Peripheral neuropathy happens when the nerves located outside the brain and spinal cord become damaged, leading to a range of symptoms that can affect daily life, from tingling sensations in the feet to difficulty walking and chronic pain that disrupts sleep and activities.

Understanding Peripheral Neuropathy

Peripheral neuropathy refers to conditions that affect the nerves outside your brain and spinal cord, which make up what is called the peripheral nervous system. Think of your nervous system as a complex messaging highway. Your brain and spinal cord form the central command center, while peripheral nerves are like communication cables running throughout your body, carrying signals back and forth. When these cables become damaged or start malfunctioning, the messages they carry can become confused, incomplete, or painful.^[1]

The peripheral nervous system includes different types of nerves that each have specific jobs. Sensory nerves transmit information about sensations like touch, temperature, and pain from your skin to your brain. Motor nerves control muscle movement, allowing you to walk, grasp objects, and speak. Autonomic nerves regulate automatic functions that you don’t consciously think about, such as breathing, heart rate, digestion, and blood pressure.^[2]

Peripheral neuropathy can affect one nerve, several nerves, or many nerves throughout the body. The most common form is called polyneuropathy, which means many nerves are affected. This type typically starts by affecting the longest nerves first, which is why symptoms usually begin in the feet. Over time, the condition may gradually spread upward, eventually affecting the hands as well.^[3]

How Common Is Peripheral Neuropathy

Peripheral neuropathy is quite common, affecting approximately 2.4% of people worldwide. However, the condition becomes significantly more prevalent as people age. Among individuals aged 45 and older, the percentage rises to between 5% and 7%. In the United Kingdom, it’s estimated that nearly 1 in 10 people aged 55 or over are affected by peripheral neuropathy.^[5][7]

The condition affects more than 20 million Americans, making it a significant health concern. The high prevalence is partly because peripheral neuropathy is not a single disease but rather an umbrella term that covers many different conditions affecting peripheral nerves. Anyone can develop peripheral neuropathy regardless of age, sex, race, or ethnicity, though certain groups face higher risks depending on underlying health conditions.^[4][10]

What Causes Peripheral Neuropathy

Peripheral neuropathy can result from a wide variety of causes. In the United States and United Kingdom, diabetes is the most common cause, eventually affecting about half of all people with this condition. When blood sugar levels remain high over extended periods, they can damage nerves and the small blood vessels that nourish them. This type of nerve damage is specifically called diabetic polyneuropathy.^[1][5]

Beyond diabetes, many other health conditions can lead to peripheral neuropathy. These include thyroid problems, particularly an underactive thyroid gland called hypothyroidism. Vitamin deficiencies, especially of vitamins B1, B6, B12, and vitamin E, can damage nerves over time. Inflammatory conditions such as rheumatoid arthritis, lupus, and various forms of vasculitis can also affect peripheral nerves.^[6][7]

Infections can trigger peripheral neuropathy as well. These include Lyme disease, shingles, hepatitis C, HIV infection and AIDS, and Epstein-Barr virus. A condition called Guillain-Barré syndrome, which involves the immune system attacking the nerves, can cause rapidly developing neuropathy. Additionally, exposure to toxic substances like heavy metals and certain chemicals can damage peripheral nerves.^[7]

Physical trauma to nerves from accidents, pressure on nerves (as seen in carpal tunnel syndrome), or prolonged pressure from casts, braces, or crutches can lead to neuropathy. Certain medications, particularly some chemotherapy agents, antibiotics, and cardiovascular medications, may cause nerve damage as a side effect. Long-term excessive alcohol consumption is another significant cause of peripheral neuropathy.^[4][7]

Some inherited conditions can cause peripheral neuropathy, including Charcot-Marie-Tooth disease, which affects nerves in the arms, hands, legs, and feet, and Friedreich ataxia, which slowly damages the nervous system. Tumors and cancers can cause neuropathy either by pressing directly on nerves or through associated paraneoplastic syndromes, which are conditions triggered by the immune system’s response to cancer.^[7]

In some cases, despite thorough evaluation, doctors cannot identify a specific cause for peripheral neuropathy. These cases are called idiopathic peripheral neuropathy, and they can make treatment more challenging since the underlying trigger remains unknown.^[13]

Risk Factors for Developing Peripheral Neuropathy

Certain factors increase the likelihood of developing peripheral neuropathy. Age is a significant risk factor, as peripheral neuropathy is very common with some age-related diseases, meaning the risk increases as you get older. Advanced age itself makes people more susceptible to nerve damage.^[7]

