Why Are My Feet Numb?
Numbness in the feet almost never announces itself. It arrives as something you notice by accident — a sock that feels bunched when it isn’t, a floor that seems further away than it used to be, the odd sensation of standing on a thin layer of carpet in a room with no carpet in it. By the time most people mention it to a doctor, it has been there for months.
What is usually happening is peripheral neuropathy: damage to the small nerves that carry sensation from your feet to your spinal cord. It is common, it has a long list of possible causes, and a good number of those causes are treatable — but only if someone goes looking. This is what the pattern tends to mean, what a proper investigation involves in Canada, and what genuinely helps once you have an answer.
Why it starts in the feet
The nerves running to your toes are the longest in your body — close to a metre of nerve fibre from the base of the spine to the tip of the big toe. When something damages nerves diffusely, whether that is high blood sugar, a vitamin deficiency or a drug, the longest fibres fail first, because they have the most surface area to maintain and the least margin for error.
That single fact explains the classic pattern. Symptoms start in both feet at once, usually symmetrically. They begin at the toes and creep slowly upward over months or years. When the numbness reaches roughly mid-calf, the fingertips often start too, because by then the hand nerves have become the next-longest in line. Clinicians call this a stocking-and-glove distribution, and it is the signature of a nerve problem affecting the whole body rather than one damaged nerve in one place.
The important corollary is that a symptom which doesn’t fit that pattern probably isn’t this. Numbness in one foot only, or in a wedge-shaped patch rather than a stocking, or arriving over days rather than years, points somewhere else — and often somewhere more urgent.
What it actually feels like
Neuropathy produces two categories of symptom at once, and people are often surprised that they can have both.
Loss of sensation is the quieter half: numbness, deadness, a feeling that the floor is padded, difficulty telling hot bathwater from warm, and an unsteadiness in the dark or on uneven ground that comes from your feet no longer reporting reliably where they are. This half is easy to dismiss because it doesn’t hurt.
Added sensation is the half people come in about: burning across the soles, pins and needles, brief electric shocks, deep aching, and a peculiar sensitivity in which the weight of a bedsheet becomes unpleasant. That last one — pain from something that should not be painful at all — is called allodynia, and it is one of the more reliable signs that a nerve rather than a joint or muscle is generating the problem.
Both halves typically get louder at night. That is partly because there is nothing else competing for your attention, and partly because the nerves themselves are more excitable when you are still.
The causes worth ruling out
Diabetes and prediabetes
Diabetes is the single most common cause in Canada, and up to half of people with diabetes will develop some degree of neuropathy over their lifetime. It can also be the presenting sign — numb feet occasionally arrive before anyone has said the word “diabetes” out loud.
Prediabetes and impaired glucose tolerance matter here too. Glucose levels well short of a diabetes diagnosis are associated with small-fibre nerve damage, which is why a fasting glucose in the normal range is not on its own enough to close the question. Diabetes Canada’s clinical practice guidelines recommend screening for neuropathy at diagnosis in type 2 diabetes and five years after diagnosis in type 1, then annually — with a 10 g monofilament or a 128 Hz tuning fork at the great toe. If nobody has touched your feet with either instrument at an annual review, that screening has not happened.
Vitamin B12
Low B12 is the most satisfying cause to find, because replacing it can stop the progression. It is also easy to miss, because the deficiency develops slowly and the blood test is not always ordered.
Several groups are at raised risk: people over about 60, whose stomachs absorb B12 less efficiently; people taking metformin long term; people on a proton pump inhibitor such as pantoprazole or omeprazole for years; people who have had stomach or bowel surgery; and people eating a vegan or near-vegan diet without supplementing. Metformin is worth singling out because it is one of the most prescribed drugs in the country and the effect is dose- and duration-dependent — the risk sits with someone who has been on a substantial dose for years, not someone who started last month.
The mirror image of this is worth knowing too: too much vitamin B6 causes neuropathy rather than treating it. Sustained intakes well above the daily requirement — the kind found in high-dose B-complex products taken for years — can produce exactly the sensory neuropathy people are often taking them to prevent. If you are taking a supplement for numb feet, bring the bottle to the appointment.
Alcohol
Regular heavy drinking damages peripheral nerves directly, and compounds the damage by depleting thiamine and other B vitamins. The pattern is the standard one — burning feet, worse at night — and it improves, slowly and partially, when the drinking stops. This is a difficult conversation and it gets skipped, which is unfortunate, because it is one of the few causes where the treatment is entirely within the patient’s hands.
Thyroid, kidney and other medical causes
An underactive thyroid, chronic kidney disease, coeliac disease, HIV, hepatitis C, Lyme disease, rheumatoid arthritis, lupus and Sjögren’s syndrome can all produce neuropathy. So can several blood disorders involving abnormal proteins, which is why a protein electrophoresis is part of a standard workup even though most people have never heard of it.
