Symptoms
Numb feet: causes, patterns, and when it’s serious
Numb feet are usually a nerve problem, sometimes a back or circulation problem, and occasionally an emergency. Where the numbness sits, whether it is on one side or both, and how fast it arrived tell you which, far more than the sensation itself.
Written by the Managing Neuropathy editorial team under the direction of Dr. Tom Biernacki, DPM, FACFAS · Clinical review pending · Last updated 24 September 2026
The short answer. Numbness in both feet that starts in the toes and creeps upward over months is usually peripheral neuropathy. Diabetes is the commonest cause, and several others are treatable, which is why the cause is worth finding. Numbness in one foot or one patch points to a squeezed nerve, the lower back or circulation. Sudden numbness, especially with weakness, a cold pale foot, or bladder changes, needs emergency care.
Is foot numbness dangerous?
Most numb feet are not an emergency. A few patterns are, so they come first.
Call 911 or go to the emergency department for:
- sudden numbness or weakness in a leg, arm or the face, especially on one side, or trouble speaking (possible stroke);
- a foot that suddenly turns cold, pale or blue, and painful as well as numb (possible blocked artery);
- numbness and weakness climbing both legs over hours or days (possible Guillain–Barré syndrome);
- numbness around the groin or bottom, new trouble controlling your bladder or bowels, or severe or worsening weakness in both legs (possible compression of the nerves at the base of the spine).
Be seen the same day or the next if a numb foot has a wound, blister or crack with redness, warmth, swelling or fever. The same goes for a foot that becomes warm, red and swollen without an injury, which in someone with neuropathy can be Charcot foot, a weakening of the foot bones.
The slower danger is the one most people miss. A numb foot cannot warn you about a stone in your shoe, a seam that rubs or water that is too hot. Small injuries go unnoticed until they are serious, which is how most foot ulcers begin. That is why the next step, even for mild numbness, is to start looking at your feet every day. The daily foot check takes two minutes.
Why are my feet numb? The causes worth identifying
Numbness is a symptom, and the list of causes is long. These are the ones worth ruling in or out, with the pattern each tends to produce.
| Cause | Typical pattern | How it is usually found |
|---|---|---|
| Diabetes or prediabetes | Both feet, toes first, spreading slowly upward | Blood glucose and HbA1c |
| Low vitamin B12 | Both feet, sometimes the hands; can appear before any anemia | B12 level, ideally with methylmalonic acid |
| Too much vitamin B6 | Both feet, in someone taking high-dose supplements | Reading supplement labels; a B6 level |
| Alcohol | Both feet, gradual | History |
| Thyroid or kidney disease | Both feet | Thyroid and kidney blood tests |
| Medicines, including some chemotherapy | Both feet, after starting the drug | Medication review |
| Abnormal blood proteins (paraproteins) | Both feet | Serum protein immunofixation |
| A pinched nerve root in the lower back | One leg, often with back or buttock pain | Examination; imaging if needed |
| A nerve squeezed at the knee, ankle or foot | One foot, or one patch of it | Examination; sometimes nerve tests or imaging |
| Poor circulation (peripheral arterial disease) | Cold or pale feet; calf pain on walking that eases with rest | Foot pulses; ankle-brachial index |
| Pressure or tight shoes | Comes and goes with position or footwear | It resolves when the pressure does |
For numbness that is symmetric, affecting both feet evenly, an evidence review by the American Academy of Neurology found three screening blood tests with the highest yield: blood glucose, vitamin B12 with its metabolite methylmalonic acid, and serum protein immunofixation. The American Diabetes Association adds thyroid and kidney disease, alcohol, certain medicines and B12 deficiency from metformin to the list of causes to consider even in people who do have diabetes.
Numbness by location
The top of the foot
Numbness across the top of one foot, on its own, is rarely polyneuropathy. Most of the top of the foot is supplied by the superficial peroneal nerve, which can be irritated where it passes through the fascia on the outer side of the lower leg, or by an ankle injury. The skin between the big toe and second toe belongs to the deep peroneal nerve, which runs under the front of the ankle. Tight shoes, boots and straps can compress it there, a problem called anterior tarsal tunnel syndrome. Numbness over the top of the foot and big toe that travels with back or leg pain points higher, to a nerve root in the lower back.
The sole
The sole is supplied by branches of the tibial nerve, which passes behind the inner ankle bone. Numbness or burning across the sole of one foot, worse with standing, suggests it is being squeezed there. That is tarsal tunnel syndrome. Numbness across both soles is more often the start of a peripheral neuropathy, because the soles and toes are where the longest nerves end.
The toes
Both sets of toes going numb together is the classic first sign of a length-dependent neuropathy. Numbness between the third and fourth toes, often with a feeling of a pebble under the ball of the foot, suggests a Morton’s neuroma. One numb big toe is usually pressure from a shoe or a bunion. Numb toes have their own guide.
The outer edge of the foot
The outer border of the foot and the little toe are supplied by the sural nerve, which runs behind the outer ankle bone. Numbness there alone suggests a problem along that nerve, such as an old ankle injury, or a nerve root in the lower back, rather than neuropathy.
One foot or both
This is the single most useful question. Numbness that is symmetric, the same in both feet, points to something affecting the whole body: a metabolic, nutritional or toxic cause. Numbness in one foot points to something local: a nerve squeezed somewhere along its route, the back, or blood flow to that leg.
