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.

Acetylcholine (ACh) rechallenge may be a novel method to improve detection of coexisting coronary spasm endotypes, and at the same time, assess the treatment response to nitrate-based therapies, a new ...

What Are Hiccups?- Hiccups are sudden, involuntary spasms of the diaphragm, the muscle located between the lungs and stomach.- This spasm pulls air into the throat, causing the vocal cords to close ...