Burning in the feet is most commonly caused by nerve damage, a condition called peripheral neuropathy. Diabetes is the single most frequent culprit, but the list of possible causes is long, ranging from vitamin deficiencies and alcohol use to infections, kidney disease, and even shoes that compress a nerve. The burning sensation happens when small nerve fibers that detect pain and temperature malfunction, firing pain signals when there’s no actual heat or injury.
Diabetes and High Blood Sugar
Diabetic neuropathy is the leading cause of burning feet worldwide. Persistently elevated blood sugar sets off a chain of destructive processes inside nerve cells: it disrupts how mitochondria produce energy, triggers inflammation, and generates oxidative stress that damages both the nerve fibers themselves and the tiny blood vessels that supply them. Over time, both the insulating coating around nerves (myelin) and the inner nerve fibers (axons) deteriorate. Abnormal insulin signaling compounds the problem by blocking the body’s ability to repair damaged nerve fibers and accelerating cell death.
The burning typically starts in the toes and soles and gradually creeps upward in a “stocking” pattern. It often feels worse at night. People with prediabetes can also develop this type of nerve damage, sometimes before they even know their blood sugar is elevated. Keeping blood sugar well controlled is the most effective way to slow or prevent further nerve deterioration.
Vitamin B12 Deficiency
B12 plays a critical role in maintaining the protective myelin sheath around nerve fibers. When levels drop too low, that sheath breaks down, and the exposed nerves begin misfiring, producing burning, tingling, or numbness that often starts in the feet.
What counts as “too low” may be higher than most people assume. The standard clinical cutoff for B12 deficiency is about 148 pmol/L, but research published in Neurology found that nerve conduction speed and sensory detection were significantly better in older adults whose B12 levels reached roughly 390 to 410 pmol/L. That’s nearly three times the traditional deficiency threshold. In other words, your B12 could technically be “normal” on a lab report while still being low enough to affect your nerves. Vegetarians, vegans, older adults, and people taking long-term acid-reducing medications are at the highest risk for deficiency.
Alcohol Use
Chronic alcohol use is one of the most common non-diabetic causes of burning feet. A literature review found that peripheral neuropathy is present in roughly 25 to 66 percent of people classified as chronic alcohol users, with an overall estimated prevalence of about 46 percent.
Alcohol damages nerves through at least two routes. First, acetaldehyde, a byproduct of alcohol metabolism, is directly toxic to nerve fibers. Ethanol itself disrupts the internal transport system that moves nutrients and signals along nerve axons and degrades the structural skeleton of the nerve cell. Second, heavy drinking frequently leads to poor nutrition, especially B-vitamin deficiencies, which compounds the damage. The result is a progressive breakdown of the longest nerve fibers first, which is why symptoms start in the feet before appearing anywhere else.
Small Fiber Neuropathy
Sometimes standard nerve tests come back normal, yet the burning persists. This is a hallmark of small fiber neuropathy, where only the thinnest nerve fibers in the skin are affected. These fibers are too small to show up on conventional nerve conduction studies, which measure the speed of electrical signals through larger nerves. A normal conduction study doesn’t rule out nerve damage.
Diagnosis requires a skin biopsy, typically a small punch taken from the lower leg about 10 centimeters above the ankle. The sample is stained with a marker that makes the tiny nerve endings visible under a microscope, and the number of nerve fibers per unit of skin is counted. A reduced count confirms the diagnosis. Small fiber neuropathy can be triggered by diabetes, autoimmune conditions, or, in a frustrating number of cases, no identifiable cause at all.
Kidney Disease
When the kidneys lose the ability to filter waste, toxic compounds build up in the blood and poison peripheral nerves. This is called uremic neuropathy. The toxins responsible are thought to be “middle molecules,” compounds too large to be efficiently removed by standard dialysis, along with advanced glycosylated end products and excess parathyroid hormone. These substances interfere with the energy-producing enzymes inside nerve fibers and disrupt the sodium-potassium pumps that keep nerve membranes functioning normally. Chronic high potassium levels, common in kidney failure, may also contribute.
The burning and tingling follow the same stocking pattern seen in diabetic neuropathy, starting in the feet and working upward. Symptoms often improve after a kidney transplant restores normal waste filtration, which supports the idea that circulating toxins are the primary driver.
Nerve Compression in the Ankle
Not all foot burning comes from a systemic condition. Tarsal tunnel syndrome occurs when the tibial nerve gets compressed as it passes through a narrow bony passage on the inner side of the ankle. The result is burning, tingling, or shooting pain in the sole of the foot. It’s essentially the foot’s version of carpal tunnel syndrome in the wrist.
Causes include flat feet, ankle injuries, swelling from arthritis, or cysts that crowd the tunnel. Tight shoes can worsen it. A common office test involves tapping on the nerve at the ankle; if this reproduces your burning or tingling, it points toward compression rather than a whole-body nerve problem. Treatment often starts with better footwear and orthotics, with surgery reserved for cases that don’t respond.
Chemotherapy
Many cancer-fighting drugs are toxic to peripheral nerves. This side effect, known as chemotherapy-induced peripheral neuropathy, produces a “glove and stocking” pattern of burning, numbness, and tingling in the hands and feet. Taxane-based drugs and platinum-based drugs carry the highest risk, though several other classes of chemotherapy can cause it as well. Symptoms can start during treatment and sometimes persist for months or years after chemotherapy ends.
Athlete’s Foot and Other Skin Conditions
Burning in the feet doesn’t always signal nerve damage. A fungal infection like athlete’s foot causes burning, itching, and cracked, scaly skin, especially between the toes. The key difference is that this type of burning comes with visible skin changes and tends to be localized to the affected area rather than spreading in a stocking pattern. Contact dermatitis from shoes, detergents, or socks can produce similar surface-level burning. These conditions respond to antifungal or anti-inflammatory treatments and don’t involve nerve injury.
Erythromelalgia
This rare condition causes episodes of intense burning, redness, and warmth in the feet, sometimes lasting minutes and sometimes hours. Triggers include exercise, warm rooms, hot drinks, spicy food, and even wearing socks or enclosed shoes. About 15 percent of cases are caused by mutations in the SCN9A gene, which controls a sodium channel in pain-sensing nerve fibers. The mutation makes these channels open too easily and stay open too long, flooding the nerves with pain signals. The remaining cases are linked to other conditions such as blood disorders or autoimmune diseases, or have no identified cause.
How Burning Feet Are Diagnosed
The diagnostic process depends on the suspected cause. Blood tests checking glucose levels, B12, kidney function, and inflammatory markers are usually the starting point. A nerve conduction study measures how fast electrical signals travel through the nerves in your legs; for the sural sensory nerve in the lower leg, speeds below 40 meters per second suggest damage, while the tibial motor nerve’s lower limit ranges from about 34 to 44 meters per second depending on age and height.
If those tests are normal but symptoms persist, a skin biopsy to count small nerve fibers is the next step. For suspected compression, physical examination and imaging of the ankle can pinpoint the problem. The pattern of your symptoms matters too: burning that’s worse at night and affects both feet equally points toward a metabolic cause, while burning on one side or in a specific area suggests compression or a local problem.