Symptoms & causes
Reading your symptoms, and finding the cause
Almost everything useful about neuropathy comes from the pattern rather than the sensation. Where it started, whether both sides match, and how fast it moved will tell a clinician more than any description of how it feels.
The four questions that do most of the work. Where did it start? Did both sides begin together? How quickly has it moved? And what does it actually feel like — burning, numb, electric, or like walking on cotton? Bring those four answers to an appointment and you have done most of the useful thinking already.
What peripheral neuropathy means
Damage to the nerves outside the brain and spinal cord. It is a description of what has happened rather than a disease in itself, in the same way that “fracture” describes a broken bone without saying how it broke.
It reaches the feet first because the nerves running to your toes are the longest in the body and the hardest to maintain at their far end. That single fact explains the classic progression — toes, then the ball of the foot, then upward, on both sides at once — and it is why a problem in one foot only, or one that started higher up, usually points somewhere else entirely. The full explanation is here.
Reading your own pattern
Toes first, spreading slowly upward, is the length-dependent pattern that points at a systemic cause. Starting in one patch, or higher up the leg, does not.
Symmetric suggests something acting on the whole nervous system — glucose, a deficiency, a toxin. One-sided suggests a nerve compressed at a single point, or a nerve root in the back.
Years is typical. Weeks is not, and rapid progression deserves prompt assessment rather than a wait-and-see.
Burning, stabbing and temperature confusion are small-fiber symptoms. Numbness, unsteadiness and a walking-on-cotton feeling are large-fiber. Most people have a mixture, and the mixture shifts over time.
Symptom guides
Numb toes
Where the numbness sits, whether both sides match, and how fast it arrived narrow the cause more than the sensation does.
Burning feet at night
Why the evening is reliably worse, and why the two things people try first — a heating pad and an ice bath — are the two most likely to injure a numb foot.
Cold feet
Cold to the touch, or only cold to you? That one check separates circulation from nerves. What helps, what burns numb feet, and the one cold foot that can’t wait.
Restless legs and night cramps
An urge to move that eases when you walk, a calf that locks into a knot, or nerve pain that does neither. How to tell the three apart, and the iron test worth asking for.
Tingling in feet
Pins and needles that will not settle, what separates a positional tingle from a persistent one, and when it needs testing.
Peripheral neuropathy symptoms
The full symptom picture across small, large and autonomic fibers, and which combination points where.
Foot drop
When the front of the foot stops lifting. Some causes recover if they are found early, which is why this one is urgent.
Autonomic symptoms
Dizziness on standing, feet that no longer sweat, digestive change — nerve symptoms that do not look like nerve symptoms.
Numb feet
Usually a nerve problem, sometimes a back or circulation one: how the pattern points to the cause, and the red flags.
Numbness by location
Where the numbness sits says a lot. One foot or one patch usually means a single squeezed nerve; both soles usually mean neuropathy. Which nerve, what to try first, and the signs that can’t wait.
Pins and needles in the feet
The moves that stop it within a minute, why it happens, and what it means when it keeps coming back.
Nerve pain in the foot
Burning, electric or shooting pain, mapped by where it hurts, and the nerve usually involved.
Neuropathic pain
Why nerve pain burns, shoots or stabs, how it is diagnosed, and the treatments guidelines recommend first.
Numbness in hands and feet
When both go numb or tingle the cause is usually body-wide. The deficiencies and blood tests that find it.
The monofilament test
What the 10-gram foot exam checks, what a missed spot means, and a 30-second check at home.
Nerve conduction study and EMG
What the tests measure, how they feel, and why a normal result can miss small fiber neuropathy.
Causes and conditions
The list of causes is long; the practical version is short. Find out whether yours is one of the correctable ones — because that is where real improvement comes from, and because a search that stopped at “probably age” is an unfinished search.
Neuropathy in the feet
The foundation page: what the damage is, why it starts in the toes, the causes worth ruling out, and whether it can be reversed.
Diabetic neuropathy
The four patterns diabetes produces, only one of which is the numb feet everyone pictures.
Small fiber neuropathy
Why the nerve test comes back normal while your feet burn, and how it is actually diagnosed.
Types of neuropathy
Mononeuropathy, polyneuropathy, autonomic and more — the vocabulary clinicians use and what each implies.
Alcohol-related neuropathy
Directly toxic to nerves and it blocks the B vitamins nerves need — damage by two routes at once.
