The foundation
Neuropathy in the feet
It starts in the toes because the longest nerves in the body fail at their far end first. Understanding that one fact explains most of what follows — the pattern, the risk, and where treatment can and cannot help.
Written by the Managing Neuropathy editorial team under the direction of Dr. Tom Biernacki, DPM, FACFAS · Clinical review pending · Last updated 6 September 2026
The short answer. Peripheral neuropathy is damage to the nerves outside the brain and spinal cord. It reaches the feet first because those nerves are the longest. Diabetes is the most common cause, but a meaningful share of cases come from something else that is correctable — and finding which one you have is the part that changes your outcome. The damage itself is often permanent; the progression usually is not, and the complications almost always are preventable.
What peripheral neuropathy actually is
Your nervous system has a center — the brain and spinal cord — and a periphery: every nerve that runs out from it to the skin, the muscles and the organs. Damage to those outer nerves is peripheral neuropathy. It is not one disease. It is a description of what has happened, in the same way that “fracture” describes a broken bone without saying how it broke.
The nerves reaching your toes are the longest in your body. A nerve fiber has to be maintained along its entire length, and the far end of a very long fiber is the hardest part to maintain. So when something puts the whole nervous system under strain — high glucose, a vitamin deficiency, a toxin — the failure shows up at the point furthest from the body first. That is why almost everyone describes the same progression: toes, then the ball of the foot, then upward. Clinicians call it a stocking pattern, and when it eventually reaches the hands as well, a stocking-and-glove pattern.
This matters practically. A symmetric problem that started in both sets of toes and crept upward behaves like a systemic cause. A problem in one foot only, or one that started higher up, usually does not — and it points somewhere else entirely, often to a nerve compressed at a single point or to a spinal nerve root. The pattern is the first thing worth reading.
Why it starts in the toes
Spinal cord. Both nerves start here with the same support.
Nerve to the fingertips — shorter, and still inside what the cell can maintain.
Nerve to the toes — longer, so its far end is the first to be left unsupported.
The dashed line is how far the nerve cell can maintain its fiber. It moves inward as the condition progresses.
Two kinds of nerve fiber, two kinds of symptom
Peripheral nerves carry different fiber types, and which ones are affected decides what you feel.
| Fiber type | What it carries | What its loss feels like |
|---|---|---|
| Small fibers | Pain and temperature | Burning, stabbing, electric or pins-and-needles sensations. Often worse at night. The foot can hurt intensely and still look and test normal. |
| Large fibers | Vibration, position sense, light touch | Numbness, a walking-on-cotton feeling, unsteadiness in the dark, and loss of the protective sensation that warns you about injury. |
| Autonomic fibers | Sweating, blood-vessel tone, gut and heart-rate control | Dry cracked skin on the feet, feet that no longer sweat, dizziness on standing, digestive changes. |
Most people have a mixture, and the mixture shifts over time. A common and confusing sequence is that the burning eases after some years while the numbness deepens. That is usually not recovery. It is the small fibers that generated the pain being lost.
What causes it
The list is long, but the practical version is short: find out whether yours is one of the correctable ones.
Diabetes and prediabetes
The most common cause by a wide margin. Sustained high glucose damages the small blood vessels that feed nerves. Importantly, this begins before a diabetes diagnosis — impaired glucose tolerance alone is associated with neuropathy, which is why a normal fasting glucose does not close the question and an A1c or a glucose tolerance test is worth asking about.
Alcohol
Directly toxic to peripheral nerves, and it also interferes with absorption of the B vitamins nerves depend on, so it damages them by two routes at once.
Vitamin B12 deficiency — and vitamin B6 excess
B12 deficiency is a classic, correctable cause. It is more likely if you take metformin, take long-term acid-reducing medication, have had gastric surgery, or eat little animal protein.
The mirror image catches people out: too much vitamin B6 causes neuropathy. It appears at high doses in many supplements marketed for nerve health, so a product bought to treat the problem can be sustaining it. We go through the supplement evidence here.
Medications
Several chemotherapy agents are well-recognized causes, and a number of other drugs can contribute. This is a conversation with the prescriber — never a reason to stop a medicine on your own.
Thyroid and kidney disease
Both are common, both are treatable, and both are found with ordinary blood tests.
Autoimmune and inflammatory causes
Some neuropathies are driven by the immune system attacking nerve tissue. These matter out of proportion to how common they are, because several respond to treatment — and because they tend to behave differently: faster onset, weakness rather than just numbness, or an asymmetric pattern.
Infections, inherited conditions, and no identified cause
Shingles, Lyme disease and HIV can all injure nerves. Inherited neuropathies such as Charcot-Marie-Tooth run in families and usually declare themselves earlier in life. And in a substantial minority of people, a thorough evaluation finds nothing — this is called idiopathic neuropathy. That is a legitimate answer, but it should be the conclusion of a search, not a substitute for one.
How it is evaluated
A good evaluation is mostly history and examination, with tests confirming rather than replacing it.
Where it started, whether both sides began together, how fast it has moved, and what medications, supplements and alcohol are in the picture.
A 10-gram monofilament for protective sensation, a tuning fork for vibration, pinprick and temperature for small-fiber function, ankle reflexes, and pulses. Simple, quick, and more informative than most people expect.
Glucose and A1c, vitamin B12, thyroid function, kidney function, and a blood count — with further tests added if the pattern is unusual.
Nerve conduction studies and EMG measure large fibers well and small fibers barely at all — which is why they can come back normal in someone with genuine burning pain. A skin biopsy can measure small fibers directly when the answer would change the plan.
