A pins-and-needles feeling that comes and goes is usually harmless — for example, from pressure on a nerve when you sit or sleep in one position, from carpal tunnel syndrome in the hands, or from hyperventilation during anxiety. It typically resolves when you move or change position.
Persistent or progressive numbness, especially in both feet or hands, can be a sign of nerve damage (neuropathy) from causes such as diabetes, vitamin B12 deficiency, thyroid problems, or excess alcohol. If tingling is ongoing, spreading, or affecting your balance or grip, see a doctor for assessment and possible blood tests.
Call your local emergency number if numbness comes on suddenly with weakness or drooping on one side of the body, slurred speech, vision changes, or confusion, as this can signal a stroke. Sudden numbness with loss of bladder or bowel control or severe back pain also needs emergency care. Informational only.