Charcot-Marie-Tooth disease type 1D is a rare inherited nerve disorder that slowly affects movement and feeling in the feet and hands. Early symptoms of Charcot-Marie-Tooth disease type 1D often begin in childhood or early adult life and can include foot drop, frequent ankle sprains, high arches, and trouble with balance. Not everyone will have the same experience. This condition is lifelong and usually worsens gradually, but physical therapy, braces, supportive shoes, pain treatment, and sometimes surgery can help. Most people with this condition have a normal life span, though severity varies and daily activities may become harder over time.
How many people live with Charcot-marie-tooth disease type 1d?
Charcot-Marie-Tooth disease overall is estimated to affect about 2.8 million people worldwide (Charcot-Marie-Tooth Association, 2024) and about 150,000 people in the United States (National Institute of Neurological Disorders and Stroke, 2024). Charcot-Marie-Tooth disease type 1D is a very rare form that is thought to make up well under 1% of all CMT cases, so fewer than about 28,000 people worldwide and fewer than about 1,500 people in the United States may be living with CMT1D, but these are rough estimates rather than direct counts (GeneReviews, 2023).
Overview
Charcot-marie-tooth disease type 1dSymptoms
Charcot-Marie-Tooth disease type 1D often causes slowly worsening weakness in the feet and lower legs, with high arches or hammertoes. Many also have numbness or tingling. Over time, hand weakness and balance problems can make walking or buttoning clothes harder.
Outlook and prognosis
Charcot-Marie-Tooth disease type 1D usually progresses slowly, and many people stay mobile for years, especially with physical therapy, braces, and foot care. Weakness and balance problems can gradually increase over time, but life expectancy is typically normal.
Causes and risk factors
Charcot-Marie-Tooth disease type 1D is caused by a change in the EGR2 gene, usually inherited from a parent, though it can start new in a child. Family history is the main risk factor. Lifestyle does not cause it.
Genetic influences
Genetics are central to Charcot-Marie-Tooth disease type 1D, because it is caused by a change in the MPZ gene. Different genetic variations can affect how early symptoms of Charcot-Marie-Tooth disease type 1D begin and how severe they become.
Diagnosis
Doctors diagnose Charcot-Marie-Tooth disease type 1D by looking at clinical features, family history, and nerve testing. The genetic diagnosis of Charcot-Marie-Tooth disease type 1D is confirmed with genetic tests. Sometimes imaging or other tests help rule out similar conditions.
Treatment and drugs
Treatment for Charcot-Marie-Tooth disease type 1D focuses on staying mobile and protecting weak muscles and joints. Many living with Charcot-Marie-Tooth disease type 1D benefit from physical therapy, braces or shoe inserts, pain care, and regular nerve and foot checks.
Symptoms
Charcot-Marie-Tooth disease type 1D often shows up in the feet and lower legs first, making walking, balance, and stamina harder than they used to be. For many people with Charcot-Marie-Tooth disease type 1D, the early features of Charcot-Marie-Tooth disease type 1D include high-arched feet, tripping, ankle weakness, or numbness in the feet. It is a nerve condition, so the changes can affect both strength and feeling, and later may involve the hands as well. Features vary from person to person and can change over time.
Weakness in the feet and ankles can make it hard to lift the front of the foot fully when walking. This can lead to tripping, a slapping step, or trouble on stairs and uneven ground.
Many people with Charcot-Marie-Tooth disease type 1D develop very high arches or curled toes. Shoes may fit poorly, standing can become uncomfortable, and walking may feel less stable.
The muscles in the lower legs can become thinner over time because the nerves do not signal them well. Some may notice the calves look smaller while climbing, running, or rising onto the toes becomes harder.
Reduced feeling in the feet is common and may include numbness, tingling, or a pins-and-needles sensation. This can make it harder to notice blisters, judge the ground clearly, or keep balance in the dark.
How people usually first notice Charcot-marie-tooth disease type 1d?
