Tingling Sensations

Tingling, or paraesthesia, is an abnormal sensation of pins and needles, buzzing or crawling, usually in the hands or feet. Brief positional tingling that resolves on moving is normal. Persistent or recurring tingling is worth taking seriously, because the causes divide into the compressive and the systemic and both are treatable if identified. Compression causes follow a nerve territory: carpal tunnel syndrome affects the thumb, index and middle fingers and is often worst at night, while cervical or lumbar nerve root compression produces tingling in a band down the arm or leg. Systemic causes produce a symmetrical glove-and-stocking pattern - diabetes is the commonest, followed by B12 deficiency, thyroid disease, alcohol, chemotherapy and some medications including metformin, which lowers B12 over years. The key point is timing: B12-related nerve damage becomes permanent if left untreated, so serum B12 with methylmalonic acid where borderline should come before any self-treatment. Supplement use should follow the test result. B12 replacement corrects deficiency-related tingling; alpha-lipoic acid at 600 mg/day has reasonable evidence in diabetic neuropathy symptoms; and high-dose B6 above 100 mg/day can itself cause neuropathy, which is a genuine and often missed cause.