Symptoms and causes
Radiculopathy versus neuropathy
Both produce numbness, tingling and burning in the leg and foot. They come from different places, they are found by different tests, and they are treated by different people — so the distinction is worth getting right early.
Written by the Managing Neuropathy editorial team under the direction of Dr. Tom Biernacki, DPM, FACFAS · Clinical review pending · Last updated 7 September 2026
The short answer. Radiculopathy is a nerve root pinched where it leaves the spine. Peripheral neuropathy is damage to the nerves themselves, out in the limb. The quickest discriminators: radiculopathy is usually one leg, in a stripe, often with back or buttock pain, and worse with coughing, bending or certain positions. Polyneuropathy is usually both feet, in a stocking shape, worst at the toes, unaffected by position, and worse at night. They can also coexist, which is the case that confuses everyone.
Where each problem sits
A signal from the foot travels a long way: sensory ending in the skin, peripheral nerve up the leg, sciatic or femoral nerve through the thigh, then the nerve root through a narrow bony gap beside the spine before reaching the cord. Anything anywhere on that route produces symptoms in the foot. The clinical work is deciding where.
Radiculopathy is trouble at the root — most often a disc bulge, bony narrowing from arthritis, or spinal canal stenosis. Peripheral neuropathy is trouble in the nerve itself, from metabolic, toxic, nutritional or inflammatory causes. The full classification is here.
The discriminators
| Feature | Radiculopathy | Peripheral polyneuropathy |
|---|---|---|
| Sides | Usually one leg | Usually both, roughly symmetric |
| Shape of the symptoms | A stripe or band running down the leg into part of the foot | A stocking, worst at the toes, edge creeping upward |
| Back or buttock pain | Common | Usually absent |
| Effect of position | Changes with bending, sitting, standing, walking; worse on coughing or sneezing | Largely unaffected by position |
| Time of day | Worse with activity and certain postures | Classically worse at night and at rest |
| Onset | Often over days to weeks, sometimes with a clear moment | Slow, over months to years |
| Weakness | In the muscle group of one root, e.g. lifting the foot or standing on tiptoe on one side | Symmetric and late; small foot muscles first |
| Reflexes | One reflex reduced on one side | Ankle reflexes reduced or absent on both sides |
Two bedside tests that do a lot of work
Straight leg raise. Lying flat, the leg is lifted with the knee straight. Reproducing the leg symptoms at a modest angle points to root irritation. It has nothing to say about a polyneuropathy.
Foot inversion versus eversion. If the front of the foot is weak, testing whether turning the sole inward is also weak helps separate an L5 root problem from a peroneal nerve compressed at the knee. The full localisation of foot drop is here.
Add the shape of the sensory loss and the pattern of reflexes and most cases sort themselves out before any imaging is ordered.
The tests, and what each actually answers
- Nerve conduction studies and EMG can distinguish root-level from nerve-level involvement and can show whether damage is axonal or demyelinating. Their blind spot is small fibers — a small-fiber neuropathy can produce severe burning with a completely normal study. Why that happens.
- MRI of the lumbar spine shows discs and stenosis. Its weakness is the opposite one: age-related changes are extremely common in people with no symptoms at all, so an abnormal scan does not by itself prove the scan explains your foot.
- Blood tests — glucose and HbA1c, B12, thyroid, kidney function, and a paraprotein screen — are what identify a treatable polyneuropathy, and they get skipped surprisingly often once a scan has found something.
The case that confuses everyone: both at once
These conditions share a population. Older adults commonly have degenerative spinal change, and people with diabetes commonly have polyneuropathy — so having both is unremarkable rather than exotic. There is also a recognized idea that a nerve already compromised at one point tolerates a second insult poorly, which is one reason people with diabetes are more prone to compressive nerve problems.
Practically, suspect both when there is a symmetric stocking pattern in both feet plus a stripe of worse symptoms down one leg, or when one-sided weakness sits on top of long-standing bilateral numbness. The reason it matters is that only one of the two may be fixable — and treating the fixable part is worth doing even if the other remains.
Why the answer changes what happens next
Get seen urgently for these
Numbness around the groin, the buttocks or the inner thighs, or any change in bladder or bowel control, or new sexual dysfunction with back pain — that combination needs emergency assessment the same day. Also urgent: leg weakness that is worsening quickly, severe back pain with fever or unexplained weight loss, and back pain after significant trauma.
Common questions
Is sciatica the same as radiculopathy?
Near enough for everyday purposes. Sciatica describes pain running down the back of the leg along the sciatic nerve territory, usually caused by irritation of a lower lumbar root — so it is a common form of lumbar radiculopathy rather than a separate condition.
Can a back problem cause numbness in both feet?
It can, but the mechanism differs. Central spinal canal stenosis can affect both legs, characteristically with symptoms that come on after walking a certain distance and ease with sitting or leaning forward on a trolley. That activity-related pattern is quite unlike a polyneuropathy, which does not care whether you are walking.
My MRI shows a bulging disc. Does that explain my burning feet?
Only if the pattern matches. Bulging discs are extremely common in people without symptoms. Bilateral, symmetric, toes-first burning that is worse at night does not fit a single root, and a scan finding should not close the door on the blood tests.
Which specialist should I see?
Follow the pattern. One-sided with back pain points to spine — physiotherapy first, then a spinal specialist. Both feet, toes-first suggests starting with your primary care clinician for the workup, then a neurologist and a podiatrist for the foot. Who does what.
Can treating the back improve the numbness?
If the root was the cause, yes — often over weeks to months. If the numbness came from a polyneuropathy, spinal treatment will not change it, which is exactly why the distinction is worth making before anyone commits to a procedure.
Related reading
The full symptom list · Types of neuropathy · Foot drop and where it comes from · Numb toes and the pattern · Which doctor to see · Neuropathy in the feet
Sources and further reading: American Academy of Neurology guidance on electrodiagnostic assessment and on evaluating distal symmetric polyneuropathy. Published reviews of lumbosacral radiculopathy diagnosis and of the prevalence of incidental degenerative findings on lumbar MRI in asymptomatic adults. North American Spine Society clinical guidance on lumbar disc herniation with radiculopathy and on degenerative lumbar spinal stenosis.
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
The pattern in the foot
is where this gets settled.
Sensory mapping, reflexes, strength testing and circulation — the examination that says whether this is a back problem, a nerve problem, or both. Dr. Biernacki’s Michigan practice does it.
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.