Roughly 20 to 30 million Americans live with some form of peripheral neuropathy, the umbrella term for damage to the nerves outside the brain and spinal cord. Diabetes drives about half of cases, but more than 100 distinct causes have been identified — from chemotherapy drugs to vitamin deficiencies to autoimmune disease. The hallmark symptoms of burning, tingling, numbness, and weakness in the feet and hands often start subtly and worsen over months or years if the underlying cause goes unaddressed.
What Goes Wrong in Neuropathy
Peripheral nerves carry signals between the central nervous system and the rest of the body. They include sensory fibers (which transmit touch, temperature, and pain), motor fibers (which control muscles), and autonomic fibers (which regulate blood pressure, sweating, digestion, and heart rate). Different neuropathies damage different fiber types, which is why one patient may have severe burning pain while another has mostly weakness or dizziness.
According to the NINDS, neuropathy can be classified by which nerves are involved (mono-, multi-, or polyneuropathy), the underlying mechanism (demyelinating vs axonal), and the cause. Diabetic peripheral neuropathy, the most common form in the US, typically begins as a length-dependent sensory polyneuropathy — meaning symptoms start in the longest nerves first, in the toes and feet.
The Many Causes
Diabetes is the leading cause, affecting up to 50 percent of people with the disease over their lifetime. Roughly half of people with diabetic neuropathy have no symptoms, raising the risk of unnoticed foot injuries and amputations.
Other major causes include alcohol-related neuropathy, B12 and folate deficiency, chemotherapy (especially platinum compounds, taxanes, and bortezomib), HIV, autoimmune conditions like Guillain-Barré syndrome and CIDP, hereditary neuropathies such as Charcot-Marie-Tooth disease, hypothyroidism, kidney disease, and exposure to heavy metals or toxins. Idiopathic neuropathy — meaning no identifiable cause despite thorough workup — accounts for about 25 to 30 percent of cases per the Mayo Clinic.
Symptoms by Fiber Type
Sensory symptoms include numbness, tingling, burning, electric-shock sensations, and pain that often worsens at night. Some patients describe walking on sand, on broken glass, or with socks bunched up under their feet. Loss of vibration sense and proprioception leads to balance problems, especially in the dark.
Motor symptoms involve weakness, muscle wasting, foot drop, and difficulty with fine hand movements like buttoning shirts. Autonomic symptoms — common in diabetes and some autoimmune neuropathies — include orthostatic hypotension, gastroparesis, urinary retention, abnormal sweating, and erectile dysfunction.
Small-fiber neuropathy preferentially damages the thin nerve fibers that carry pain and autonomic signals. It produces severe burning pain with relatively normal nerve conduction studies, which means standard testing can miss the diagnosis.
Diagnostic Workup
A careful history and exam are the foundation. Doctors test vibration with a 128-Hz tuning fork, monofilament sensation, ankle reflexes, and proprioception. Nerve conduction studies and electromyography (EMG) measure how well large fibers conduct, characterize the pattern, and distinguish demyelinating from axonal damage.
Bloodwork typically includes hemoglobin A1c (looking for diabetes), B12 and methylmalonic acid, TSH, complete metabolic panel, and serum protein electrophoresis to screen for monoclonal gammopathies that can cause neuropathy. Specialized testing may include autoantibody panels, genetic testing, skin biopsy for small-fiber neuropathy, and occasionally nerve biopsy.
Treating the Underlying Cause
The single most effective intervention for diabetic neuropathy is intensive glucose control — though benefits are stronger in type 1 diabetes than type 2. NIDDK notes that early glucose control prevents neuropathy and can slow progression once present.
For B12 deficiency, replacement (oral or injected) reverses symptoms in many patients if started before axonal damage becomes severe. Stopping causative drugs, treating hypothyroidism, abstaining from alcohol, or treating CIDP with IVIG, plasma exchange, or immunosuppressants are all examples of cause-directed therapy.
