Burning feet · nerve pain
Burning, Numb or Painful Feet: What Is Actually Causing It
If your feet burn at night, feel numb, tingle, or seem strangely far away when you walk, that is not just age. And it is not something you have to accept. That burning is nerve pain. It is a signal from the smallest nerves in your body. Those nerves are usually the first to be damaged when something metabolic is going wrong.
What Are the First Signs of Nerve Damage in the Feet?
Nerves are not all the same size. The largest carry strength and position sense. The smallest carry temperature, burning, and light touch. They are thin, have no protective coating, and sit at the very end of the blood supply. They cost the most energy to run of any nerves you own, and they are the least protected.
That is why symptoms almost always start in the toes and feet, not the hands. It is also why people describe them in the same few ways:
- Burning, especially at night or when the feet are warm
- Numbness, or a sensation of walking on carpet, sand, or a thick sock
- Pins and needles, or a crawling feeling
- Sharp, electric, or stabbing pain that comes without warning
- Feet that feel unsteady or far away, which shows up as balance trouble first
A standard nerve conduction study measures the large fibers. It can be fully normal while the small fibers are being lost. Many people are told their test was fine and sent home. That is why this is so often missed.
What Causes Burning Feet?
Peripheral neuropathy describes a symptom. It is not a diagnosis. The useful question is what is causing it, because each cause responds differently.
- Metabolic. High insulin and high blood sugar damage the small vessels that feed the nerves. Glycation stiffens the tissue around them. This is the largest single group, and it is at work long before anyone is called diabetic. See blood sugar and nerve damage.
- Vascular. The nerve is fed by a tiny blood supply. When that supply narrows, the nerve starves before it dies.
- Nutritional. Low B12, B6, folate and thiamine cause neuropathy directly. Some of these shortages are caused by medicines, including long-term metformin and acid-reducing drugs.
- Toxic and medication-related. Alcohol, chemotherapy drugs, and some antibiotics are known causes.
- Autoimmune and infectious. These are a smaller share. But they change the treatment completely, so they are worth ruling in or out.
Most people have more than one cause at once. That is the normal case, not the tricky one.
How Do You Find the Cause of Burning Feet?
Finding the cause is the whole point of the workup, because treating burning feet without knowing why they burn is guesswork. A useful workup looks at nerve function, blood supply, and metabolism together, not one at a time.
That means testing the small fibers, not only the large ones. It means measuring blood flow to the foot. And it means running a metabolic panel that includes fasting insulin, not sugar alone. You can read more about what we offer on our services page.
Frequently Asked Questions
Is burning in the feet always diabetes?
No. Diabetes and prediabetes are the most common causes. But low nutrients, poor circulation, medicine side effects, alcohol, autoimmune disease and thyroid disease all cause the same symptom. It is also common to have normal blood sugar and still have a metabolic cause. See why normal lab work misses it.
My nerve test was normal. Why do my feet still burn?
A standard nerve conduction study measures large fibers. Small-fiber neuropathy, the kind that burns, can be present with a fully normal conduction study. A normal result rules out one thing. It does not rule out the problem. Our resource library covers small-fiber symptoms in more detail.
Can nerve damage improve, or is it permanent?
It depends on the cause and how long it has been going on. Nerve fibers can regrow. Studies of diet and exercise intervention have shown measurable regrowth of small fibers in the skin. What no one can promise is a specific result for a specific person. The honest answer is this: the earlier the cause is found and treated, the more there is to work with. Start with the Nerve Damage Score.
Why do my feet burn at night?
Burning at night, or whenever the feet are warm, is the classic signal of the small nerve fibers. These thin, unprotected fibers carry temperature and burning. They sit at the far end of the blood supply. So they are the first nerves to be damaged when something metabolic goes wrong. That is also why it starts in the toes and feet, not the hands.
Which vitamin deficiency can cause burning feet?
Low B12, B6, folate and thiamine all cause neuropathy directly. Some of these shortages come from medicines, including long-term metformin and acid-reducing drugs. So a person treating one condition can quietly develop another. A shortage often sits alongside a metabolic or circulation cause instead of replacing it. That is why we test the whole picture.
What blood test is done for burning feet?
We run a metabolic panel that includes fasting insulin, not sugar alone, because high insulin damages the nerves’ small blood vessels long before anyone is called diabetic. Blood work is one part of the workup. It sits alongside testing of the small fibers, not only the large ones, and a check of blood flow to the foot.
Find Out Where You Stand
Our five-question Nerve Damage Score takes about two minutes, needs no account, and gives you a plain-language report.
Prefer to just ask a question? Call or text us, or email info@regenerve.com. We are glad to talk through what is going on. There is no obligation and no pressure to become a patient. If you would rather read first, our Neuropathy Resource Library is free and there is nothing to sign up for.
Sources
- Devigili G, Tugnoli V, Penza P, et al. The diagnostic criteria for small fibre neuropathy: from symptoms to neuropathology. Brain. 2008. PMID 18524793
- Singleton JR, Smith AG, Bromberg MB. Increased prevalence of impaired glucose tolerance in patients with painful sensory neuropathy. Diabetes Care. 2001. PMID 11473085
- Smith AG, Russell J, Feldman EL, et al. Lifestyle intervention for pre-diabetic neuropathy. Diabetes Care. 2006. PMID 16732011