How Charcot-Marie-Tooth disease type 1D is first noticed often begins in childhood, when a child starts tripping more than expected, has trouble running, or develops an unusual walking pattern because the muscles in the feet and lower legs are getting weaker. The first signs of Charcot-Marie-Tooth disease type 1D can also include high arches, curled toes, frequent ankle sprains, or shoes wearing unevenly, while a doctor may notice reduced reflexes or mild loss of sensation in the feet. In some families the changes appear slowly and are easy to miss at first, but over time the pattern of foot shape changes, balance trouble, and lower-leg weakness usually becomes clearer.
Types of Charcot-marie-tooth disease type 1d
No distinct types of Charcot-Marie-Tooth disease type 1D are widely recognized.
Can I slow down the onset of symptoms?
No, there is currently no proven lifestyle change or medical treatment that can meaningfully delay the start of symptoms in Charcot-Marie-Tooth disease type 1D, because it is caused by an inherited change that affects the nerves. General healthy habits like staying active, not smoking, limiting alcohol, and avoiding medicines that can damage nerves may help protect overall nerve and muscle health, but they have not been shown to prevent the condition or reliably push back when it begins; early follow-up with a specialist and physical therapy can help once symptoms appear. Research is ongoing, and while that can feel frustrating, early support can still help many people living with this condition stay safer and more independent.
What genetics can tell you about symptoms
Yes. In Charcot-Marie-Tooth disease type 1D, the exact genetic change can give doctors some clues about symptoms, especially whether nerve problems are more likely to start in infancy or childhood, how much weakness and numbness may develop, and whether walking, balance, or hand use may be affected more severely. Even so, symptoms can still vary from one person to another, including within the same family, so genetics helps with prediction but cannot forecast every detail.
Causes and risk factors
If foot weakness or high arches run in your family, the main cause of Charcot-Marie-Tooth disease type 1D is usually an inherited change in the EGR2 gene. In some people, this gene change appears for the first time and is not inherited from either parent. The main risk factors for Charcot-Marie-Tooth disease type 1D are family history and carrying this gene change. Genetic testing can sometimes clarify your personal risk. Other nerve stressors, such as diabetes, heavy alcohol use, smoking, or exposure to nerve-damaging toxins, do not cause Charcot-Marie-Tooth disease type 1D but can affect how severe symptoms become.
What are the most common causes or risk factors?
The main cause of Charcot-Marie-Tooth disease type 1D is a change in a gene called EGR2, which helps nerves keep their protective covering so signals can travel normally. The biggest risk factor is family history, because this condition is usually passed down from a parent. In some families the gene change starts for the first time in one person, and there are no known lifestyle, diet, injury, or environmental risk factors that cause this type.
Environmental and biological risk factors
When people look up the risk factors for Charcot-Marie-Tooth disease type 1D, it helps to know that proven outside triggers have not been found. Doctors often group risks into internal (biological) and external (environmental). For CMT1D, clear non-inherited biological or environmental risk factors have not been established, and most families did nothing to cause it. If it appears without a family history, it is usually linked to a new change present from the start rather than a known exposure.
No specific chemicals, infections, radiation, or pollution have been proven to cause CMT1D. Researchers have not found a reliable outside trigger for this condition.
Maternal illness, routine medicines, and ordinary pregnancy events are not established causes of Charcot-Marie-Tooth disease type 1D. In most families, there is no evidence that something during pregnancy led to the condition.
Prematurity, labor complications, and newborn care problems are not known to cause CMT1D. These issues can affect health in other ways, but they do not explain the condition itself.
Some people with CMT1D have no affected relatives because the underlying change can arise new at conception. This is a biological event, and no clear environmental trigger has been identified for it.
Genetic risk factors
Charcot-Marie-Tooth disease type 1D often runs in families and affects the nerves that help muscles move and carry feeling, so weakness, foot changes, and numbness can build up over time. When people ask about the genetic causes of Charcot-Marie-Tooth disease type 1D, the answer usually centers on a harmful change in a gene called EGR2, which helps nerves keep their protective covering. People with the same risk factor can have very different experiences, even within one family. Genetic testing can help confirm the diagnosis and show whether relatives may also be at risk.
