Peripheral Neuropathy

What is peripheral neuropathy?

Peripheral neuropathy is a condition in which the nerves outside the brain and spinal cord — called the peripheral nerves — are damaged and stop working normally. These nerves carry messages between the brain, the spinal cord, and the rest of the body. They control sensation (what you feel), movement (how your muscles work), and automatic functions such as digestion, blood pressure, and sweating. When peripheral nerves are damaged, these messages can become weakened, distorted, or blocked, which leads to symptoms such as numbness, tingling, pain, or muscle weakness.

If you are asking “what is peripheral neuropathy” after hearing the term from a doctor, it helps to know that it is not a single disease. It is a general description of nerve damage that can have many different causes. The medical code often used for it, ICD-10 G62.9, refers to peripheral neuropathy when a specific cause has not yet been identified.

Peripheral neuropathy is common, particularly in older adults and in people living with diabetes, which is one of its most frequent causes worldwide. It can affect one nerve (mononeuropathy), several nerves in different areas (multiple mononeuropathy), or many nerves at the same time (polyneuropathy). Polyneuropathy — often felt first in the feet and hands — is the most common pattern.

Symptoms of peripheral neuropathy

Peripheral neuropathy symptoms depend on which type of nerve is affected: sensory nerves (feeling), motor nerves (movement), or autonomic nerves (automatic body functions). Many people have a mix of symptoms. Common signs include:

• Numbness or reduced feeling, often starting in the toes and feet and sometimes spreading upward over time
• Tingling or “pins and needles” sensations in the hands or feet
• Burning, stabbing, or electric-shock-like pain, which is often worse at night
• Extreme sensitivity to touch, where even light contact (such as a bedsheet) feels painful
• Muscle weakness, cramps, or twitching
• Loss of balance and coordination, especially when walking in the dark or on uneven surfaces
• Feeling as if you are wearing gloves or socks when you are not
• Autonomic symptoms such as dizziness when standing up, abnormal sweating, digestive problems, bladder difficulties, or changes in heart rate

Symptoms often follow a “stocking and glove” pattern, meaning they begin in the feet and later appear in the hands, because the longest nerves in the body are usually affected first. In early stages, many people notice only mild tingling or occasional numbness. As nerve damage progresses, sensation loss can become more constant, pain may increase, and weakness or balance problems can develop. In advanced stages, some people lose so much feeling in their feet that they do not notice cuts, blisters, or burns — a serious concern, because unnoticed wounds can become infected.

The speed of symptom development also varies. Some neuropathies develop slowly over months or years (common in diabetes), while others appear rapidly over days or weeks, which usually needs prompt medical attention.

Causes and risk factors

There are many possible peripheral neuropathy causes, and identifying the underlying cause is one of the most important steps in managing the condition, because treating the cause can often slow or stop further nerve damage. Well-established causes and risk factors include:

• Diabetes: Long-term high blood sugar is one of the most common causes of peripheral neuropathy worldwide. The risk increases the longer a person has diabetes and the less well blood sugar is controlled.
• Excessive alcohol use: Alcohol can damage nerves directly and is often associated with poor nutrition, which adds to the damage.
• Vitamin deficiencies: Low levels of vitamin B12, and sometimes other B vitamins or vitamin E, can harm nerves. Very high doses of vitamin B6 can also cause nerve damage.
• Autoimmune conditions: Diseases in which the immune system attacks the body’s own tissues — such as Guillain-Barré syndrome, chronic inflammatory demyelinating polyneuropathy (CIDP), lupus, rheumatoid arthritis, and Sjögren’s syndrome — can involve the peripheral nerves.
• Infections: Certain infections, including shingles (herpes zoster), HIV, hepatitis C, and Lyme disease, can affect the nerves.
• Kidney or liver disease: Waste products that build up when these organs do not work well can be toxic to nerves.
• Thyroid problems: An underactive thyroid (hypothyroidism) can contribute to neuropathy.
• Medications and toxins: Some chemotherapy drugs, certain antibiotics, and exposure to heavy metals or industrial chemicals can cause nerve damage.
• Inherited conditions: Some neuropathies, such as Charcot-Marie-Tooth disease, run in families.
• Physical injury or pressure on nerves: Trauma, repetitive motions, or prolonged pressure (as in carpal tunnel syndrome) can damage individual nerves.
• Cancer and abnormal proteins: Some tumors and blood disorders can affect nerves directly or through immune reactions.

In a significant number of people, no clear cause is found even after thorough testing. This is called idiopathic peripheral neuropathy, and it becomes more common with increasing age.

Diagnosis

Peripheral neuropathy diagnosis usually begins with a detailed conversation and a physical examination. Your doctor will ask when the symptoms started, where you feel them, whether they are getting worse, and about your medical history, medications, alcohol use, diet, work exposures, and family history. During the neurological examination, the doctor tests your reflexes, muscle strength, balance, and your ability to feel light touch, vibration, temperature, and pinprick sensations.

