The essentials

Brief pins and needles after sitting on a foot is harmless. Tingling or numbness in both feet that keeps coming back usually points to nerve damage, most often from diabetes or low vitamin B12. Sudden numbness on one side of the body, or weakness that climbs the legs, needs 911.

Doctors call tingling, prickling or a "foot asleep" feeling paresthesia. It can happen anywhere, but it is most often felt in the hands and feet[1]. When the long nerves to the feet are damaged, the problem is called peripheral neuropathy. It usually starts in the toes and creeps upward before reaching the hands[3]. Almost 1 in 10 people aged 55 or over in the UK have it[3]; in a Dutch study, over half of them had never been diagnosed[8].

When is tingling in the feet an emergency?

When to see a doctor

  • Emergency: call 911 for sudden numbness or weakness on one side of the body, a drooping face, slurred speech or vision change (stroke signs)[12]; weakness climbing from the legs over hours or days, or trouble breathing or swallowing (possible Guillain-Barré syndrome); numbness after a head, neck or back injury, or loss of bladder or bowel control[1][12].
  • Within 24 to 48 hours for a cut, blister or sore on a numb foot that is not healing, especially with diabetes[3][4]; or tingling that spreads quickly, new tripping or weakness in the feet[7].
  • At your next appointment for pins and needles that are constant, keep coming back[2] or get worse when you walk[1].

Why do my feet tingle? Harmless causes first

  • Common Pressure on a nerve. Crossed legs, tight shoes or sleeping in one position briefly cut the blood supply to the nerve. It fades within minutes once you move[2].
  • Possible Breathing too fast. During anxiety or panic, hyperventilation can cause pins and needles, often with trembling hands[2].

What medical conditions cause tingling feet?

  • Common Diabetes and prediabetes. Diabetes is the most common cause of peripheral neuropathy[3]. Up to half of people with diabetes develop it, usually in both feet and often worse at night[4]. See our diabetes symptoms and tests guide.
  • Common A pinched nerve in the lower back. Pain and tingling that run from the back down one leg to the foot suggest sciatica[2].
  • Possible Low vitamin B12. Tingling in the hands and feet is a typical sign[10]. Risk is higher with a vegan diet, celiac or Crohn's disease, stomach surgery, age over 75 and long-term metformin[4][10]. Read more in vitamin B12 blood levels.
  • Possible Alcohol and medicines. Heavy drinking, chemotherapy and some seizure, HIV or antibiotic medicines can damage nerves[2]. Never stop a medicine on your own.
  • Possible Thyroid and kidney disease. An underactive thyroid and chronic kidney disease are classic treatable causes[5][9].
  • Possible Poor circulation. Narrowed leg arteries can cause tingling that worsens with walking[1].
  • Rare Multiple sclerosis, Guillain-Barré syndrome. Pins and needles that move between body parts can be a sign of multiple sclerosis[2]. Guillain-Barré often follows an infection and weakens both legs within days[12].
  • Rare Other causes. Multiple myeloma, HIV, Lyme disease, syphilis, lead and inherited nerve diseases are checked when the usual causes are absent[1][5][9].

Causes often add up: in that Dutch (Rotterdam) study, diabetes (34%) and vitamin deficiencies (15%) led, and 1 in 5 people had several risk factors[8]. Having diabetes does not end the search for another cause[9].

What blood tests check for causes of tingling feet?

Neurology guidelines name three high-yield tests: blood glucose, vitamin B12 with methylmalonic acid, and serum protein electrophoresis[6]. Family doctors add a blood count, a metabolic panel, a sedimentation rate and TSH[5].

Blood tests a doctor may order for tingling or numb feet
TestWhat it looks forGood to know
Fasting glucose and HbA1cDiabetes or prediabetesIf both are normal, a glucose tolerance test may be considered[6][7]
Vitamin B12, with methylmalonic acid (MMA)B12 deficiencyMMA or homocysteine settles a borderline B12[6]
Serum protein electrophoresis with immunofixationAn abnormal protein made by blood cellsOne of the three highest-yield tests[6]
TSHUnderactive thyroidOften in the first round[5]
Metabolic panel (creatinine, eGFR, liver tests, electrolytes)Kidney or liver disease, abnormal calcium, potassium or sodiumOne blood draw[1][7]
Complete blood count, sedimentation rate, CRPAnemia, inflammationLarge red cells point back to B12 or folate[10]
By context: folate, HIV, Lyme, hepatitis, heavy metalsLess common causesOrdered when your story suggests them[1][5]

The nerves are checked by examination (tuning fork, nylon monofilament, walking, balance)[4], then by nerve conduction studies and EMG if the cause stays unclear[5]. One-sided, fast or weakness-first symptoms call for a neurologist[7].

Got your results? BloodSense explains every line of your report in plain words, so you know what to ask about your tingling feet.

Explain my results

How do I read my results?