EGR2 changes: Most cases of Charcot-Marie-Tooth disease type 1D are caused by a harmful change in the EGR2 gene. This gene helps peripheral nerves form and maintain myelin, the insulating layer that helps nerve signals travel smoothly.
Dominant inheritance: Charcot-Marie-Tooth disease type 1D is usually passed down in an autosomal dominant pattern, which means one altered copy of the gene can be enough to cause the condition. If a parent carries the change, each child has a 1 in 2, or 50%, chance of inheriting it.
New variants: Sometimes the gene change happens for the first time in one person instead of being inherited from a parent. This can explain Charcot-Marie-Tooth disease type 1D in someone with no known family history.
Family history: Having a close relative with Charcot-Marie-Tooth disease, unexplained nerve damage, high arches, foot drop, or longstanding numbness can raise genetic concern for this subtype. In families with these patterns, testing for an EGR2 change may help clarify risk.
Lifestyle risk factors
Charcot-Marie-Tooth disease type 1D is an inherited neuropathy, so lifestyle habits do not cause it. Still, how lifestyle affects Charcot-Marie-Tooth disease type 1D can be important because daily habits may change fatigue, balance, pain, mobility, and the risk of complications. The most relevant lifestyle risk factors for Charcot-Marie-Tooth disease type 1D are those that increase nerve stress, muscle overuse, falls, skin injury, or avoidable loss of function.
Too little regular movement can speed deconditioning, joint stiffness, and loss of endurance in people with Charcot-Marie-Tooth disease type 1D. Appropriate low-impact exercise and guided strengthening may help preserve walking ability, balance, and day-to-day function.
Repeated high-strain activity can worsen fatigue, trigger pain, and increase the risk of overuse injuries in already weak distal muscles. Pacing, rest breaks, and tailored therapy are often more helpful than pushing through exhaustion.
Extra body weight places more stress on weak ankles, feet, and leg muscles, which can make walking less efficient and increase fall risk. It may also worsen foot pain and make bracing or mobility aids harder to use comfortably.
Poor foot care can allow pressure areas, blisters, ulcers, or nail problems to develop because foot shape changes and sensory loss may reduce early warning signs. Well-fitted footwear, daily skin checks, and prompt treatment of minor injuries can help prevent complications.
Risk prevention
For people with Charcot-Marie-Tooth disease type 1D, there is no known way to prevent the condition itself because it is inherited. Prevention is mainly about lowering the chance of complications, protecting strength and mobility, and catching problems early. Many living with Charcot-Marie-Tooth disease type 1D may notice slowly increasing foot weakness, balance trouble, or hand fatigue over time, so daily habits and regular care can make a real difference. Prevention is flexible—it adapts to your life and health background.
Ongoing care with a neurologist and rehabilitation team can help track Charcot-Marie-Tooth disease type 1D and spot changes early. This can make it easier to adjust braces, therapy, or other support before walking or hand use becomes harder.
Guided exercise can help maintain strength, flexibility, and balance without overstraining weak muscles. A therapist can show safer ways to move, which may lower the risk of falls and joint stiffness.
Supportive shoes, inserts, or ankle-foot braces can improve stability and protect the feet in Charcot-Marie-Tooth disease type 1D. These supports may make everyday tasks, like walking across uneven ground or climbing stairs, feel safer.
Removing trip hazards at home, improving lighting, and using handrails can reduce injuries from falls. If early symptoms of Charcot-Marie-Tooth disease type 1D include foot drop or poor balance, these changes can be especially helpful.
Can you prevent Charcot-marie-tooth disease type 1d?
No, Charcot-Marie-Tooth disease type 1D usually cannot be prevented because it is an inherited nerve condition caused by a gene change present from birth. If it runs in your family, meeting with a genetics specialist can help you understand the chance of passing it on. While this does not prevent the condition itself, early care, safe exercise, good foot care, and avoiding things that can further damage nerves, such as heavy alcohol use and some medicines, may help lower the risk of added problems.