To confirm the diagnosis and look for a cause, doctors commonly use the following tests:

• Blood tests: These check for diabetes or prediabetes, vitamin B12 levels, thyroid function, kidney and liver function, signs of inflammation or autoimmune disease, abnormal proteins, and sometimes infections. Blood tests are often the most useful step in finding a treatable cause.
• Nerve conduction studies (NCS): Small electrical pulses are applied to the skin to measure how quickly and strongly nerves carry signals. This test can confirm nerve damage, show which nerves are involved, and indicate whether the damage affects the nerve fiber itself or its insulating cover (myelin).
• Electromyography (EMG): A thin needle electrode records the electrical activity of muscles, helping to distinguish nerve problems from muscle problems.
• Imaging: MRI (magnetic resonance imaging) or CT (computed tomography) scans may be used if the doctor suspects a nerve is being compressed — for example, by a herniated disc in the spine — or to rule out other conditions. Imaging does not diagnose most polyneuropathies but helps exclude structural causes.
• Skin biopsy: In some cases, a very small sample of skin is examined to count the small nerve fibers. This helps diagnose small fiber neuropathy, which standard nerve conduction studies may miss.
• Nerve biopsy: Rarely, a small piece of nerve is removed and examined under a microscope, usually only when an inflammatory or unusual cause is suspected.
• Lumbar puncture (spinal tap): In selected cases, a sample of the fluid around the spinal cord is analyzed, particularly when an inflammatory neuropathy such as Guillain-Barré syndrome or CIDP is suspected.
• Genetic testing: This may be offered when an inherited neuropathy is suspected, especially if there is a family history.

Doctors combine these results with the pattern and timeline of your symptoms to confirm peripheral neuropathy and, whenever possible, identify what is causing it.

Treatment options

Peripheral neuropathy treatment has two main goals: addressing the underlying cause to prevent further nerve damage, and relieving symptoms — especially pain — so that daily life becomes more manageable. There is no single treatment that works for everyone, and your doctor will tailor the plan to your situation. An overview of current approaches is available on the hospital group’s peripheral neuropathy treatment page.

Treating the underlying cause

When a cause is found, treating it is the most important step. For example, careful blood sugar control in diabetes can slow the progression of neuropathy. Vitamin B12 deficiency is treated with supplements or injections. Stopping alcohol use, adjusting or changing a medication that is harming the nerves, treating thyroid disease, or managing an autoimmune condition with immune-modulating therapy can all reduce further damage. In some cases — such as neuropathy caused by a vitamin deficiency caught early — symptoms may improve substantially once the cause is corrected.

Watchful waiting and monitoring

If symptoms are mild and stable, your doctor may recommend regular monitoring rather than immediate medication. This often includes periodic examinations, blood tests, foot checks, and lifestyle measures to protect the nerves and prevent complications.

Medications for nerve pain

Ordinary painkillers such as acetaminophen or ibuprofen often do not work well for nerve pain. Instead, doctors commonly use:

• Anticonvulsants (medications originally developed for epilepsy), such as gabapentin and pregabalin, which calm overactive nerve signals
• Certain antidepressants, such as duloxetine or amitriptyline, which are used for their pain-relieving effect on nerves regardless of mood
• Topical treatments, such as lidocaine patches or capsaicin cream, applied directly to painful areas

These medications reduce pain in many people but rarely eliminate it completely, and they can have side effects such as drowsiness or dizziness. Doses are usually started low and increased gradually. Strong opioid painkillers are generally avoided for long-term nerve pain because of limited benefit and the risk of dependence.

Physical therapy and supportive care

Physical therapy can help maintain muscle strength, improve balance, and reduce the risk of falls. Occupational therapy helps people adapt daily tasks when hand function or sensation is reduced. Braces, orthopedic footwear, canes, or walkers may be recommended for weakness or balance problems. Careful daily foot care is essential for anyone with reduced sensation in the feet.

Procedures and other therapies

For some inflammatory neuropathies, treatments such as intravenous immunoglobulin (antibodies given through a vein), corticosteroids, or plasma exchange (a procedure that filters harmful antibodies from the blood) may be used. Transcutaneous electrical nerve stimulation (TENS), which delivers mild electrical pulses through the skin, helps some people with nerve pain, although evidence varies.

Surgery

Surgery is not a treatment for most polyneuropathies, but it can help when a single nerve is compressed — for example, releasing the trapped nerve in carpal tunnel syndrome, or spinal surgery when a herniated disc is pressing on a nerve root. Your doctor will advise whether a structural, surgically treatable problem is contributing to your symptoms.

Peripheral neuropathy is typically evaluated and managed by neurologists — doctors who specialize in conditions of the nervous system. At Acibadem, this condition is managed within the neurology department, often working together with endocrinology, physical therapy, and pain management specialists when needed.

