Add Yahoo as a preferred source to see more of our stories on Google. A muscle spasm, also known as a cramp, twitch or charley horse, is the sudden and involuntary forced contraction of a muscle.

Whether you call it a charley horse, a muscle spasm or a cramp, sharp muscle pains can immobilize you for a few seconds or for even 15 minutes or more. There’s nothing worse than getting a leg cramp ...