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When only one hand is tingling it is usually a sign of a pinched nerve. If the hand is under stress or repeatedly being used in the same position, carpal tunnel syndrome is a likely cause. But tingling in the left hand that suddenly extends to the arm and jaw could be a sign of a heart attack.
Hand numbness is commonly the result of an injury or conditions that put pressure on nerves in one or both hands, called nerve compression. Often this can feel like a dull burning sensation, numbness and tingling, or pins-and-needles. Learn the causes and treatments.