Transmission
Charcot-Marie-Tooth disease type 1D is not infectious, so it cannot be passed from one person to another through touch, coughing, kissing, sex, or sharing food. Instead, Charcot-Marie-Tooth disease type 1D is usually passed down in families because of a gene change that affects the nerves.
When doctors explain how Charcot-Marie-Tooth disease type 1D is inherited, they usually mean that a parent living with it has a 1 in 2, or 50%, chance of passing the changed gene to each child. In some families, the gene change happens for the first time in a child, so there may be no earlier family history.
When to test your genes
Consider genetic testing if you or relatives have a slowly progressive inherited neuropathy, especially childhood or teen onset foot drop, high arches, balance problems, or hand weakness. A confirmed result can clarify the subtype, guide family planning, and help tailor monitoring, rehabilitation, and counseling.
Diagnosis
Charcot-Marie-Tooth disease type 1D is usually diagnosed when long-standing nerve symptoms, foot shape changes, and a careful exam point doctors toward an inherited nerve condition. Many living with Charcot-Marie-Tooth disease type 1D first seek help because of frequent ankle sprains, trouble lifting the front of the foot, or hands becoming weaker over time. Getting a diagnosis is often a turning point toward answers and support. The genetic diagnosis of Charcot-Marie-Tooth disease type 1D typically combines clinical features with nerve testing and a confirmatory genetic test.
Doctors ask about balance problems, tripping, foot deformities, hand weakness, numbness, and when symptoms began. A detailed family and health history can help show whether similar nerve problems have affected relatives across generations.
The exam often looks for high arches, hammertoes, thin lower legs, reduced reflexes, and weakness in the feet or hands. Doctors also check walking pattern, sensation, and whether both sides of the body are affected in a similar way.
Nerve conduction tests and electromyography measure how well the peripheral nerves and muscles are working. In Charcot-Marie-Tooth disease type 1D, these studies often show a demyelinating pattern, meaning nerve signals are slowed because the nerve covering is not working normally.
A blood or saliva test can look for a change in the MPZ gene, which is linked to Charcot-Marie-Tooth disease type 1D. This is the main way to confirm the diagnosis of Charcot-Marie-Tooth disease type 1D after the clinical picture suggests it.
How is Charcot-marie-tooth disease type 1d diagnosed?
Doctors usually suspect Charcot-Marie-Tooth disease type 1D from the pattern of symptoms and exam findings, such as slowly worsening weakness in the feet and legs, trouble with balance, high arches or curled toes, reduced reflexes, and often a family history of similar problems. They often do tests that measure how fast electrical signals travel through the nerves, and sometimes a muscle test, to show the nerves are sending signals too slowly. A blood test that looks for the inherited gene change linked to type 1D is then used to confirm the diagnosis.
Stages of Charcot-marie-tooth disease type 1d
Charcot-Marie-Tooth disease type 1D does not have defined progression stages. This is because it usually develops slowly and can vary a lot from one person to another, rather than moving through clear step-by-step phases. Often the process begins when you notice changes in daily life, such as more ankle sprains, trouble lifting the front of the feet, hand weakness, or slowly changing foot shape; these can be early symptoms of Charcot-Marie-Tooth disease type 1D. Doctors usually diagnose and monitor it by reviewing symptoms over time, examining strength, reflexes, and sensation, and sometimes using nerve tests and genetic testing to confirm the cause.
Outlook and prognosis
Outlook for Charcot-Marie-Tooth disease type 1D is usually compatible with a normal life span, but the severity and rate of progression can vary widely even within affected families. Most people have slowly progressive weakness, foot deformities, sensory loss, and balance problems that can increase disability over time, yet many remain ambulatory for decades with supportive care, orthotics, physical therapy, and sometimes surgery for foot complications. Symptoms often begin in childhood or adolescence, and progression is typically gradual rather than rapidly life-threatening. Respiratory failure, major heart complications, and shortened survival are not considered typical features of Charcot-Marie-Tooth disease type 1D. Prognosis is generally better in terms of survival than in terms of long-term function, with the main burden coming from mobility limitations, pain, fatigue, and risk of falls. Early rehabilitation, monitoring for contractures and scoliosis, and genetic counseling can help improve quality of life and long-term planning.
