What Causes Neuropathy in Legs and Feet? What to Know

Neuropathy in the legs and feet means something has damaged the nerves that carry signals between your feet, legs, spinal cord, and brain. Diabetes is the most common cause in the United States, but it is far from the only one. Many different conditions can produce the same burning, tingling, or numb feeling, and finding the cause is what guides treatment.

The nerves most often affected are the long ones running from your spine down to your toes. Because they are the longest in the body, they tend to show damage first. That is why symptoms usually start in the feet and move upward.

What causes neuropathy in legs and feet?

Damage to peripheral nerves has a long list of possible causes, and sometimes more than one is at work. Doctors call this a “differential diagnosis” — the process of ruling causes in and out. The most common categories include:

• Diabetes and high blood sugar. Sustained high glucose damages small blood vessels that feed nerves and appears to injure the nerves directly. This is called diabetic peripheral neuropathy and is the leading cause in the US.
• Prediabetes and metabolic syndrome. Nerve damage can begin before blood sugar reaches the diabetic range. Some people with prediabetes develop symptoms.
• Vitamin deficiencies. Low vitamin B12 is a well-established cause. Deficiencies in other B vitamins and in vitamin E are also linked to nerve problems.
• Alcohol use disorder. Heavy, long-term drinking causes a nutritional and toxic neuropathy, often through thiamine and B vitamin deficiency.
• Kidney disease. When the kidneys fail to filter waste properly, toxins build up and can damage nerves.
• Thyroid disease. An underactive thyroid is associated with peripheral neuropathy.
• Medications. Certain chemotherapy drugs, some antibiotics, and other medications can be toxic to nerves.
• Infections. HIV, Lyme disease, shingles, and hepatitis C are among the infections linked to nerve damage.
• Autoimmune and inflammatory conditions. Guillain-Barré syndrome, chronic inflammatory demyelinating polyneuropathy (CIDP), lupus, and rheumatoid arthritis can all attack or inflame nerves.
• Inherited conditions. Charcot-Marie-Tooth disease is the most common inherited neuropathy.
• Pressure or injury. A pinched nerve in the spine or a trapped nerve in the leg can cause localized symptoms.
• Idiopathic neuropathy. In a meaningful share of cases, no cause is ever found. Doctors call this idiopathic, and it is a real category, not a failure of testing.

Age matters too. Nerve function tends to decline gradually with age, and older adults are more likely to develop neuropathy from any cause.

Why do symptoms usually start in the feet?

Peripheral nerves are the body’s longest wiring, and the fibers reaching your toes are the most distant from the spinal cord. They depend on a steady blood supply and on the cell body far upstream. When something goes wrong — poor glucose control, a toxin, or a nutritional shortage — the ends of the longest nerves tend to suffer first.

This pattern is called a “length-dependent” or “stocking-glove” distribution. Symptoms begin at the toes and soles, then creep up the feet and lower legs. In many people the hands eventually join in. It is not random: the anatomy of the longest nerves explains the pattern.

What does neuropathy in the feet and legs feel like?

Nerve damage changes how sensations are carried, so people describe it in different ways. Common symptoms include:

• Burning, tingling, or “pins and needles” in the feet and toes
• Numbness or a feeling that the feet are wrapped in something
• Sharp, stabbing, or electric-shock-like pain
• Heightened sensitivity — even a light bedsheet can hurt
• Loss of balance or a feeling of walking on cotton
• Muscle weakness or foot drop in more advanced cases

Symptoms often feel worse at night. That is a common report, though the reasons are not fully settled. Some people have pain without much numbness; others have numbness with little pain. The pattern varies by cause and by person.

One practical point: numbness is not harmless. Loss of feeling in the feet raises the risk of unnoticed cuts, blisters, and burns, which can become serious infections. Foot checks matter.

How do doctors find the cause?

There is no single test that identifies neuropathy’s cause. Diagnosis is a process of elimination guided by your history and exam. A doctor will likely ask about your symptoms, medications, alcohol use, family history, and other health conditions. A physical exam checks sensation, reflexes, muscle strength, and vibration sense.

Common tests include:

• Fasting blood glucose and hemoglobin A1c to screen for diabetes and prediabetes
• Vitamin B12 and other nutritional blood tests
• Kidney and liver function tests
• Thyroid function tests
• Complete blood count and other general labs
• Nerve conduction studies or electromyography (EMG) in some cases to confirm nerve damage and its pattern

Not everyone needs every test. The workup is usually tailored. If a clear cause like diabetes or B12 deficiency turns up, that shapes treatment. If nothing turns up, that is a meaningful finding too — it points toward idiopathic neuropathy or a cause that needs more specialized evaluation.

Can the cause be treated?

Sometimes. When neuropathy has a reversible cause, treating that cause can improve symptoms or stop progression. Examples include correcting a vitamin B12 deficiency, gaining better blood sugar control, stopping a nerve-toxic medication with your doctor’s guidance, or treating an underlying thyroid or kidney problem. This is why finding the cause matters.

For many causes, though, the nerve damage cannot be reversed. The goal shifts to managing pain, protecting the feet, and slowing further damage where possible. The evidence here is genuinely mixed about how much any single intervention helps, and improvement varies widely between people.

Some clinicians recommend medications for nerve pain, including certain antidepressants, anti-seizure drugs, and topical treatments. These are widely used in practice, but response varies and no drug reverses the underlying nerve damage. Physical therapy, balance training, and foot care are commonly part of management. No supplement or device has been shown in large human trials to reverse neuropathy, and marketing claims to that effect are not supported by the evidence.

What can you do to lower your risk?

You cannot control every cause, but some risk factors are modifiable. Keeping blood sugar in a healthy range is the single most important step for people with diabetes or prediabetes, since good control is linked to lower risk of nerve damage. Limiting heavy alcohol use, eating a balanced diet that supports B vitamin intake, and getting regular checkups can help catch reversible causes early.

If you have diabetes, check your feet daily for cuts, blisters, or changes in skin color. Wear well-fitting shoes and avoid walking barefoot, even at home. Report any new numbness, burning, or balance problems to your doctor rather than waiting.

Be cautious with supplements marketed for nerve health. Some contain ingredients with limited or no human evidence behind them. Talk to your doctor before starting anything, especially if you take other medications.

What is the outlook?

Outlook depends heavily on the cause. Neuropathy from a corrected vitamin deficiency or a stopped toxic medication may improve. Diabetic neuropathy often progresses slowly and is generally managed rather than reversed. Idiopathic neuropathy can be stable for years in some people and worsen in others.

The honest position: many cases cannot be cured, but symptoms can often be managed, and some causes can be treated. Early evaluation gives you the best chance of catching a reversible cause. If you have persistent burning, tingling, or numbness in your feet, see a doctor. Your symptoms are real, and they deserve a proper workup.