Living with peripheral neuropathy and outlook

The outlook for peripheral neuropathy depends largely on its cause, how early it is identified, and how well the underlying condition can be controlled. Some neuropathies improve or even resolve when the cause is treated — for example, after correcting a vitamin deficiency or stopping a nerve-damaging medication. Others, such as long-standing diabetic neuropathy, are usually managed rather than cured; the aim is to slow progression, control pain, and prevent complications. Nerves heal slowly, and in cases of severe or long-standing damage, some symptoms may be permanent. No doctor can guarantee a particular outcome, but many people find that their symptoms become manageable with the right combination of treatments.

Day to day, several habits can help protect your nerves and your safety:

• Keep blood sugar within your target range if you have diabetes
• Limit or avoid alcohol
• Eat a balanced diet with adequate B vitamins, and take supplements only as advised by your doctor
• Inspect your feet daily for cuts, blisters, or redness, and wear well-fitting shoes
• Stay physically active within your abilities to maintain strength and circulation
• Reduce fall risks at home, such as loose rugs and poor lighting
• Do not smoke, as smoking reduces blood flow to the nerves

Chronic nerve pain can also affect sleep, mood, and quality of life. If you notice low mood, anxiety, or persistent sleep problems, mention this to your doctor, as treating these issues often improves how well pain is managed overall.

Frequently asked questions

What is peripheral neuropathy in simple terms?

Peripheral neuropathy means the nerves outside the brain and spinal cord are damaged and not sending signals properly. This often causes numbness, tingling, pain, or weakness, most commonly starting in the feet and hands. It is a description of nerve damage rather than a single disease, and it can have many different causes, from diabetes to vitamin deficiencies.

Can peripheral neuropathy be cured or reversed?

It depends on the cause. When the cause is found and treated early — such as a vitamin B12 deficiency or a medication side effect — nerve function can improve, and in some cases symptoms may largely resolve. When nerve damage is severe or long-standing, it is often permanent, and treatment focuses on relieving symptoms and preventing further damage. Nerves regenerate very slowly, so any improvement usually takes months.

How serious is peripheral neuropathy?

Peripheral neuropathy ranges from a mild nuisance to a significantly disabling condition. Its main risks include chronic pain, falls due to poor balance, and unnoticed foot injuries that can become infected — a particular concern for people with diabetes. Some rapidly progressing neuropathies, such as Guillain-Barré syndrome, are medical emergencies. Early evaluation helps identify treatable causes before damage worsens.

What do peripheral neuropathy symptoms feel like at the start?

Early symptoms are often subtle: occasional tingling, “pins and needles,” mild numbness in the toes, or a burning feeling in the feet at night. Some people describe it as walking on cotton or wearing invisible socks. Because early symptoms come and go, they are easy to dismiss, but mentioning them to a doctor early gives the best chance of finding a treatable cause.

What is the most common cause of peripheral neuropathy?

Diabetes is one of the most common causes worldwide, because long-term high blood sugar damages the small blood vessels that supply the nerves. Other frequent causes include heavy alcohol use, vitamin B12 deficiency, certain medications such as some chemotherapy drugs, kidney disease, and autoimmune conditions. In a notable proportion of people, no cause is found despite testing.

How is peripheral neuropathy diagnosed?

Diagnosis usually starts with a detailed history and a neurological examination that tests sensation, strength, and reflexes. Blood tests look for causes such as diabetes, vitamin deficiencies, and thyroid or kidney problems. Nerve conduction studies and electromyography measure how well the nerves and muscles work electrically. In selected cases, doctors may add imaging, a skin biopsy, a lumbar puncture, or genetic testing.

How long does recovery from peripheral neuropathy take?

When recovery is possible, it is typically slow, because peripheral nerves regrow at a rate of roughly a millimeter a day at best. Improvement after treating the underlying cause may take several months to a year or more, and progress is often gradual. Your doctor can give you a more realistic timeline based on the cause, the severity of the damage, and how your symptoms respond to treatment.

When to see a doctor

Make an appointment with a doctor if you notice persistent tingling, numbness, burning, or weakness in your hands or feet, especially if the symptoms are spreading or interfering with sleep, walking, or daily activities. Early evaluation gives the best chance of identifying and treating the cause before nerve damage progresses.

Seek urgent medical care if you experience any of the following red-flag warning signs:

• Rapidly worsening weakness in the legs or arms over hours or days, which can signal a serious condition such as Guillain-Barré syndrome
• Difficulty breathing or swallowing along with weakness or numbness
• Sudden loss of bladder or bowel control, or numbness in the groin or inner thighs
• A foot wound, ulcer, or infection that you cannot feel or that is not healing, particularly if you have diabetes
• Severe dizziness or fainting when standing, which may indicate autonomic nerve involvement
• Numbness or weakness after an injury to the back, neck, or a limb
• Symptoms appearing suddenly on one side of the body, which needs urgent assessment to rule out a stroke

Even without these urgent signs, do not ignore gradually worsening numbness or pain. Peripheral neuropathy is often easier to manage — and sometimes partly reversible — when the cause is found early, so timely medical evaluation matters.