Medications
Chemotherapy is the best known — platinum drugs, taxanes and vinca alkaloids all cause neuropathy, sometimes lasting well beyond the end of treatment, and anyone finishing chemotherapy with new foot numbness should report it rather than waiting to see. Beyond oncology, the list includes metronidazole, isoniazid, amiodarone, phenytoin, some HIV medications and long-term nitrofurantoin. If numbness began within a few months of starting any new long-term drug, that timing is worth raising with your pharmacist, who can check the whole list faster than anyone.
When nothing turns up
After a thorough workup, somewhere between a fifth and a third of cases have no identified cause. This is called idiopathic neuropathy, and being handed that label is genuinely frustrating — but it is not the same as being dismissed. It typically means the slow, mild, sensory kind, and it usually stays that way for years. It also earns a repeat look at glucose tolerance and B12 down the road, because causes sometimes declare themselves later.
Things that feel like neuropathy and aren’t
Numb feet have several other explanations, and telling them apart mostly comes down to whether both feet are involved and what makes it worse.
| Cause | Typical pattern | What it does with activity |
|---|---|---|
| Peripheral neuropathy | Both feet, symmetrical, toes upward, gradual over months to years | Largely unaffected by walking; usually worse at night and at rest |
| Lumbar spinal stenosis | Buttock, thigh and calf as well as the foot; often one side worse; may skip areas | Comes on with walking and standing, eases within minutes of sitting or leaning forward |
| Peripheral artery disease | Calf cramping more than numbness; cold, pale foot; poor pulses | Brought on by walking a predictable distance, relieved by standing still |
| A single trapped nerve | One foot, one patch — the ball of the foot between the toes, or the sole below the inner ankle | Provoked by specific footwear or by standing; often sharply localised |
The stenosis distinction is the one most often muddled, because both conditions are common in the same age group and plenty of people have both at once. The tell is position: stenosis symptoms are bought and sold by posture and walking distance, while neuropathy carries on regardless. If the description in that row sounds more like your experience, what spinal stenosis actually is covers it properly.
Getting it investigated in Canada
This starts with a family doctor or nurse practitioner, and the first appointment is more useful than people expect. A competent bedside examination — testing light touch, vibration with a tuning fork, pinprick, temperature and ankle reflexes, and checking foot pulses — establishes both the pattern and how far it has progressed, without any technology at all.
The blood work that follows is fairly standard: HbA1c and fasting glucose, and an oral glucose tolerance test if those are borderline; vitamin B12; TSH for thyroid function; kidney function; a complete blood count; and serum protein electrophoresis. Ask what was ordered and what the numbers were, particularly the B12 — a result in the low-normal range with symptoms is a different conversation from a clearly normal one, and it is a conversation worth having rather than accepting “your bloods were fine”.
Referral to a neurologist follows if the picture is unusual, progressing quickly, involves weakness, or if the initial tests come back clean. Nerve conduction studies and EMG measure how well the larger nerve fibres are working; they are uncomfortable rather than painful, and they are normal in pure small-fibre neuropathy, which does not mean nothing is wrong. Waits for community neurology run from a few months to well over a year depending on the province and the urgency assigned, so it is worth asking to be told if a cancellation slot opens.
Some patterns need attention sooner rather than at the next available appointment. Numbness or weakness that worsens noticeably over days to a few weeks; any real weakness — tripping on curbs, catching a toe, difficulty lifting the front of the foot; symptoms in one leg only; numbness spreading upward from both feet toward the trunk, or reaching the hands early; any change in bladder or bowel control; and a cut, blister, ulcer or area of redness on a foot you cannot feel properly. The last one is not an emergency in the way the others are, but a foot wound in a numb foot is exactly how a small problem becomes a serious one, and it should be looked at within days.
What actually helps
Treating the cause, where there is one
This is the only part of the plan that changes the trajectory rather than the symptoms, and it is worth being honest about how well it works. In type 1 diabetes, tight glucose control substantially reduces the risk of developing neuropathy and slows it once present — the evidence there is strong. In type 2 diabetes the effect on neuropathy specifically is more modest and less certain than most people are told, though better control remains worth pursuing for every other reason.
B12 replacement, by injection or high-dose oral tablets, stops the progression of a deficiency neuropathy and may recover some function, particularly if it is caught within the first year or so. Stopping alcohol, adjusting a culprit medication with your prescriber, or treating a thyroid problem all work on the same principle: existing nerve damage recovers slowly and incompletely, so the value lies in preventing the next year’s worth.
Medication for the pain
Numbness itself has no drug treatment. Burning and shooting pain does, and the Canadian Pain Society consensus statement on neuropathic pain sets out the order: gabapentinoids (gabapentin, pregabalin), tricyclic antidepressants (amitriptyline, nortriptyline) and SNRIs (duloxetine, venlafaxine) are all first line, with tramadol and other opioids second line and cannabinoids third.