Numb and tingling, numb and burning: what the combination tells you
- Numb and tingling in both feet is the typical picture of peripheral neuropathy affecting several kinds of nerve fiber. What tingling means on its own.
- Numb with burning, worse at night suggests the small nerve fibers are involved. Small fiber neuropathy is covered here, and so is burning at night.
- Numb and weak, especially with the front of the foot dropping or catching when you walk, needs prompt assessment. Here is why.
- Numb, cold and pale, with calf pain when you walk, raises the question of circulation rather than nerves.
- Numbness that comes and goes with sitting, crossing your legs or tight laces is usually pressure. How to stop it quickly.
How numbness is checked
A good assessment starts with the story: where, one side or both, how long, and how fast it spread. Then comes the examination:
- The 10-gram monofilament, which tests protective sensation, the level of feeling that warns you about injuries. How the monofilament test works.
- A 128-Hz tuning fork for vibration, pinprick or temperature for the small fibers, and the ankle reflexes.
- Strength in the ankle and toes, and a look at how you walk.
- The pulses in the feet, and an ankle-brachial index if they are weak.
Blood tests look for the causes in the table above. Nerve conduction studies and EMG are not needed for most people. The ADA reserves them for atypical pictures: numbness that came on quickly, affects one side more than the other, or involves weakness. Standard nerve tests can be normal in small fiber neuropathy, which sometimes needs a skin biopsy.
What to do today while you find the cause
Soles, heels and between the toes, in good light. Use a mirror or your phone camera if you can’t see them easily.
A numb foot can’t report a splinter, a stone or a seam that rubs. What to look for in a shoe.
No heating pads, hot water bottles or hot soaks. Test bath water with your elbow or a thermometer; 90 to 95°F is safe.
Look for vitamin B6, especially in “nerve support” blends. Take the bottles to your appointment.
Which parts, one side or both, when it started, and whether it is spreading. It shortens the path to a diagnosis.
Persistent numbness always deserves an examination and blood tests. If nobody has looked for the cause, it has not been looked for.
Common questions
Is numbness in the feet a sign of diabetes?
It can be. Diabetes is the leading cause of peripheral neuropathy in the United States, and numbness in both feet, starting in the toes, is a typical early sign. A blood glucose and HbA1c test answers the question. Numbness in one foot only is much less likely to be diabetic.
Can a pinched nerve in the back cause numb feet?
Yes. A nerve root compressed in the lower back can cause numbness down one leg into the foot, often with back or buttock pain. The top of the foot and big toe, or the outer foot and sole, are common areas. Numbness in both legs with bladder or bowel changes is an emergency. How to tell a back problem from neuropathy.
Can poor circulation cause numb feet?
It can. Peripheral arterial disease causes numbness or weakness in the legs, cold feet, and calf pain on walking that eases with rest. A foot that suddenly becomes cold, pale and numb is an emergency.
Which vitamin deficiency causes numb feet?
Vitamin B12 deficiency is the best known. It can cause numbness and tingling in the feet and hands before any anemia appears, and it is more likely if you take metformin or long-term acid-reducing medicine. Too much vitamin B6, usually from supplements, causes a similar numbness.
Will the numbness in my feet go away?
It depends on the cause. Pressure-related numbness passes in minutes. Numbness from a correctable cause, such as low B12, excess B6 or a squeezed nerve, often improves over months once the cause is dealt with. Long-standing diabetic numbness rarely returns to normal, but it can be stopped from getting worse. What recovery realistically looks like.
Related reading
Numb toes: reading the pattern · How to stop numbness in the legs and feet · Tingling in the feet · Neuropathy in the feet · Back nerve pain versus neuropathy · Tarsal tunnel syndrome
Sources and further reading: England JD et al., Practice parameter: evaluation of distal symmetric polyneuropathy, the role of laboratory and genetic testing, Neurology, 2009, on the highest-yield screening blood tests. American Diabetes Association Standards of Care in Diabetes—2026, section 12, on other causes to consider, the foot examination and when nerve studies are needed. NINDS, peripheral neuropathy. NIH Office of Dietary Supplements, vitamin B12 and vitamin B6. StatPearls, foot nerves, superficial peroneal nerve and anterior tarsal tunnel syndrome. NHS, peripheral arterial disease. NIDDK, diabetes and foot problems. Emergency signs: CDC, stroke; NINDS, Guillain–Barré syndrome; NHS, sciatica.
This page is general education and is not a diagnosis or a treatment plan. Clinical review by Dr. Biernacki is pending; the review date will be shown here once complete.
For our Michigan neighbors
Numb feet, and nobody
has found out why?
An examination and the right blood tests find a treatable cause more often than people expect. Dr. Biernacki’s Michigan practice can start there.
Everywhere else, take this page to your own clinician.
Dr. Tom Biernacki, DPM, FACFAS is a double board-certified foot and ankle surgeon (ABFAS and ABPM) and a Fellow of the American College of Foot & Ankle Surgeons. He is the founder of Balance Foot & Ankle in Howell and Bloomfield Township, Michigan, where peripheral neuropathy, diabetic foot risk and loss of protective sensation are part of his weekly clinic. His patient education videos have drawn more than 950,000 subscribers on YouTube. Managing Neuropathy is written by its editorial team under his direction, to put the explanation he gives in the exam room in front of the people who cannot get to one — including when a product is worth buying and when it is not.