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.

Hemifacial spasm (HFS) is a rare movement disorder that causes involuntary muscle contractions on one side of the face. It typically starts with painless but annoying twitching around one eye. Over ...

From standing on your head and pressing on your eyeballs to breathing through a paper bag and chewing on a lemon, people will do just about anything to get rid of hiccups. The sudden, involuntary ...