Can neuropathy be reversed?
This deserves a straight answer, because the internet is full of two wrong ones.
Where there is a correctable cause and it is corrected early, real recovery is possible. B12 deficiency, thyroid disease and alcohol are the clearest examples. Nerves can regenerate, slowly, from the point of injury outward — millimetres per day at best, which over the length of a leg means months.
Where fibers have already been lost, they generally do not come back. Long-standing diabetic neuropathy is the common example. What can change is the rate of further loss, and that change is worth a great deal: glucose control has the strongest evidence of anything for slowing progression.
Symptoms and damage are not the same thing. Pain can improve substantially with treatment while the underlying fiber loss is unchanged, and numbness can deepen while pain fades. Feeling better is genuinely worth having. It is not proof that nerves have healed — and any product sold on that equivalence is selling you a coincidence. We take that apart here.
Does it come and go?
Symptoms do. Damage does not. Almost everyone has better weeks and worse weeks, and evenings are reliably worse than mornings — there is less to distract you and you are lying still, attending to it. Heat, poor sleep, stress, a long day standing and the weather all move the dial without moving the disease.
What signals genuine change is a shift in pattern rather than in intensity: numbness spreading noticeably further up, new weakness, or a new difference between the two sides. That is worth an appointment. A rough fortnight is not. The full separation of the two is here.
How serious is it?
Peripheral neuropathy is very rarely a direct cause of death. It is, however, the reason a chain of preventable events can start — and that chain is the honest answer to the question people are really asking.
A foot that cannot feel does not report a blister, a stone in the shoe, a seam, or a burn. An unnoticed injury becomes a wound, a wound in a foot with reduced circulation heals badly, and a poorly healing wound can become an infection that threatens the limb. The great majority of non-traumatic lower-limb amputations are preceded by a foot ulcer. Nearly every step of that sequence is interruptible, and almost all of the interrupting happens at home, daily, with your eyes rather than your feet.
Two other risks deserve naming. Loss of position sense causes falls, which cause fractures. And autonomic neuropathy — the fibers controlling heart rate, blood pressure and digestion — is associated with more serious outcomes, which is why symptoms like fainting on standing or unexplained digestive change should be mentioned rather than tolerated.
Get seen promptly for: any open sore, blister, crack or callus with bruising underneath; redness, warmth, swelling or drainage; any foot wound at all if you have diabetes; a foot that has suddenly become warm, swollen and changed shape without an obvious injury; rapidly progressing numbness or weakness; or new difficulty lifting the front of the foot.
What actually helps
Treatment splits into three goals that are easy to confuse, and worth separating before you spend money on any of them.
| Goal | What it looks like |
|---|---|
| Slow the damage | Treat the cause. Glucose control, correcting a deficiency, reducing alcohol, stopping smoking, treating thyroid or kidney disease. This is the only category that changes the trajectory. |
| Reduce the symptoms | Prescription medicines that act on nerve pain, physical therapy for balance and strength, sleep and pain management. Symptom relief is legitimate and worth pursuing on its own terms. |
| Protect the foot | Daily inspection, appropriate footwear, never applying heat, and prompt attention to any break in the skin. This is the category that prevents the outcomes people fear, and it is the cheapest of the three. |
Most of what is marketed to people with neuropathy sits in the second column while being sold as if it were the first. That is the single most useful filter to apply to any advertisement you see.
Common questions
Is neuropathy in the feet always diabetes?
No. Diabetes is the most common single cause, but a meaningful share of cases are caused by something else, and several of those are correctable. If nobody has checked your B12, thyroid and glucose tolerance, the search is not finished.
Why is it worse at night?
Partly because there is less competing sensory input and less distraction, partly because you are still. It is one of the most consistent features of nerve pain and it does not mean the condition is deteriorating.
My nerve test was normal but my feet burn. Is it in my head?
No. Standard nerve conduction studies measure large fibers. Small-fiber neuropathy — the type that produces burning — can be present with entirely normal nerve conduction studies. It needs a different test.
How long does it last?
If the cause is correctable and caught early, symptoms may improve over months. If fibers have been lost over years, treat it as a long-term condition to be managed and slowed rather than one to be finished with.
Which doctor should I see?
Start with the clinician who knows your overall health, since the cause is usually systemic. A podiatrist is the right person for protective sensation testing, footwear, wound risk and anything involving the skin and structure of the foot; a neurologist for nerve testing and unusual patterns.
Related reading
Numb toes: reading the pattern · What makes neuropathy worse · Home remedies, honestly assessed · Supplements and the B6 problem · The daily foot check · Choosing shoes
Sources and further reading: National Institute of Neurological Disorders and Stroke (NINDS), peripheral neuropathy overview. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), diabetic neuropathy and foot-care guidance. American Diabetes Association Standards of Care, neuropathy and foot-care sections, including glycaemic control to slow progression and B12 monitoring with metformin. National Institutes of Health Office of Dietary Supplements, vitamin B6 tolerable upper intake level.
This page is general education and is not a diagnosis, a treatment plan, or advice to start or stop any medicine. Clinical review by Dr. Biernacki is pending; the review date will be shown here once complete.
For our Michigan neighbors
Has anyone
tested the sensation?
Protective sensation can be measured in minutes, and knowing where you stand changes what you should be doing at home. Dr. Biernacki’s Michigan practice does this every week.
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. He writes Managing Neuropathy 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.