Numbness in feet has many possible causes, and the pattern often tells you more than the feeling itself. Which foot is affected, when it happens and what makes it worse can point toward nerve damage, a squeezed nerve or a blood-flow problem.
Below are the main causes and how to compare them. They often overlap, especially with diabetes.
Numbness in feet that lasts or keeps coming back is most often caused by peripheral neuropathy, damage to the nerves reaching the feet, and diabetes is the leading cause in the US. Low B12, alcohol, medicines, pinched nerves and poor circulation are other causes. Numbness in both feet usually points to nerve damage, though the lower spine can be involved; one foot more often suggests nerve pressure or a blood-flow problem.
Call 911 if numbness comes on suddenly with face drooping, arm weakness or slurred speech; if a foot suddenly turns cold, pale and painful; if you have numbness around the genitals or new loss of bladder or bowel control; if weakness spreads quickly up your legs; or if numbness starts right after a head, neck or back injury.
Why are my feet numb? Three basic mechanisms
Numbness in the feet usually comes from one of three problems.
- Nerve damage (neuropathy). Most neuropathies hit the longest nerves first, so symptoms usually start or are worst in the feet and can spread upward.
- Nerve pressure. A nerve squeezed at the ankle, knee or lower back goes numb in the area it supplies, often on one side.
- Reduced blood flow. Narrowed leg arteries or cold-triggered spasms in small vessels can cause numbness, often with color or temperature changes.
Causes of numbness in feet, one by one
Diabetes and prediabetes
Diabetes is the leading cause of peripheral neuropathy in the US. The NIDDK estimates that up to half of people with diabetes have peripheral neuropathy. The American Diabetes Association advises yearly monofilament foot testing for everyone with diabetes.
About 115.2 million US adults have prediabetes. A 2025 meta-analysis found an association between prediabetes and measurable nerve changes, and an American Academy of Neurology guideline says a glucose tolerance test may be considered when routine blood sugar is normal.
Clue: both feet, gradual, often with burning or tingling. Tests: HbA1c, fasting glucose, sometimes a glucose tolerance test. More on how diabetic neuropathy develops.
Low vitamin B12
B12 deficiency is one of the best-known vitamin-related causes of neuropathy. It is more likely with older age, a strict vegan diet, stomach or bowel surgery, or long-term metformin or proton pump inhibitors, a common acid reducer. In a meta-analysis of 31 studies, metformin users had about twice the risk of low B12, though no clear link to neuropathy itself. Don't stop metformin; ask your prescriber whether a B12 check makes sense.
Clue: both feet, sometimes hands, with fatigue or balance trouble. Tests: serum B12 plus methylmalonic acid, a marker that helps confirm deficiency.
Alcohol
Long-term heavy drinking can harm nerves directly and through low thiamine (vitamin B1). It usually starts as numbness, pain and pins and needles in both feet. If you drink heavily and want to cut back or stop, ask a doctor for support first, because severe alcohol withdrawal can cause seizures and delirium. SAMHSA's National Helpline, 1-800-662-HELP (4357), is free, confidential and available 24/7.
Medicines, chemotherapy and too much vitamin B6
The NHS lists medicines linked to neuropathy, including some chemotherapy drugs, metronidazole or nitrofurantoin taken for months, long-term phenytoin (a seizure medicine) and amiodarone (a heart rhythm medicine).
High vitamin B6 levels, usually from supplements, can cause a mainly sensory neuropathy, and people often report improvement after stopping. B6 appears in multivitamins, B-complex products and many nerve formulas, so add up the amounts. Clue: symptoms began after a new drug or supplement. Never stop a prescribed medicine without talking to your prescriber.
Peripheral artery disease and poor circulation
Peripheral artery disease (PAD) is narrowing of the leg arteries by plaque, and more than 8 million Americans aged 40 and older have it. The classic sign is leg pain or weakness with walking that stops within minutes of rest, but only about 1 in 4 people with PAD have it. As PAD advances, the foot may feel numb at rest and look pale or bluish.
Clue: a cool foot, leg pain with walking, smoking or diabetes. Tests: an ankle-brachial index, which compares blood pressure at the ankle and arm; in diabetes, toe pressures tend to be more accurate. See these signs of poor circulation in the legs.
Nerve compression: ankle, knee, lower back and tight shoes
Tarsal tunnel syndrome is pressure on the tibial nerve at the inner ankle. It causes numbness, burning or shooting pain in the sole that may worsen at night, with long standing or walking, or after activity. It often affects one foot.
Peroneal nerve pressure at the outer knee, often from crossing your legs, can cause numbness on the top of the foot and sometimes foot drop, where the toes catch or drag. More on the peroneal nerve and leg movement.