Symptom Management
Several drug classes treat neuropathic pain. The American Academy of Neurology and other guidelines list four first-line options: gabapentin, pregabalin, duloxetine, and amitriptyline (or nortriptyline). Topical capsaicin and lidocaine patches help some patients. Tramadol and tapentadol have modest evidence; conventional opioids are generally avoided due to limited long-term benefit and addiction risk.
Non-pharmacologic approaches matter. Aerobic exercise has shown small-to-moderate benefit in randomized trials. Transcutaneous electrical nerve stimulation (TENS), acupuncture, and certain compounded creams have variable evidence. Foot care — daily inspection, well-fitted shoes, podiatry follow-up — prevents the ulcers and amputations that drive much of diabetic neuropathy’s morbidity.
When to seek emergency care: Call 911 or go to the nearest emergency room if you experience rapidly progressive weakness over hours to days (possible Guillain-Barré syndrome), new bowel or bladder incontinence with leg weakness (possible cauda equina), severe orthostatic symptoms with fainting, or signs of a foot infection (redness, swelling, fever) in a person with diabetic neuropathy.
Living With Neuropathy
Falls are a major concern. Estimates suggest people with peripheral neuropathy fall up to 20 times more often than age-matched peers without it. Home modifications — adequate lighting, removed loose rugs, grab bars in bathrooms — reduce risk. Physical therapy improves balance and reduces falls in studies of older adults with neuropathy.
Sleep is often disrupted by nighttime burning. Many doctors recommend bedtime gabapentin or amitriptyline for both pain and sleep benefit. Cool sheets, foot fans, and avoiding alcohol close to bedtime help some patients. Our guide to chronic conditions covers broader management approaches.
When to See a Doctor
Persistent numbness, tingling, or burning in the feet or hands warrants evaluation, especially in people with diabetes. Sudden weakness, new balance problems, autonomic symptoms, or a known cause like chemotherapy all justify a primary care visit and possible neurology referral.
Diabetics should have annual foot exams and prompt evaluation of any new foot sores. Patients on chemotherapy should report new neuropathic symptoms — dose adjustment can sometimes prevent permanent damage. Those with autoimmune symptoms or rapid progression deserve urgent neurology referral.
Frequently Asked Questions
Can peripheral neuropathy be reversed?
Some causes are reversible. B12 deficiency, certain drug-induced neuropathies, and some autoimmune neuropathies can improve substantially with treatment. Diabetic neuropathy can stabilize and partially improve with glucose control, but established axonal damage often does not fully recover. Idiopathic neuropathy generally is not reversed.
How long does peripheral neuropathy last?
It depends on the cause. Acute neuropathies like Guillain-Barré often resolve over weeks to months. Chronic neuropathies tied to ongoing causes (diabetes, alcohol use, hereditary disease) typically persist for years. Chemotherapy-induced neuropathy improves in some patients within 6 to 12 months but persists in others.
What vitamins help peripheral neuropathy?
B12 replacement helps when deficiency is the cause. Alpha-lipoic acid has modest evidence for diabetic neuropathy in European studies. High-dose B6 actually causes neuropathy and should be avoided. Other supplements have weaker evidence and may interact with medications, so discussing them with a clinician matters.
Is peripheral neuropathy the same as fibromyalgia?
No. Fibromyalgia is a central pain syndrome with normal nerve testing, while peripheral neuropathy reflects identifiable nerve damage. The conditions can coexist. A skin biopsy showing small-fiber damage in some fibromyalgia patients suggests overlap exists in a subset.
The Bottom Line
Peripheral neuropathy is treatable but rarely curable, and the path forward depends entirely on identifying the cause. Diabetes, B12 deficiency, alcohol, autoimmune disease, and medication exposure should all be considered before settling on idiopathic. Pain medications can blunt symptoms while underlying treatment, foot care, and exercise reduce long-term complications. Anyone with persistent burning, numbness, or weakness in the feet or hands should pursue workup early — outcomes consistently favor patients who act before axonal damage becomes irreversible.