Learn About Peripheral Neuropathy Information Guide

What Is Peripheral Neuropathy and How Does It Develop

Peripheral neuropathy is a condition that affects the nerves outside your brain and spinal cord. These outer nerves, called peripheral nerves, carry messages between your brain, spinal cord, and the rest of your body. When these nerves become damaged, they cannot send signals properly, leading to weakness, numbness, and pain—usually in your hands and feet.

Your peripheral nervous system has three main types of nerves. Sensory nerves carry feeling and temperature information from your skin to your brain. Motor nerves control your muscles and allow you to move. Autonomic nerves manage functions you don't think about, like heart rate, digestion, and blood pressure. Damage to any of these nerve types can cause different symptoms.

The condition develops when nerve fibers are injured or destroyed. This can happen gradually over months or years, or it can develop more rapidly. The damage often starts in the longest nerves first—those reaching your toes and fingertips. This is why many people notice symptoms in their feet before their hands.

According to the National Institute of Neurological Disorders and Stroke, approximately 20 million Americans have some form of peripheral neuropathy. The condition becomes more common as people age, but it can affect anyone at any age. Children can develop peripheral neuropathy from infections, genetic conditions, or injuries.

Several factors make someone more likely to develop peripheral neuropathy. Diabetes is the leading cause in the United States, affecting about 60 percent of people with diabetes to some degree. Other common causes include infections (like shingles or HIV), injuries, certain medications, vitamin deficiencies, and inherited genetic conditions. Some people develop it from exposure to toxins or from autoimmune diseases where the body's immune system attacks the nerves.

Practical takeaway: Understanding that peripheral neuropathy involves damaged nerves in your extremities and that it develops gradually in most cases can help you recognize early symptoms and seek information about your specific situation.

Recognizing Symptoms and When to Talk to Your Doctor

Symptoms of peripheral neuropathy vary widely depending on which nerves are affected and how severely they are damaged. Many people first notice tingling or a "pins and needles" sensation in their toes or fingers. This feeling often occurs when you wake up or when you've been sitting in one position for a while. Some describe it as similar to how your foot feels when it falls asleep, except the sensation persists.

Numbness is another common early symptom. You might notice you cannot feel textures as clearly as before, or you might not notice when you step on something sharp. Some people report a burning sensation, while others describe their feet as feeling cold even when the temperature around them is warm. Pain in peripheral neuropathy can feel sharp, stabbing, throbbing, or like an electric shock.

Weakness in the arms or legs can develop as motor nerves are affected. This might start as mild weakness in your feet that makes walking feel unsteady or climbing stairs more difficult. Some people drop things more often because their hand strength decreases. In severe cases, weakness can affect your ability to perform daily tasks like buttoning shirts or opening jars.

Autonomic nerve damage can cause different symptoms. You might experience dizziness or lightheadedness when standing up, excessive sweating or an inability to sweat properly, digestive problems like constipation or nausea, and changes in blood pressure. Some people notice their skin becomes dry or shiny, or that their toenails and hair grow differently.

The pattern of symptoms often follows a predictable progression called a "stocking-glove" distribution. Symptoms typically start in your toes and gradually work their way up your legs. At the same time, symptoms may begin in your fingertips and move up your arms. This pattern happens because the longest nerves are affected first.

You should talk to your doctor if you experience unexplained numbness, tingling, or weakness, especially if it persists for more than a few days. Other reasons to seek medical attention include pain in your extremities that interferes with sleep or daily activities, difficulty with balance or coordination, or changes in how your body regulates temperature or digestion. Early medical evaluation can help identify the cause of your symptoms and discuss options for managing them.

Practical takeaway: Knowing the common symptoms of peripheral neuropathy and understanding the stocking-glove pattern of progression can help you describe what you are experiencing to your doctor accurately.

Common Causes and Risk Factors You Should Understand

Diabetes remains the most common cause of peripheral neuropathy in developed countries. When blood sugar levels stay high over long periods, they damage the small blood vessels that nourish your nerves. This process, called diabetic neuropathy, affects about one in four people with diabetes. The good news is that controlling blood sugar levels can slow or prevent the progression of nerve damage.

Infections can trigger peripheral neuropathy during or after the illness. Shingles, caused by the same virus that causes chickenpox, commonly damages the nerves along the path of the rash. HIV and AIDS can damage nerves directly or through medications used to treat the infection. Lyme disease, spread by tick bites, sometimes causes neuropathy. Hepatitis C and other viral infections have also been linked to nerve damage in some cases.

Certain medications used to treat serious conditions can damage nerves as a side effect. Chemotherapy drugs used to treat cancer are known to cause peripheral neuropathy in many patients. Some antibiotics, especially older medications used for tuberculosis, can affect nerves. Antiretroviral medications for HIV, while life-saving, sometimes cause neuropathy. If you are taking medications and develop neuropathy symptoms, do not stop taking your medications without talking to your doctor, as they may have important health benefits that outweigh the side effects.

Nutritional deficiencies damage nerves over time. Vitamin B12 deficiency is particularly important because this vitamin is essential for nerve health. This deficiency can develop from diet, from problems absorbing nutrients in your digestive system, or from certain medications like metformin used for diabetes. Deficiencies in other B vitamins, vitamin E, and minerals like copper can also cause nerve damage.

Other significant causes include autoimmune diseases where your immune system attacks nerve tissues (like Guillain-Barré syndrome), inherited genetic disorders (like Charcot-Marie-Tooth disease, which affects about 1 in 2,500 people), traumatic injuries to nerves, and exposure to toxins. Some people develop neuropathy from working with certain chemicals or pesticides over many years. Heavy alcohol use damages nerves directly and often causes nutritional deficiencies that worsen neuropathy.

Age and family history are important risk factors. Peripheral neuropathy becomes more common after age 60, though it can occur at any age. If family members have had peripheral neuropathy, especially from genetic causes, your own risk may be higher. Kidney disease and liver disease also increase neuropathy risk because these organs help regulate substances that affect nerve health.

Practical takeaway: Identifying which causes and risk factors apply to your situation can help you understand how your neuropathy developed and what information about prevention or management may be relevant to you.

How Doctors Diagnose Peripheral Neuropathy

Diagnosis begins with your doctor asking detailed questions about your symptoms. They will ask when your symptoms started, where you first noticed them, how they have changed over time, and what makes them better or worse. Be specific about what sensations you are experiencing—tingling feels different from burning, and that distinction matters. Tell your doctor about any injuries, illnesses, or medications you have started around the time your symptoms began.

Your doctor will perform a physical examination to test your nerve function. They will check your strength by asking you to push and pull against their hands. They test your sensation using a small tool that pricks your skin lightly to see if you can feel it, or a soft brush to test how well you can detect light touch. Your doctor may also test your reflexes, which rely on proper nerve function. Reflexes often become slower or disappear when peripheral neuropathy is present.

Blood tests can identify some causes of peripheral neuropathy. Tests can measure blood sugar levels and show if diabetes is present. They can check vitamin B12, folate, and other nutrient levels. Blood tests can also detect infections like HIV or hepatitis C,