Foot neuropathy happens when nerves that carry sensation to and from your feet become damaged, and the single most common cause is diabetes. Nearly half of all people with diabetes develop some form of peripheral neuropathy over their lifetime. But diabetes is far from the only culprit. Vitamin deficiencies, alcohol use, certain medications, autoimmune conditions, kidney disease, inherited disorders, and even physical compression of nerves in the foot can all trigger or contribute to nerve damage.
Diabetes and High Blood Sugar
Persistently elevated blood sugar is the leading cause of foot neuropathy worldwide. About 47% of people with diabetes have some degree of peripheral nerve damage, based on a large American study. The mechanism is straightforward: when blood sugar stays high, nerve cells absorb more glucose than they can process through their normal energy pathways. The excess gets converted into byproducts (sorbitol and fructose) that accumulate inside the nerve, causing swelling, inflammation, and gradual destruction of the nerve fibers themselves.
Because the longest nerves in your body run from your spinal cord all the way to your toes, they’re the most vulnerable to this kind of damage. That’s why diabetic neuropathy almost always starts in the feet before working its way upward. The earliest signs are usually tingling, numbness, or a burning sensation in the toes and soles. Over time, you may lose the ability to feel temperature changes, pressure, or even cuts and blisters, which is why foot injuries in people with diabetes can go unnoticed and become serious.
Vitamin Deficiencies
Your nerves need specific nutrients to maintain their protective outer coating and transmit signals properly. Vitamin B12 is the most important one for nerve health, and being low in it is surprisingly common, especially in older adults. The standard clinical cutoff for B12 deficiency is relatively low, but research from the journal Neurology suggests that the threshold for optimal nerve function may be roughly 2.7 times higher than that clinical cutoff. In practical terms, your B12 levels could be flagged as “normal” on a blood test while still being too low to protect your nerves.
B12 deficiency can develop from long-term use of acid-reducing medications, digestive conditions that impair nutrient absorption (like celiac disease or Crohn’s disease), strict vegan diets without supplementation, or simply aging, since the stomach produces less of the acid needed to extract B12 from food as you get older. Other B vitamins, particularly B6 and B1 (thiamine), also play roles in nerve maintenance, and deficiency in any of them can contribute to foot neuropathy.
Alcohol Use
Heavy, prolonged alcohol consumption damages peripheral nerves through several overlapping mechanisms. Alcohol disrupts the signaling pathways that nerves rely on for growth and repair, impairs the production of proteins essential to nerve structure, and generates oxidative stress that directly injures nerve cells. It also activates pain-sensing channels in the nerve fibers themselves, which is why alcohol-related neuropathy often presents with burning pain rather than just numbness.
Interestingly, research has not consistently established a clear dose-dependent relationship between total lifetime alcohol intake and the severity of nerve damage. Some heavy drinkers develop neuropathy relatively quickly while others do not, suggesting that individual vulnerability, nutritional status (particularly thiamine levels, which alcohol depletes), and genetic factors all play a role in determining who gets hit hardest.
Chemotherapy and Other Medications
Certain cancer treatments are well known for causing peripheral neuropathy, a condition specifically called chemotherapy-induced peripheral neuropathy (CIPN). Platinum-based drugs, taxanes, vinca alkaloids, and several drugs used for blood cancers are the most frequent offenders. Symptoms can appear during treatment or emerge afterward, and in rare cases they develop years after the last dose.
Beyond chemotherapy, other medications can cause foot neuropathy as a side effect. Some antibiotics, anti-seizure drugs, and heart medications carry this risk. If you’ve noticed new tingling or numbness in your feet after starting a medication, that connection is worth raising with whoever prescribed it.
Autoimmune Conditions
Your immune system can sometimes turn against your own nerves. One of the more recognizable forms of this is chronic inflammatory demyelinating polyneuropathy (CIDP), where the immune system attacks the insulating coating around nerve fibers. CIDP develops slowly over months, starting with weakness and tingling in the hands or feet, difficulty walking or climbing stairs, and gradually worsening loss of reflexes and muscle bulk.
Guillain-Barré syndrome is a related but more acute version, where nerve damage comes on rapidly over days to weeks, often after an infection. Other autoimmune diseases, including lupus, rheumatoid arthritis, and Sjögren’s syndrome, can also cause neuropathy through inflammation that damages small nerve fibers in the feet.
Kidney Disease
As kidney function declines, waste products build up in the blood that would normally be filtered out. These toxins are directly harmful to nerve tissue. In people with advanced kidney failure (where the kidneys are filtering at less than 15% of normal capacity), the prevalence of neuropathy ranges from 60% to 100%. Many of these cases are “silent,” meaning the nerve damage shows up on testing before the person notices symptoms. Dialysis can help by clearing some of the toxins, but it doesn’t fully reverse nerve damage that has already occurred.
Inherited Nerve Disorders
Charcot-Marie-Tooth disease is the most common inherited neuropathy, caused by gene changes that either damage the nerves directly or break down their protective outer coating. It typically appears in adolescence or early adulthood with a distinctive pattern of foot-specific symptoms: high arches, curled toes (hammertoes), weakness in the ankles, frequent tripping, and difficulty lifting the front of the foot while walking (footdrop). Muscle wasting in the lower legs and feet is common as the condition progresses. These gene changes usually run in families, though new mutations can appear without any family history.
Nerve Compression in the Foot
Sometimes neuropathy in the feet isn’t caused by a systemic disease at all but by direct pressure on a nerve. Tarsal tunnel syndrome occurs when the tibial nerve, which runs along the inside of your ankle, gets compressed. This creates burning, tingling, or numbness in the sole of the foot, often worsening with standing or walking.
Several structural problems can trigger it: flat feet or fallen arches that stretch the nerve with every step, swelling from an ankle sprain, a ganglion cyst or bone spur pressing against the nerve, varicose veins in the area, or swollen tendons. Conditions like arthritis and diabetes can also cause enough local swelling to compress the nerve. Unlike most other causes of foot neuropathy, tarsal tunnel syndrome often affects just one foot.
How Foot Neuropathy Is Detected
The most widely used screening tool is the monofilament test, where a thin nylon fiber is pressed against your foot to check whether you can feel light pressure. It’s considered the best single indicator of lost protective sensation, but its accuracy varies considerably. Studies show its sensitivity ranges from about 41% to 93%, meaning it can miss a substantial number of cases depending on how and where it’s applied.
Because of this variability, a proper evaluation for foot neuropathy uses multiple tests together: the monofilament for pressure sensation, a tuning fork on the big toe for vibration, a pin for sharpness, and a check of your ankle reflexes. Nerve conduction studies, which measure how fast electrical signals travel through your nerves, can confirm the diagnosis and help pinpoint the type and severity of damage. The combination matters because no single test is reliable enough on its own.
When Multiple Causes Overlap
In many people, foot neuropathy doesn’t have just one cause. Someone with diabetes who also drinks heavily and takes a medication with nerve-damaging potential faces compounding risk. A person with borderline B12 levels and early kidney disease may develop symptoms earlier than either condition alone would predict. Identifying all contributing factors is what makes neuropathy manageable, because addressing even one of them (bringing blood sugar under control, correcting a vitamin deficiency, stopping an offending medication) can slow the progression or reduce symptoms even when the underlying damage can’t be fully reversed.