Burning sensations in the feet most commonly result from nerve damage, a condition called peripheral neuropathy. Diabetes is the single most frequent cause, but the list extends well beyond blood sugar problems to include vitamin deficiencies, alcohol use, compressed nerves, kidney disease, thyroid disorders, infections, and even certain medications. Understanding which cause fits your situation depends on the pattern of symptoms, when they started, and what else is going on with your health.
Diabetes and Nerve Damage
Persistently high blood sugar is the leading cause of burning feet worldwide. Over time, elevated glucose triggers a chain of damage inside nerve cells: it ramps up the production of harmful molecules called reactive oxygen species, which accumulate in the energy-producing parts of cells and gradually destroy them. The nerves most vulnerable are the thin pain-sensing fibers that extend to the feet and toes, which is why burning typically starts there before moving upward.
The damage is not limited to the nerves themselves. High blood sugar also injures the tiny blood vessels that supply oxygen to those nerves. Vessel walls thicken, blood flow decreases, and the nerve endings farthest from the heart (your feet) become starved of oxygen. This combination of direct nerve toxicity and reduced blood supply creates the classic pattern: burning, tingling, or numbness that is worst in the soles and toes and often flares at night. The surviving nerve fibers can become hypersensitive, firing pain signals in response to stimuli that shouldn’t hurt, like bedsheets resting on your feet.
Importantly, you don’t need a diabetes diagnosis for this to happen. People with prediabetes or chronically elevated blood sugar that hasn’t crossed the official diagnostic threshold can still develop neuropathy.
Vitamin B12 Deficiency
Vitamin B12 plays a direct role in building and maintaining the protective coating around nerves, called the myelin sheath. When B12 levels drop too low, the body produces abnormal fatty acids that destabilize that coating, leading to demyelination. Without intact myelin, nerve signals misfire, producing burning, tingling, and numbness that often starts in the feet.
Neuropathy risk rises when serum B12 falls below roughly 205 ng/L. A large review of 32 studies found that people below this cutoff were about 50% more likely to develop neuropathy. Common reasons for low B12 include a vegan or vegetarian diet without supplementation, long-term use of acid-reducing stomach medications, and conditions that impair nutrient absorption in the gut, such as celiac disease or Crohn’s disease. Older adults are also at higher risk because stomach acid production, which is needed to release B12 from food, declines with age.
Alcohol-Related Nerve Damage
Heavy, prolonged alcohol use can damage peripheral nerves through two overlapping mechanisms: direct toxicity to nerve fibers and nutritional deficiencies caused by poor diet and impaired absorption. Research suggests the threshold for developing alcohol-related neuropathy is roughly the equivalent of about 10 ounces of 86-proof liquor per day sustained over several years. In one study, 41% of patients who exceeded a certain lifetime alcohol intake per kilogram of body weight met criteria for the condition.
The burning and tingling typically develop gradually and affect both feet symmetrically. Because alcohol and nutritional deficiency often go hand in hand, it can be difficult to separate the two causes, and in practice both are usually addressed together.
Small Fiber Neuropathy
Sometimes standard nerve conduction tests come back normal even though burning foot pain is clearly present. This is a hallmark of small fiber neuropathy, where only the thinnest nerve endings in the skin are damaged. These fibers are too small for conventional electrical testing to detect.
The gold-standard diagnostic tool is a skin punch biopsy, a quick procedure where a tiny sample of skin (usually from the ankle or lower leg) is examined under a microscope to count the density of nerve fibers in the outer layer of skin. A reduced count confirms the diagnosis. This test has a sensitivity and specificity of 88 to 92%, making it highly reliable. It can also be repeated over time to track whether the condition is progressing.
Small fiber neuropathy has many possible triggers, including diabetes, autoimmune conditions, and sometimes no identifiable cause at all. The defining symptom is burning pain in the feet, often described as walking on hot coals, with little or no numbness early on.