Having a family history of neuropathy increases risk, particularly in families where diabetes runs. Nutritional status plays an important role as well. Malnourishment and specific vitamin deficiencies create conditions where nerves cannot function properly. Excessive and prolonged alcohol use damages nerves both directly and by interfering with vitamin absorption.^[7]

Pre-existing medical conditions significantly elevate risk. People with diabetes face the highest risk of developing peripheral neuropathy. Those with autoimmune diseases like Sjögren syndrome, lupus, or rheumatoid arthritis also have increased vulnerability. Kidney disease, certain infections, and blood disorders raise the chances of nerve damage. People with monoclonal gammopathy of undetermined significance (MGUS) and multiple myeloma are at higher risk as well.^[7]

Occupational and lifestyle factors matter too. People whose work involves repetitive motions or who maintain poor posture for extended periods may develop nerve compression leading to neuropathy. Exposure to toxins in certain work environments increases risk. Smoking can affect blood flow to peripheral nerves, contributing to damage over time.^[17]

Recognizing the Symptoms

The symptoms of peripheral neuropathy vary widely depending on which types of nerves are affected and how severely. Since most neuropathies affect all three types of nerve fibers to varying degrees, people often experience a combination of symptoms. However, symptoms usually depend most heavily on the predominant type of nerve damage.^[3]

When sensory nerves are damaged, people typically experience a gradual onset of numbness, prickling, or tingling sensations in their feet or hands. Many describe it as a feeling of “pins and needles.” These sensations can spread upward into the legs and arms over time. Some people experience sharp, jabbing, throbbing, or burning pain that can be severe. The pain is often worse at night, making sleep difficult. Others develop extreme sensitivity to touch, where even light contact with clothing or bedsheets becomes painful.^[1]

Temperature sensation can become unreliable. Some people cannot accurately sense hot or cold, which creates risks of burns or frostbite. Others feel unusually sensitive to temperature changes. The loss of protective pain sensation in the feet is particularly dangerous because injuries like cuts, blisters, or sores may go unnoticed and become infected.^[4]

Motor nerve damage causes different problems. Muscle weakness, especially in the feet or hands, makes it difficult to perform fine motor tasks like buttoning clothing or picking up small objects. People may experience muscle twitching or cramps. Loss of balance and coordination becomes common, particularly in the dark when visual cues cannot compensate for reduced sensation in the feet. This increases the risk of falls, which can lead to serious injuries like hip fractures.^[4][6]

When autonomic nerves are damaged, the effects can be more serious because these nerves control unconscious bodily functions. Digestive problems may develop, including feeling full faster when eating, constipation, or diarrhea. Bladder function can be affected, leading to difficulty urinating or loss of bladder control. Some people experience sexual dysfunction, including erectile dysfunction in men. Changes in sweating patterns occur, with some areas sweating excessively while others produce no sweat at all.^[1]

Autonomic neuropathy can also affect heart rate and blood pressure regulation. People may feel lightheaded or dizzy, especially when standing up from a sitting or lying position. In severe cases, this can lead to dangerous drops in blood pressure or respiratory and heart problems.^[4]

The symptoms of peripheral neuropathy are usually constant, though they may come and go in some people. Early symptoms are sometimes dismissed as minor annoyances, but recognizing them early and seeking medical attention is important to prevent progression and complications.^[5]

Prevention Strategies

While not all cases of peripheral neuropathy can be prevented, especially those caused by inherited conditions, many cases can be avoided or their progression slowed through lifestyle modifications and proper management of underlying health conditions.^[5]

For people with diabetes, maintaining good blood sugar control is the single most important preventive measure. This involves monitoring blood glucose levels regularly, taking medications as prescribed, eating a balanced diet, and staying physically active. Keeping blood pressure and cholesterol levels within healthy ranges also helps protect nerves from damage. People with diabetes should have regular check-ups to assess nerve function so any early signs of neuropathy can be detected and addressed promptly.^[1]

Nutrition plays a vital role in nerve health. Eating a diet rich in vitamins, particularly the B vitamins (B1, B6, B12), vitamin E, and other antioxidants supports proper nerve function. Foods that provide these nutrients include whole grains, lean proteins, fruits, vegetables, nuts, and seeds. For people with identified vitamin deficiencies, supplements may be recommended under medical supervision.^[7]

