” [6]. Genetic counseling is recommended [6], and in pregnancy, care from a high-risk obstetrician or maternal-fetal medicine specialist is advised [6]. HNF's CMT Genie program offers telehealth genetic counseling for a fee [88]. If they are thinking about children, the options, from having a child without testing to IVF with embryo testing, are set out on Practical tips. Whatever they choose, the choice is theirs to make.
• Rights and insurance. HNF's guides cover legal rights and insurance [87].

If you are the parent of a child with CMT2C

• Early onset is common. In the registry, 54% of people had symptoms within the first two years of life [3]. Congenital forms may plateau for long periods or progress in adulthood [6].
• Yearly checks for children also include weight and height at each visit and a musculoskeletal check for contractures, hip dysplasia, scoliosis and tethered cord [6].
• Exercise can help children. In a randomized trial of 60 children with CMT, 24 weeks of progressive resistance training preserved ankle strength over the next two years, compared with a sham program [60]. That trial was not done in CMT2C, so plan any program with your child's physical therapist [65].
• School. HNF's resources include guides on school accommodations [87].
• Other parents. The Roots is the CMTA’s community program for parents and caregivers of children with CMT, from birth to nine years old. It connects families at the same stage of life, shares helpful resources and offers a private group chat. You can join through a form on its page [315].
• Research. The Johns Hopkins TRPV4 natural history study is open to children and adults aged 3 to 80, for now only in the United States and Canada [101]. See Help move research forward below.
• Where it came from. A parent can carry the variant with signs so mild that nobody has recognized them [6], and new (de novo) variants are common in the most severe forms [6]. Genetic counseling can help the whole family understand what applies to you [6]. Nobody chooses the genes they pass on.

If you are their child or another blood relative

• You could carry it too. A relative who seems unaffected may still have the variant. Signs can be so mild that they are missed or put down to aging, and noticeable symptoms can start later in life [6]. Genetic testing is the only way to know for sure.
• A result does not predict severity. Severity varies widely, even within one family [18], and cannot be predicted from the gene result [6].
• Testing is a personal choice. Genetic counseling is recommended [6], and services such as CMT Genie can arrange it [88].
• Supporting an older parent. Because signs can be put down to aging [6], it helps to know that CMT2C needs its own yearly checks of voice, breathing, sleep and hearing, not just care for the feet and hands [6].

If you are a friend or colleague

• Plan with them, not around them. Ask about walking distances, stairs, seating and parking before you choose a place, rather than leaving them out.
• Choose quieter places. With hoarseness and hearing loss both common [3], a quiet table can make conversation much easier.
• Don't push drinks. Alcohol impairs balance and makes injuries more likely [98], and 79% of people in the TRPV4 registry already have difficulty with balance [3].
• Keep inviting them. If they say no this time, ask again next time.
• At work. HNF's guides cover legal rights [87].

Help move research forward

There is no approved disease-modifying treatment for CMT2C yet [6], but the first drug designed for it, ABS-0871, has completed a healthy-volunteer study [4]. You can help the person you support take part, and you can take part yourself.

• Studies and registries. Besides the Johns Hopkins study above, the Inherited Neuropathy Consortium’s natural history study collects the data TRPV4 research relies on [52]. CMTA Patients as Partners in Research gives early notice of clinical trials [54]. GRIN, the Global Registry for Inherited Neuropathies run by HNF, is another option, free and open worldwide [55]. Online forms can be tiring for weak hands, so offer to help fill them in.
• Your voice counts too. The FDA holds patient-focused drug development meetings and patient listening sessions so that patients and caregivers can share their experience directly with the agency [90]. The CMTA has organized a private listening session with the FDA for the CMT2C/TRPV4 community on 20 October 2026 [104], and its speakers have already been chosen. Why ABS-0871 matters explains what that drug means to us.
• Follow the trials. The CMT Research Foundation's tracker lists the planned ABS-0871 patient trial [34]. The Trials and research page has the latest status.

The steps for joining studies and registries are on the Community page.

Look after yourself too

Supporting someone with a lifelong condition is a long road, and you do not need to know everything. The patient organizations on the Organizations page, such as CMT UK, CMT Australia and the European CMT Federation, offer support and information. The Questions page has short answers to the questions I am asked most.

Next: Guides and checklists