Set expectations before starting any of them. In the trials, roughly one person in six to eight gets a halving of their pain that they would not have got from placebo — meaning most people will need to try more than one drug, and some will not find a useful one. All of them are started low and increased slowly, all of them take weeks to show their effect, and all have real side effects: drowsiness and swollen ankles with the gabapentinoids, dry mouth and morning grogginess with the tricyclics, nausea with duloxetine. Older adults are more sensitive to all of it, and a gabapentinoid that improves the pain but doubles the fall risk is not a good trade.
Topical options — lidocaine patches, high-strength capsaicin — avoid the systemic side effects and suit small, well-defined areas. Coverage varies by province and several of these drugs sit behind special authority or exceptional access paperwork, so it is worth asking your pharmacist what your plan actually covers before the prescription is written rather than at the counter.
Foot care, which matters more than the pain does
This is the part that gets underplayed, and it is the part that protects your feet. A foot that cannot feel properly cannot warn you. Injuries in numb feet are found by looking, not by noticing, and a blister that would have been trivial on a foot with normal sensation can progress to an ulcer and an infection because nobody knew it was there.
- Look at your feet every day, including the soles and between the toes. A mirror on the floor or a phone camera solves the reach problem.
- Test bathwater with a hand or elbow, never a foot. Keep hot water bottles and heating pads away from feet entirely — burns are common and painless.
- Shake out shoes before putting them on, and don’t go barefoot, including indoors.
- Choose footwear with a deep toe box and no internal seams over the toes, and break new shoes in over short wears.
- Have any cut, blister, callus, ingrown nail, colour change or new redness looked at rather than treated at home.
Diabetes Canada’s foot care guidance is written for diabetes but applies to any insensate foot. On cost: routine foot care by a chiropodist or podiatrist is not covered by most provincial health plans, though many private benefit plans include it and some diabetes education centres and community health centres offer subsidised clinics. Ask — the assumption that it is unaffordable stops people asking.
Balance, and the fall you don’t have
When your feet stop reporting accurately, you lose one of the three systems that keep you upright, and vision has to work harder to cover for it. That is why the unsteadiness is worse in the dark and on uneven ground, and it is why fall risk rises with neuropathy independent of everything else.
The response is specific balance training rather than general fitness — standing work, weight transfer, controlled single-leg loading. Ankle and hip strengthening helps, as does the unglamorous business of lighting the route to the bathroom, clearing thresholds and rugs, and putting a rail where the stairs turn. Tai chi has the best falls-prevention evidence of any organised exercise and is widely and cheaply available in Canada, which makes it a reasonable place to start if you want the training to be something you actually keep doing.
What doesn’t hold up
Alpha-lipoic acid has more supporting evidence than most supplements sold for neuropathy, and it is still not much: modest symptom improvement in some trials, mostly short, mostly on the intravenous form used in Germany, with the largest long-term oral trial missing its primary endpoint. If you want to try it, it is reasonably safe and cheap — but treat four to six months of no clear change as your answer.
B12 supplements do nothing for neuropathy in someone who is not deficient, which is a large share of the people buying them. Neither do the “nerve support” blends built on B vitamins, several of which contain enough B6 to be a hazard rather than a help over years of use.
The clinics advertising neuropathy reversal packages deserve plain language: infrared and low-level laser devices, electrical stimulation courses, and proprietary protocols sold as multi-thousand-dollar prepaid packages are not supported by evidence that would justify the price. Nerve damage from years of high blood sugar does not reverse in twelve sessions. If a clinic asks for payment upfront for a fixed number of treatments and guarantees a result, that structure is the warning sign, whatever the equipment in the room looks like.
The goal is not to get the feeling back. It is to stop losing more of it, to make the burning liveable, and to keep the feet you can’t feel out of trouble.
Living with it
Most sensory neuropathy progresses slowly. The common experience is a condition that changes very little from one year to the next, is worse on some days than others, and gradually stops being the first thing you think about — not because it went away but because the practical parts, the daily look at the feet and the shoes that fit and the light in the hallway, become habit.
What tends to be harder than the numbness is the unsteadiness and the loss of confidence that comes with it: not walking the dog on frosty mornings, avoiding the stairs at a friend’s house, giving up the evening walk. That withdrawal costs more health than the neuropathy itself does, and it is worth naming as a target rather than accepting as a consequence. The Calgary Neuropathy Association runs webinars and support meetings that are open to people anywhere in the country, and Pain BC runs a pain support line, online support and wellness groups and a free nine-week pain education programme — worth checking which of them are open to you if you live outside British Columbia.
If your feet have been numb for a while and nobody has investigated why, that is the thing to fix first. There is a real chance the answer is a vitamin level or a blood sugar that can still be acted on — and if it turns out to be nothing that can be reversed, knowing that is still better than wondering, and it changes what you do about your feet from that day on.