Long-term effects
Charcot-Marie-Tooth disease type 1D usually affects movement and feeling in the feet and legs first, then may slowly involve the hands over time. Long-term effects vary widely, even among people in the same family. Many living with Charcot-Marie-Tooth disease type 1D have a normal life span, but day-to-day function can change gradually across childhood, adulthood, and later life.
Weakness in the lower legs often leads to tripping, foot drop, and a slower, less steady walk. Early symptoms of Charcot-Marie-Tooth disease type 1D often start in the feet, and these changes may become more noticeable over the years.
High arches, flat feet, curled toes, or other foot deformities can develop as muscles around the foot weaken and pull unevenly. These changes may make standing for long periods, finding comfortable shoes, or walking on uneven ground harder.
Over time, weakness can affect the hands and forearms, making buttons, zippers, handwriting, or opening jars more difficult. Some people also notice reduced finger control and slower fine motor tasks.
Numbness or reduced feeling in the feet and hands can make it harder to notice pressure, temperature, or minor injuries. For many, this can mean more balance problems and a higher chance of cuts, blisters, or falls going unnoticed at first.
How is it to live with Charcot-marie-tooth disease type 1d?
Living with Charcot-Marie-Tooth disease type 1D often means adapting to slowly changing strength, balance, and sensation, especially in the feet and legs, and sometimes in the hands as well. For many people with CMT1D, everyday tasks such as walking long distances, climbing stairs, fastening buttons, or keeping up with school, work, or exercise can take more planning, more energy, and sometimes support like braces, physical therapy, or home and workplace adjustments. Because this condition is inherited and can vary even within the same family, it can also affect the people around you: loved ones may help with practical tasks, transportation, or emotional support, while also navigating questions about family planning and genetic risk. Even so, many living with CMT1D build full, active lives by pacing themselves, protecting their joints and skin, and using the right tools and care to stay as independent as possible.
Treatment and drugs
Treatment for Charcot-Marie-Tooth disease type 1D focuses on easing symptoms, protecting strength and balance, and helping people stay as active and independent as possible, because there is no cure that reverses the nerve damage itself. Many living with Charcot-Marie-Tooth disease type 1D do best with a mix of physical therapy, stretching, braces or shoe inserts to steady the ankles and feet, and sometimes occupational therapy to make hand tasks like buttons, jars, or typing easier. Doctors may also treat pain, muscle cramps, or tremor with medicines when needed, and if foot shape changes become severe, surgery is sometimes considered to improve walking and reduce falls; Supportive care can make a real difference in how you feel day to day. Because symptoms and progression vary, treatment is tailored to each person, and regular follow-up helps adjust the plan over time as early symptoms of Charcot-Marie-Tooth disease type 1D change.
Can you cure Charcot-marie-tooth disease type 1d?
No, there is currently no cure for Charcot-Marie-Tooth disease type 1D. Treatment cannot reverse the nerve damage, but it can help people stay mobile and manage day-to-day problems with options like physical therapy, leg or ankle braces, supportive shoes, pain treatment, and sometimes surgery for foot problems.
Non-drug treatment
Charcot-Marie-Tooth disease type 1D can make walking, balance, hand use, and daily tasks more tiring over time. Supportive therapies can help protect strength, reduce falls, and make movement more efficient, even though they do not cure the nerve problem itself. Care is usually tailored to your symptoms, since weakness, foot shape changes, pain, and fatigue can vary from person to person.
Physical therapy for Charcot-Marie-Tooth disease type 1D often focuses on stretching, balance work, and safe strengthening. This can help with ankle stiffness, tripping, and the day-to-day effort of walking across a parking lot or climbing stairs.
Low-impact activity such as walking, cycling, swimming, or water exercise can help maintain fitness without putting too much strain on weak muscles. Not every approach works the same way, so exercise plans are usually adjusted to avoid overwork and prolonged soreness.