Fictitious example of a lab report, man aged 62 on metformin for 8 years, tingling in both feet (United States format)
TestResultReference rangeFlag
Hemoglobin A1c7.6 %4.0-5.6 %H
Glucose, fasting148 mg/dL70-99 mg/dLH
Vitamin B12262 pg/mL232-1,245 pg/mL
Methylmalonic acid0.52 µmol/L0.00-0.40 µmol/LH
TSH2.4 mIU/L0.45-4.5 mIU/L
eGFR81 mL/min/1.73 m²≥60
  1. H means above this lab's range. An HbA1c of 6.5% or more is in the diabetes range; 5.7 to 6.4% is prediabetes[11]. Years of high glucose damage the nerves[4].
  2. B12 has no flag: this lab's range starts at 232. Values under 299 pg/mL can mean a deficiency, to be confirmed with MMA[10].
  3. MMA is high: the body lacks B12 although the B12 number looks acceptable[10]. Metformin is one known cause[4].
  4. TSH and eGFR are normal: thyroid and kidney causes are unlikely. Two treatable causes add up here.

Glucose, HbA1c, B12 and MMA

An HbA1c below 5.7% is normal, 5.7 to 6.4% is prediabetes and 6.5% or more is diabetes; a high result is usually confirmed by a second test[11]. People with diabetes should have their feet checked at least once a year[9]. B12 ranges differ between labs; MMA shows that a deficiency exists, not how severe it is[10]. On metformin, ask whether B12 should be checked: the medicine can usually be continued with B12 added[4].

When everything is normal

A high TSH suggests an underactive thyroid[11]; an abnormal band on electrophoresis is explained in our SPEP results guide. If all tests are normal, the cause may stay unknown: about 1 in 3 people with neuropathy in the Rotterdam Study had no known risk factor[8].

What should I note before the appointment?

  • Where (one foot or both, hands too) and since when; is it spreading?
  • Tingling, burning, numbness or tripping; worse at night or when walking?
  • Diabetes, thyroid or kidney disease, vegan diet, alcohol, stomach surgery
  • All medicines and supplements, with start dates (metformin, chemotherapy, B12)
  • Any foot sore you did not feel

Questions to ask your doctor

  1. Is this nerve damage, a pinched nerve or circulation?
  2. Should my B12 be checked with MMA, since I take metformin?
  3. Do I need protein electrophoresis or a nerve conduction study?
  4. How should I check my feet each day?

Frequently asked questions

What vitamin deficiency causes tingling in hands and feet?

Mainly B12. Low B1, B6 or folic acid can also cause it[1]. Do not start high-dose supplements before the blood test or without advice.

Why does tingling in my feet get worse at night?

Neuropathy is often worse at night[4]. An evening urge to move the legs is a different problem: restless legs syndrome. A hard, painful calf is a night leg cramp.

Can nerve damage in the feet get better?

Sometimes, if the cause is treated early; in others the damage stays or slowly worsens[3]. Good glucose control limits further damage[4].

What about tingling in the hands only?

Tingling mainly in the hand and fingers can come from carpal tunnel syndrome, pressure on a nerve at the wrist[1]. Hands and feet together point instead to a nerve problem affecting the whole body[3].

References

  1. MedlinePlus Medical Encyclopedia. Numbness and tingling. medlineplus.gov (accessed November 13, 2026)
  2. NHS. Pins and needles. nhs.uk (accessed November 13, 2026)
  3. NHS. Peripheral neuropathy. nhs.uk (accessed November 13, 2026)
  4. NIDDK. Peripheral neuropathy. niddk.nih.gov (accessed November 13, 2026)
  5. Azhary H, Farooq MU, Bhanushali M, et al. Peripheral neuropathy: differential diagnosis and management. Am Fam Physician. 2010;81(7):887-892. aafp.org (accessed November 13, 2026)
  6. England JD, Gronseth GS, Franklin G, et al. Practice parameter: evaluation of distal symmetric polyneuropathy: role of laboratory and genetic testing. Neurology. 2009;72(2):185-192. doi:10.1212/01.wnl.0000336370.51010.a1 (accessed November 13, 2026)
  7. Callaghan BC, Price RS, Feldman EL. Distal symmetric polyneuropathy: a review. JAMA. 2015;314(20):2172-2181. doi:10.1001/jama.2015.13611 (accessed November 13, 2026)
  8. Taams NE, Drenthen J, Hanewinckel R, et al. Prevalence and risk factor profiles for chronic axonal polyneuropathy in the general population. Neurology. 2022;99(20):e2234-e2240. doi:10.1212/WNL.0000000000201168 (accessed November 13, 2026)
  9. American Diabetes Association. 12. Retinopathy, neuropathy, and foot care: Standards of Care in Diabetes-2025. Diabetes Care. 2025;48(Suppl 1):S252-S265. doi:10.2337/dc25-S012 (accessed November 13, 2026)
  10. MedlinePlus. Vitamin B12 level; Methylmalonic acid (MMA) test. medlineplus.gov, medlineplus.gov (accessed November 13, 2026)
  11. MedlinePlus. Hemoglobin A1C (HbA1c) test; TSH test. medlineplus.gov, medlineplus.gov (accessed November 13, 2026)
  12. MedlinePlus Medical Encyclopedia. Stroke; Guillain-Barré syndrome. medlineplus.gov, medlineplus.gov (accessed November 13, 2026)

This article is general health information. It does not replace a medical examination, diagnosis or treatment. Do not stop or change a medicine, or start a supplement, without talking to your doctor or pharmacist.