Sciatica is irritation of the sciatic nerve, most often from a slipped disc. It usually affects the buttock and back of one leg, often reaching the foot. Lumbar spinal stenosis, a narrowing of the spinal canal, can cause numbness, tingling or cramping in the legs and feet that worsens with standing or walking and eases when you lean forward or sit.
Pressure from position, such as sitting on your foot, briefly cuts off blood supply to nerves, and the resulting pins and needles lasts only a few minutes. Tight laces can press on the top of the foot too.
Cold and Raynaud's phenomenon
In Raynaud's, cold or stress narrows small blood vessels in the fingers and toes. The skin turns white, then blue, cold and numb, then red with tingling or throbbing as blood returns.
Thyroid and kidney disease
Hypothyroidism is a recognized cause of neuropathy. In a UK Biobank analysis, diagnosed hypothyroidism was linked to 29% higher odds of peripheral neuropathy, and the link remained when people with diabetes were excluded. That is an association, not proof of cause. Kidney disorders can also cause neuropathy, and most people on dialysis develop some form of it. Clue: both feet, gradual. Tests: TSH, plus creatinine and eGFR for kidney function.
Multiple sclerosis and other brain or spinal cord causes
In MS, the immune system attacks the protective coating of nerves in the brain and spinal cord, not the nerves in the foot. It usually begins between ages 20 and 40, and symptoms often come in episodes that partly or fully clear.
Less common causes, and when no cause is found
Other causes include lupus, rheumatoid arthritis, Sjögren's, celiac disease, abnormal blood proteins (such as MGUS) and inherited neuropathies. In three hospital studies, no cause was identified for 12% to 28% of neuropathies (idiopathic axonal neuropathy), a type that usually has a benign course.
Pattern clues: how to tell the causes apart
These patterns are clues, not a diagnosis, but they help you organize what you tell your doctor.
| If your numbness is.. | Causes to consider first |
|---|---|
| In both feet, starting at the toes and slowly climbing | Neuropathy from diabetes, prediabetes, low B12, alcohol, medicines, thyroid or kidney disease |
| In one foot only | Tarsal tunnel syndrome, sciatica, peroneal nerve pressure at the knee (top of foot, sometimes foot drop), PAD in that leg |
| In the bottom of the foot | Early neuropathy (both feet); tarsal tunnel syndrome or sciatica (one foot) |
| Worse after standing or walking | Lumbar spinal stenosis (eases with sitting or leaning forward); tarsal tunnel syndrome; PAD if leg pain eases with rest |
| Worse at night | Neuropathy; tarsal tunnel syndrome |
| With back or buttock pain running down the leg | Sciatica or another pinched nerve root |
| Only in cold or stress, with white or blue toes | Raynaud's phenomenon |
| After sitting on your foot, gone in minutes | Temporary nerve pressure |
| Started after a new medicine or supplement | Drug- or vitamin B6-related neuropathy |
| In episodes, age 20 to 40, with vision or bladder changes | Multiple sclerosis |
| Sudden, with face, arm or speech changes, or a cold, pale foot | Stroke or blocked blood flow: call 911 |
Numbness in bottom of feet: what it usually means
If the bottom of both feet is numb, early neuropathy is a common explanation, since the soles sit at the far end of the longest nerves. If one sole is numb, especially with burning near the inner ankle, ask about tarsal tunnel syndrome. For the wider picture, see these symptoms of neuropathy in the feet. If numbness is worst at night, these tips on sleeping with neuropathy may help.
Feet going numb when you sit, stand or walk
Feet going numb while sitting usually means temporary pressure. With standing or walking, numbness that eases when you sit or lean forward suggests spinal stenosis, burning at the inner ankle suggests tarsal tunnel syndrome, and leg pain that settles with rest, even standing, suggests PAD. Pins and needles that keeps coming back deserves a visit.
Why do my feet feel numb and tingly?
Numbness is reduced feeling; tingling is a pins-and-needles sensation. Many neuropathies cause both. In diabetes, small-fiber damage tends to cause early burning and tingling, while large-fiber damage causes numbness and balance problems. For a broader look, see what causes tingling in hands and feet.
Tests doctors use to find the cause of numb feet
History, exam, nerve tests and lab work together find the cause in up to 4 of 5 people. The highest-yield blood tests are glucose, B12 with methylmalonic acid, and serum protein immunofixation.
| Test | What it looks for |
|---|---|
| Monofilament, tuning fork, pinprick | Loss of protective feeling and vibration sense |
| HbA1c, glucose, glucose tolerance test | Diabetes or prediabetes |
| B12 with methylmalonic acid | B12 deficiency |
| Serum protein immunofixation | Abnormal blood proteins such as MGUS |
| TSH, kidney and liver tests, blood count | Thyroid, kidney or liver disease; anemia |
| Nerve conduction study and EMG | Whether nerves are damaged, what type and how severely |
| Ankle-brachial index, toe pressures | Peripheral artery disease |
| MRI of the lower spine | Pinched nerve root or spinal stenosis |
| Skin biopsy | Small fiber neuropathy when nerve conduction is normal |
When to see a doctor about numb feet
Call 911 or go to the emergency room
- Sudden numbness or weakness on one side of the body, face drooping, slurred speech, confusion or vision loss, even if symptoms stop. These can be signs of stroke.