Ankle-foot braces, shoe inserts, and other supports can improve foot position and make each step steadier. For many, treatment begins not at the pharmacy, but with better support for foot drop, high arches, or frequent ankle rolling.
Occupational therapy can make dressing, writing, cooking, and buttoning clothes easier when hand weakness or poor fine-motor control gets in the way. Therapists may suggest hand exercises, splints, or simple tools with larger grips to reduce strain.
Your genes may have an impact on how drugs work for you
For people living with Charcot-Marie-Tooth disease type 1D, treatment usually focuses on symptoms like nerve pain rather than a medicine that fixes the condition itself, and inherited differences can sometimes change how well pain medicines work or how likely side effects are, such as sleepiness, dizziness, or stomach upset. In day-to-day life, this can mean one person gets relief from a standard dose while another feels little benefit or feels too groggy to function comfortably. Even so, there is not a well-established gene-based prescribing rule that is specific to this type of Charcot-Marie-Tooth disease, so doctors usually choose medicines carefully and adjust them based on how each person responds.
Pharmacological treatments
For Charcot-Marie-Tooth disease type 1D, medicines do not correct the underlying nerve problem, but they can help with symptoms that affect daily life, especially pain. Many living with Charcot-Marie-Tooth disease type 1D need medication only for certain problems, such as burning foot pain, aching joints, or troublesome cramps. Not everyone responds to the same medication in the same way. In practice, medications for Charcot-Marie-Tooth disease type 1D are usually chosen based on the symptom causing the most trouble.
Gabapentin and pregabalin are often used for burning, shooting, or electric-like nerve pain. Duloxetine or amitriptyline may also help, especially when pain affects sleep or mood.
Lidocaine patches or capsaicin cream can sometimes ease painful spots in the feet or lower legs. These are applied to the skin and may be useful when pain is more localized.
Acetaminophen or nonsteroidal anti-inflammatory drugs such as ibuprofen and naproxen may help with muscle soreness or joint pain. These medicines do not treat nerve damage itself, but they can help some people stay more comfortable and active.
Mexiletine is sometimes used off-label for frequent, painful muscle cramps in some people with Charcot-Marie-Tooth disease type 1D. Doctors weigh this choice carefully because it is not right for everyone and may need monitoring.
Genetic influences
When walking long distances becomes tiring or small hand tasks like fastening buttons get harder over time, Charcot-Marie-Tooth disease type 1D is usually tied to a change in the EGR2 gene. This subtype is a genetic form of Charcot-Marie-Tooth disease, and it is most often inherited in an autosomal dominant pattern, which means a child can develop it if just one parent carries the altered gene. The EGR2 gene helps nerves form and maintain their protective coating, so when it is altered, signals can travel more slowly and the muscles and sensation in the feet, legs, and hands may be affected. Even with the same gene change, people can have very different symptom patterns and ages at onset, from early symptoms of Charcot-Marie-Tooth disease type 1D in childhood to milder problems that appear later. In some families the gene change is passed down through generations, while in others it can happen for the first time in one person. Because this condition has a clear genetic cause, genetic counseling and testing can help families understand who may be affected and what the results mean for relatives.
Is Charcot-marie-tooth disease type 1d genetic?
Genetics are central to Charcot-Marie-Tooth disease type 1D, because it is caused by a change in the MPZ gene. Different genetic variations can affect how early symptoms of Charcot-Marie-Tooth disease type 1D begin and how severe they become.
Having a genetic risk is not necessarily a diagnosis
Changes in genes are a usual part of being human and are common across the general population. Most of these variants do not directly affect health and simply reflect natural human differences. For many genes, having a variant associated with a condition points to a possible link rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many living with Charcot-Marie-Tooth disease type 1D, treatment is mainly about keeping walking, balance, and hand use as steady as possible with physical therapy, braces, and symptom relief, rather than taking one disease-specific drug. If the pattern of weakness and numbness fits the early symptoms of Charcot-Marie-Tooth disease type 1D, genetic testing can confirm the subtype and help doctors avoid treatments meant for other nerve conditions. Knowing the exact genetic cause can also help families understand inheritance and may make it easier to join research studies, but there is no approved gene-targeted medicine for CMT1D yet. Genetics is only one factor, so doctors also look at pain, fatigue, sleep, other health conditions, and current prescriptions when choosing medicines for cramps or nerve pain. They also review all medications carefully because some drugs can aggravate peripheral nerve damage, which matters in Charcot-Marie-Tooth disease. In day-to-day care, the best plan is usually personalized and adjusted over time as symptoms change.