Limiting or avoiding alcohol is crucial for preventing alcohol-related neuropathy. Excessive alcohol use damages nerves both directly through toxic effects and indirectly by interfering with nutrient absorption. Similarly, avoiding exposure to toxic chemicals and heavy metals in occupational or home environments protects against toxic neuropathy.^[7]

Regular physical activity benefits nerve health in multiple ways. Exercise improves blood circulation, ensuring that peripheral nerves receive adequate oxygen and nutrients. It helps maintain healthy blood sugar levels, blood pressure, and body weight. Exercise also supports muscle strength and coordination, which can help compensate for some effects of neuropathy if it does develop. Activities should be chosen carefully to avoid repetitive stress or trauma to already vulnerable nerves.^[17]

Protecting against infections that can cause neuropathy is another preventive strategy. This includes practicing safe behaviors to avoid HIV and hepatitis C, getting vaccinated against shingles when appropriate, and seeking prompt treatment for infections like Lyme disease. Managing autoimmune conditions with appropriate medical care can help prevent or minimize nerve damage from inflammation.^[7]

Being aware of medications that can cause neuropathy as a side effect allows for informed discussions with healthcare providers. If neuropathy develops during treatment with certain medications, sometimes the medication can be changed or the dose adjusted to prevent worsening nerve damage. However, this decision must always be made by a healthcare professional weighing the benefits and risks.^[5]

Workplace ergonomics and proper body mechanics can prevent nerve compression injuries. Using correct posture, taking regular breaks from repetitive tasks, and ensuring workstations are properly set up all reduce the risk of developing compression neuropathies like carpal tunnel syndrome. Avoiding prolonged pressure on nerves from tight clothing, crossing legs for extended periods, or leaning on elbows helps protect peripheral nerves.^[17]

How Peripheral Neuropathy Affects the Body

Understanding how peripheral neuropathy affects the body requires knowing a bit about nerve cell structure. Nerves are made up of specialized cells called neurons. Each neuron consists of a cell body, which is the main part of the cell, and an axon, a long arm-like extension that carries signals away from the cell body. At the end of the axon are finger-like extensions called synapses where signals are transmitted to nearby nerve cells.^[2]

Neurons also have small branch-like extensions on the cell body called dendrites, which receive signals from other neurons. Many nerve fibers are covered with a protective coating called myelin, a thin layer made of fatty compounds that insulates the nerve and helps electrical signals travel quickly and efficiently along the nerve fiber.^[2]

Peripheral neuropathy disrupts this signaling system in three main ways. First, signals that should be sent aren’t transmitted properly. Second, signals are sent when they shouldn’t be, creating false sensations. Third, errors occur that change the messages being communicated between the body and brain. These disruptions can happen because the axon itself is damaged, because the myelin coating is destroyed, or both.^[3]

When sensory nerves malfunction, the result is abnormal or absent sensation. Damaged nerves may send constant pain signals to the brain even though no injury is present, causing chronic pain. Conversely, when nerves cannot transmit warnings about actual injuries or dangerous temperatures, people lose the protective function of pain and may unknowingly harm themselves.^[1]

Motor nerve damage interrupts the signals that tell muscles to contract and relax. Without proper nerve signals, muscles cannot function normally. They may become weak and eventually waste away from disuse, a condition called muscle wasting or atrophy. Coordination becomes impaired because the brain cannot receive accurate information about body position or send precise instructions for movement.^[4]

Autonomic nerve dysfunction disrupts the automatic regulation of internal organs and systems. The heart may not adjust its rate properly in response to activity or position changes. The digestive system may move food too slowly or too quickly through the intestines because nerve signals that coordinate muscle contractions in the gut are disrupted. The bladder may not empty completely or may empty at inappropriate times. These effects occur because the nerves that usually manage these functions without conscious effort are not working correctly.^[1]

Most peripheral neuropathies are “length-dependent,” meaning the longest nerves are affected first and most severely. This is why symptoms typically start in the toes and feet, which are farthest from the spinal cord. As the condition progresses, it gradually affects shorter nerves, so symptoms seem to spread upward toward the body’s center. In severe cases, the hands eventually become affected as well because the nerves serving them are also quite long.^[3]

The peripheral nervous system has some capacity to heal and regenerate, unlike the central nervous system. When the underlying cause of neuropathy is identified and treated, some people experience recovery as their nerves slowly repair themselves. However, this process takes a very long time, often many months to years, and recovery is not always complete. In some situations, particularly when nerves have been damaged by radiation or certain chemotherapy drugs, recovery is limited.^[11]