Several: -sitting or standing in the same position for a long time -shingles -lack of blood supply to an area like frostbite - pressure on peripheral nerves from tumors , scar tissues or enlarged blood vessels - injury to a nerve -medical conditions like diabetes, migraine, stroke , carpal tunnel syndrome, multiple sclerosis -abnormal levels of calcium, potassium or sodium -nerve damage due to lead, alcohol.
Answered 7/29/2012
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