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.

Geisinger neurologists now use Botox to reduce spasms and ease pain associated with involuntary muscle movement problems. About 300,000 people in the U.S. suffer from some form of dystonia, a movement ...

Though many people experience muscle twitching, it's often incorrectly identified as a muscle spasm. While both are involuntary contractions of a muscle, muscle spasms and muscle twitching aren't ...