There’s a sentence people hear far too often when they report burning or tingling feet, particularly past a certain age.
It’s just one of those things. Nerve damage. Not much to be done.
Sometimes that’s accurate. Often it’s premature — because a meaningful proportion of foot neuropathy has an identifiable cause, and several of those causes are correctable. Nerves can recover when whatever is damaging them stops.
The catch is timing. Recovery is far more likely when the cause is found early, and far less likely after years of ongoing damage. Which makes “let’s just monitor it” an expensive strategy.
This article covers the causes worth actively chasing, how each is identified, and what correcting it realistically achieves.
An important framing note first: physical therapists don’t order or interpret bloodwork. What follows is intended to help you have a more productive conversation with your physician, not to substitute for one.
Vitamin B12 Deficiency
Why it’s first on the list: It’s one of the most common correctable causes and one of the most frequently overlooked.
The critical detail: Neuropathy can be the only manifestation of B12 deficiency, with no blood abnormalities at all. People assume a deficiency would show up as anemia. It often doesn’t — and the clinical picture over recent decades has trended toward neurological signs predominating.
Why it’s missed in people with diabetes: B12 deficiency neuropathy is clinically indistinguishable from diabetic neuropathy. Someone with diabetes who develops burning feet gets told it’s their diabetes, which is reasonable and sometimes wrong.
Who’s at higher risk: Anyone taking metformin long-term, anyone on long-term acid-reducing medication, people following vegetarian or vegan diets, older adults, and anyone with conditions affecting absorption.
What correction achieves: B12 deficiency neuropathy is often reversible when caught early. Longstanding damage may not fully resolve, which is the argument for checking sooner rather than later.
Worth asking: “Can we check my B12? And if it’s borderline, can we check methylmalonic acid?” That second test can identify deficiency at the cellular level when the B12 number itself looks acceptable.
Metformin, Specifically
Why it gets its own section: Metformin is one of the most widely prescribed medications in the world, and it lowers B12 levels. Reported prevalence of metformin-associated B12 deficiency varies widely across studies — figures ranging from roughly 6 percent to over 50 percent — with the variation reflecting different thresholds, populations, doses, and durations.
The trap: A person with type 2 diabetes on long-term metformin develops burning feet. It’s attributed to diabetic neuropathy. Nobody checks B12. The deficiency continues.
To be clear: This is not a reason to stop metformin. It’s an excellent medication and stopping it without medical advice would be a mistake. It’s a reason to have B12 monitored while taking it.
Prediabetes and Insulin Resistance
The overlooked window: Nerve damage doesn’t politely wait for a diabetes diagnosis. It can begin during the prediabetic phase, and guidance now supports screening for neuropathy in people with prediabetes — with a substantial proportion potentially having detectable nerve damage before symptoms appear.
Why it’s missed: A neuropathy workup checks for diabetes, doesn’t find it, and the case gets labeled idiopathic.
What correction achieves: This is one of the more encouraging areas. Neuropathy associated with prediabetes can sometimes improve with weight loss and lifestyle change, whereas long-standing diabetic neuropathy typically doesn’t fully reverse — though progression can be slowed and symptoms managed.
Worth asking: “What’s my HbA1c, and where does it sit relative to the prediabetes range?”
Thyroid Dysfunction
What to know: Hypothyroidism is an established cause of peripheral neuropathy, and it’s straightforward to test for and treat.
A clinical clue: Delayed reflexes are characteristic of hypothyroid presentations — one of several patterns clinicians use to point toward a specific cause.
Worth asking: “Has my thyroid function been checked recently?”
Alcohol
What to know: Regular alcohol use above certain levels is a well-recognized cause of peripheral neuropathy, through both direct effects on nerve tissue and associated nutritional deficiencies — particularly thiamine.
What correction achieves: Reducing or stopping intake, alongside addressing nutritional deficiencies, can halt progression and produce improvement, particularly earlier on.
A note on honesty: This is a topic people underreport to clinicians, understandably. But it’s genuinely one of the more actionable causes, and a physician asking isn’t making a judgment — they’re looking for something they can do something about.
Medications Other Than Metformin
What to know: A number of medications can cause or contribute to peripheral neuropathy. Chemotherapy agents are the best known. Certain antibiotics, some cardiovascular drugs, some medications used for autoimmune conditions, and others appear in this category.
Worth asking: “Could any of my current medications be contributing to this?” — bringing a complete list including supplements.
Important: Never stop a prescribed medication on your own based on an article. The question belongs with your prescriber, who can weigh it against why you’re taking it.
Compression — Mechanical, Not Systemic
What to know: Not all foot symptoms are systemic. A nerve compressed at a specific point — behind the inner ankle, below the outside of the knee, or at a nerve root in the lower back — produces symptoms that can look like neuropathy but have an entirely mechanical cause.
The distinguishing features: Usually one-sided. Often a defined patch rather than a symmetrical stocking pattern. Frequently changes with position, footwear, or activity.
What correction achieves: Compression neuropathies are among the more reversible presentations when the compression is identified and relieved promptly. This is squarely physical therapy territory, and it’s the category most likely to be missed when everything gets attributed to age or diabetes.
Other Causes Worth Investigating
Kidney disease. Certain autoimmune and inflammatory conditions. Some infections. Inherited neuropathies, particularly where there’s family history or onset earlier in life. Toxin exposure in some occupational settings. Rarely, some blood disorders.
These are less common, which is precisely why a physician-led workup matters rather than self-directed investigation.
When “Idiopathic” Is the Answer
Sometimes no cause is found even after appropriate testing, and that’s a legitimate outcome rather than a failure.
Two things are still worth knowing. First, an idiopathic label after a thorough workup is meaningfully different from one applied without testing — it’s worth establishing which you have. Second, an unidentified cause doesn’t mean nothing can be done. Balance, strength, gait, foot protection, and pain management remain available and effective regardless of cause.
One Thing to Be Aware Of
Standard nerve conduction studies measure large nerve fibers. Small fiber neuropathy — which typically produces burning pain and altered temperature sensation — may not show up on those tests.
This means a normal nerve conduction study doesn’t necessarily mean nothing is wrong. If you have burning feet and were told your tests were normal, that’s worth raising rather than accepting as a closed question.
What to Take to Your Appointment
Your symptom pattern: one foot or both, symmetrical or not, where it started, how it’s spread, what it feels like, what changes it.
A complete medication list, including over-the-counter drugs and supplements.
An honest account of alcohol intake.
Family history of neuropathy or neurological conditions.
Specific questions: B12 and methylmalonic acid, HbA1c, thyroid function, kidney function, and whether any of your medications could contribute.
Seek Prompt Care For
Rapidly progressing or spreading symptoms. Weakness, particularly if worsening. Symptoms that began suddenly. Any new wound, blister, or ulcer on a foot with reduced sensation. Signs of infection. Symptoms alongside unexplained weight loss, fever, or feeling unwell.
The Point
“Nerve damage, nothing to be done” is sometimes true and frequently premature.
Before accepting it, it’s worth knowing whether the correctable causes were actually checked — because the value of finding one drops considerably with every year that passes.
Let’s Work Out What You’re Dealing With
An assessment can establish whether your presentation looks mechanical, systemic, or mixed — which determines whether the next step is treatment here or a conversation with your physician.
Kriz Physical Therapy offers a free discovery visit at no cost and no obligation. You’ll get a thorough neurological and movement assessment, a clear explanation of what your pattern suggests, and specific guidance on what’s worth raising medically.
We work alongside your physician, not instead of them.