Nerve Compression in the Ankle
Tarsal tunnel syndrome is essentially the foot’s version of carpal tunnel syndrome. The posterior tibial nerve passes through a narrow channel behind the inner ankle bone, and anything that compresses it there, such as swelling, a cyst, flat feet, or an ankle injury, can produce burning and tingling along the sole of the foot.
A telltale feature is that symptoms worsen with standing, walking, or physical activity and improve with rest. Pain often flares at night. Pointing your foot upward and turning it outward stretches the nerve in the tunnel, and if that movement reproduces the burning, it strongly suggests compression at that site. Unlike neuropathy from diabetes or B12 deficiency, tarsal tunnel syndrome usually affects only one foot.
Kidney Disease
Advanced kidney disease can cause burning feet through a condition called uremic neuropathy. When the kidneys can no longer filter waste products effectively, various toxins build up in the bloodstream. One key factor appears to be chronically elevated potassium levels, which alter the electrical properties of nerve membranes and disrupt normal signaling. The degree of nerve dysfunction correlates with serum potassium concentration.
Burning feet from kidney disease typically develop in later stages of the illness and affect both feet equally. If you already have a kidney disease diagnosis and notice new burning or tingling in your feet, it signals that nerve involvement has begun.
Thyroid Disorders
An underactive thyroid can lead to burning feet through a less obvious mechanism: fluid retention. In hypothyroidism, sugary gel-like substances accumulate in the spaces between tissues, drawing in water and causing swelling. When this swelling builds up around nerves, particularly in tight spaces like the ankle, it compresses them. The result is the same kind of burning and tingling seen in tarsal tunnel syndrome, but driven by a hormonal imbalance rather than a structural problem.
Chemotherapy
Burning, tingling, and pain in the feet are among the most common side effects of several cancer treatment drugs. The damage is dose-dependent, meaning it worsens as the total cumulative dose increases over the course of treatment. Patients report symptoms ranging from tingling and tightness to sharp, stabbing, or burning pain. About half of patients receiving certain targeted cancer therapies develop some degree of nerve involvement. In many cases the symptoms improve after treatment ends, but for some people they persist long-term.
Fungal Infections
Not every case of burning feet involves nerve damage. Athlete’s foot, a common fungal skin infection, can cause burning along with itching and cracked, scaly skin between the toes. The burning from a fungal infection tends to be superficial rather than deep, and it’s usually accompanied by visible skin changes. It responds well to antifungal treatment, making it one of the most easily resolved causes on this list.
Erythromelalgia
This rare condition causes episodes of intense burning pain accompanied by visible redness and warmth in the feet. Symptoms typically begin as itching before escalating to severe burning. During a flare, the affected skin turns red and may swell slightly. Episodes are triggered by warmth, exercise, standing, or wearing tight shoes, and they tend to worsen at night, likely due to rising skin temperature under blankets. Flares can last anywhere from minutes to days. In chronic cases, small ulcers may develop on the toes. Cooling the feet provides temporary relief, which distinguishes erythromelalgia from most other causes of burning feet.
How to Narrow Down the Cause
The pattern of your symptoms offers important clues. Burning that affects both feet symmetrically and worsens gradually over months points toward a systemic cause like diabetes, B12 deficiency, alcohol use, or kidney disease. Burning in only one foot suggests a structural problem like nerve compression. Burning that comes and goes in episodes with visible redness and warmth fits erythromelalgia. Burning between the toes with flaky skin is likely fungal.
Timing also matters. Symptoms that started during or shortly after chemotherapy have an obvious connection. Burning that developed alongside fatigue, weight gain, and cold intolerance could implicate thyroid disease. New burning in someone with known kidney disease points to uremic neuropathy.
Blood tests for blood sugar, B12, kidney function, and thyroid hormones can rule in or rule out the most common metabolic causes. If those come back normal, a skin punch biopsy can check for small fiber neuropathy, and imaging or nerve conduction studies can evaluate for compression. In many cases, identifying and treating the underlying condition slows or stops the nerve damage, though recovery of nerve fibers that have already been lost can be slow.