Radiculopathy vs neuropathy
A pinched nerve root in the back and a length-dependent polyneuropathy feel similar and are managed completely differently.
Tarsal tunnel syndrome
The tibial nerve squeezed behind the inner ankle burns the sole of one foot — a findable, sometimes fixable cause.
Baxter’s neuropathy
A trapped nerve in the heel that is routinely mistaken for plantar fasciitis that will not heal.
Charcot-Marie-Tooth disease
An inherited neuropathy: the early signs, how it runs in families, and why it causes high arches and foot drop.
Vitamin B12 deficiency
How low B12 damages nerves, who is at risk, metformin users included, and the tests and doses that matter.
Vitamin B6 toxicity
How much B6 is too much, the nerve symptoms it causes, and how recovery goes.
Chemo-induced neuropathy
Which chemotherapy drugs cause it, how long it lasts, and what the ASCO guideline does and does not support.
Peroneal neuropathy
The nerve that wraps around the knee, where leg crossing, weight loss or a tight brace can pinch it.
Nerve damage after foot surgery
Numbness near a new scar is common. The signs that point to nerve damage, and how long nerves take to heal.
Meralgia paresthetica
Burning or numbness on the outer thigh: the skin nerve pinched at the front of the hip, how long it lasts, and what helps.
Femoral nerve pain
Pain or numbness in the front of the thigh and a knee that gives way: the causes, diabetic amyotrophy, and how recovery goes.
Mononeuritis multiplex
Numbness or weakness in two or more separate nerves, often on different sides: vasculitis and the other causes, the tests, and treatment.
Axonal neuropathy
“Axonal” on a nerve test report: what it means, the common causes, the blood tests that find them, and recovery.
Idiopathic neuropathy
Told no cause was found? What the label means, the tests that are easy to miss, the outlook, and when to get a second look.
Diabetic amyotrophy
Sudden hip or thigh pain, then thigh weakness, in diabetes: the look-alikes, what helps, and how slowly recovery goes.
Why the cause matters more than the label
Several common causes are correctable, and correcting them early is the only route to genuine recovery: vitamin B12 deficiency, thyroid disease, alcohol, and an excess of vitamin B6 — which appears at high doses in many “nerve support” supplements and causes the very problem they are bought for. Diabetes and prediabetes are the largest single group, and glucose control is the intervention with the strongest evidence for slowing progression.
The tests worth asking for by name are glucose and A1c, vitamin B12, thyroid function, kidney function and a blood count. Questions worth asking at the appointment are here.
Describing it usefully
| They want to know | Say something like |
|---|---|
| Where it started and where it is now | “Both big toes about two years ago, now up to the ball of both feet.” |
| Whether the two sides match | “Both feet, about the same.” Or: “The left is much worse.” |
| How fast it has moved | “Slowly over years” and “noticeably worse in the last six weeks” point at different things entirely. |
| What it feels like | Burning, electric, pins and needles, numb, or like walking on cotton. |
| What changes it | Worse at night, better when walking, worse after standing all day. Nerve pain is characteristically worse at rest. |
Get seen promptly for numbness that is spreading noticeably, new weakness — especially difficulty lifting the front of the foot — a new difference between the two sides, any open sore or blister, or a foot that has become warm, swollen and changed shape without an injury. A rough week is not the same as a change in pattern.
Common questions
Is neuropathy always diabetes?
No. Diabetes is the most common single cause, but a meaningful share of cases come from something else and several of those are correctable. If nobody has checked your B12, thyroid and glucose tolerance, the search is not finished.
My nerve test was normal but my feet burn. What now?
Standard nerve conduction studies measure large fibers. Burning is a small-fiber symptom and small-fiber neuropathy is routinely present with a completely normal study. It needs a different test.
Why is it always worse at night?
Less competing sensation, less distraction, and you are lying still. It is one of the most consistent features of nerve pain and it does not mean the condition is deteriorating.
Does numbness without pain still matter?
More, not less. Painless numbness carries the same risk of unnoticed injury while removing the symptom that would otherwise send you to a clinician. That is what the daily foot check is for.
For our Michigan neighbors
Has the pattern
actually been examined?
Protective sensation, pinprick, vibration and circulation can all be tested in one visit. Dr. Biernacki’s practice in Howell and Bloomfield Township does this every week.
Everywhere else, take this page to your own clinician.