Interactions with other conditions
Living with Charcot-Marie-Tooth disease type 1D can become more complicated when another illness also affects the nerves, muscles, or balance. Having more than one diagnosis can make symptoms feel harder to untangle. For example, diabetes can add its own nerve damage, so numb feet, burning pain, or weakness may feel worse and may progress faster than expected from Charcot-Marie-Tooth disease type 1D alone. Low vitamin B12, thyroid disease, and long-term heavy alcohol use can also worsen nerve-related symptoms, which is one reason doctors may look for other treatable causes if there is a sudden change. Some people with Charcot-Marie-Tooth disease type 1D also develop common pressure-related nerve problems such as carpal tunnel syndrome, which can add hand tingling, pain, or loss of grip on top of their usual symptoms. If early symptoms of Charcot-Marie-Tooth disease type 1D seem to change quickly, spread in an unusual way, or are joined by new pain or fatigue, it is worth asking whether another condition could be contributing.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Charcot-marie-tooth disease type 1d?
Other inherited nerve conditions, especially other types of Charcot-Marie-Tooth disease, can look a lot like Charcot-Marie-Tooth disease type 1D because they also cause slowly worsening foot weakness, tripping, high arches, and numbness in the lower legs and feet. Doctors also think about more common causes of nerve damage, such as diabetes, low thyroid levels, vitamin B12 deficiency, long-term alcohol use, and a treatable immune-related nerve problem in which the body attacks its own nerves. In some people, muscle conditions or problems in the lower spine can also cause weakness or balance trouble, so the pattern over time, family history, and nerve and genetic tests help sort out the cause.
History
People living with Charcot-Marie-Tooth disease type 1D often spend years trying to make sense of symptoms that may seem ordinary at first, such as frequent ankle sprains, trouble keeping up on long walks, or shoes wearing down unevenly. The story of how doctors came to understand this condition began with those everyday patterns, long before testing could explain why they happened.
In the late 1800s, physicians in Europe described families with slowly progressive weakness and wasting in the lower legs, reduced reflexes, and changes in feeling in the feet and hands. These early reports helped define the broader group now called Charcot-Marie-Tooth disease, named after the doctors who described it. At first, doctors could only group people by what they saw in the clinic, so different forms were often placed together even though they did not all have the same underlying cause.
As medical science evolved, specialists began to notice that some forms of Charcot-Marie-Tooth disease mainly affected the covering around nerves rather than the nerve fiber itself. This led to the term “type 1” for forms with damage to the myelin, the insulating layer that helps nerves send signals quickly and smoothly. For many, this mattered because it explained why symptoms could include both weakness and numbness, and why nerve tests often showed signals moving more slowly than expected.
Charcot-Marie-Tooth disease type 1D was recognized later, once researchers could separate the broader condition into smaller subtypes based on nerve testing, family patterns, and eventually genetic research. Earlier generations may simply have been told they had “hereditary neuropathy” or a general form of Charcot-Marie-Tooth disease. Over time, doctors learned that type 1D is one specific subtype within that larger group, with its own pattern of nerve involvement and its own place in the history of peripheral nerve disorders.
That shift has been important for families. A grandparent who was once described as having weak ankles or “funny walking,” a parent who needed braces, and a child now being evaluated for early symptoms of Charcot-Marie-Tooth disease type 1D may all be part of the same medical story, just understood with much better tools today. Although older descriptions were often incomplete, modern diagnosis has made it easier to identify the condition more accurately, guide care, and connect people with information and support.