- Numbness around the genitals or anus, new trouble controlling your bladder or bowels, or severe or worsening numbness or weakness in both legs. These can signal cauda equina syndrome, a spinal nerve emergency.
- Numbness or tingling that starts just after a head, neck or back injury, or numbness with new weakness or trouble moving a leg.
- A foot or leg that suddenly becomes painful, pale, cold, numb or hard to move. This can mean acute limb ischemia, and permanent damage may occur within 4 to 6 hours.
- Tingling in the feet or hands followed by weakness that spreads over hours or days, or any trouble breathing, which can be Guillain-Barré syndrome.
Get care the same day or within a few days
- Same day: diabetes or reduced foot feeling plus a sore, blister, cut, redness, swelling or drainage. If there is also fever, fast-spreading redness or skin turning black, go to the emergency room.
- Same day: leg or foot pain even at rest, or a foot that has gradually become cool, pale, bluish or numb. In severe PAD, pain at rest is called critical limb ischemia. If the change comes on suddenly, call 911.
- New foot drop, where your toes catch or your foot slaps when you walk.
- Numbness or weakness that is clearly worsening over days to weeks.
- New numbness during or after chemotherapy: call your oncology team.
Book a routine appointment
- Numbness that is constant or keeps coming back, or slowly spreads in both feet.
- Diabetes: a yearly foot exam even without symptoms. On long-term metformin, ask about a B12 check.
What you can do while you look for the cause
- Check your feet every day for cuts or scratches, including the soles.
- Wear shoes inside and outside, and ask someone to check bath water temperature.
- Note when numbness started, which foot, and what makes it worse, and list every medicine and supplement, including B6 amounts.
- Don't stop any prescribed medicine on your own, and ask your clinician about testing before you start any vitamin or supplement. During cancer treatment, check with your oncology team first; ASCO guidance discourages acetyl-L-carnitine for preventing chemotherapy nerve damage.
Also review these common neuropathy triggers in the feet.
Where Neuro-Blast fits
Supplements don't diagnose or treat the cause of numb feet or replace medical care.
Neuro-Blast capsules are formulated with PEA, alpha-lipoic acid and B vitamins to support healthy nerve function, and the Neuro-Blast oral spray is also sold on its own, with its own label. In the capsules, each two-capsule serving contains 40 mg of vitamin B6. That is below the U.S. adult upper limit of 100 mg a day but above the 10 mg a day from supplements the NHS advises without a doctor's recommendation, so ask your clinician before starting, count the B6 in everything you take, and stop and call your clinician if new numbness or tingling begins. Alpha-lipoic acid in the capsules may lower blood sugar with diabetes medicine. The spray contains acetyl-L-carnitine, so ask your oncologist before using it during chemotherapy.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Frequently asked questions
Why are my feet numb all of a sudden?
Brief numbness after sitting on your foot fades within minutes. Sudden numbness with face, arm or speech changes, a cold and pale foot, loss of bladder or bowel control, quickly spreading weakness, or numbness right after a head, neck or back injury is an emergency. Call 911.
When should I worry about numbness in my feet?
Call 911 for sudden numbness with warning signs such as face, arm or speech changes. Get same-day care for a foot sore with diabetes or foot pain at rest. Book a visit if numbness keeps returning, spreads or worsens.
What does it mean when the bottom of your feet is numb?
In both feet, it is often an early sign of peripheral neuropathy, since the soles sit at the end of the longest nerves. In one foot, tarsal tunnel syndrome or a pinched nerve in the lower back is possible.
What vitamin deficiency causes numbness in feet?
Low vitamin B12 is the best-known vitamin-related cause, and low thiamine (B1) can contribute in people who drink heavily. Too much vitamin B6 from supplements can also cause numb feet. If you think a vitamin level may be off, ask your clinician about a blood test before taking any supplement.
Is numbness in feet caused by poor circulation or nerves?
It can be either, and both often occur together in diabetes. Circulation problems tend to cause leg pain with walking that eases with rest, plus a cool or pale foot. Nerve problems tend to cause numbness, tingling or burning that starts in the toes.
This article is for general education and is not a substitute for personalized medical advice. Talk with your healthcare provider about your symptoms and before starting any supplement.
