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.

Add Yahoo as a preferred source to see more of our stories on Google. Many of us have felt a muscle in some part of our body suddenly and involuntarily tighten, causing a twitch or even severe cramp.

Body twitches, tingles, and mini spasms are rarely random. They reflect how the nervous system responds to stress, fatigue, ...

People sometimes refer to neurological conditions that cause dystonia (involuntary movement) as “dystonias.” There are many types, and they can affect people of different ages and in different ways.

Céline Dion revealed that she's been diagnosed with stiff person syndrome on Thursday. Stiff person syndrome is a very rare neurological disorder that causes progressive muscle stiffness and painful ...

Stiff person syndrome (also known as SPS, Moersch-Woltman syndrome, and stiff man syndrome) is a very rare condition that can cause your muscles to become rigid or spasm. This is a progressive ...