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.

Add Yahoo as a preferred source to see more of our stories on Google. Though many people experience muscle twitching, it's often incorrectly identified as a muscle spasm. While both are involuntary ...

A back spasm involves a sudden, involuntary muscle contraction that can be set off by something as routine as lifting a bag or sitting for too long. Muscle fatigue, dehydration, and nerve irritation ...

Muscle spasms can be a source of considerable pain in many people with fibromyalgia and chronic fatigue syndrome. Muscles clench and just won't relax, sometimes in spite of multiple treatments. These ...

Even though it can cause excruciating and debilitating muscle spasms, most people had never heard of stiff person syndrome until late last year, when singer Celine Dion announced her diagnosis. This ...

Cerebral palsy can cause muscle spasms and many other hypertonic symptoms. The symptoms can be treated in a variety of ways, often starting with physical therapy. Cerebral palsy (CP) is a group of ...

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 ...

Balo disease is a rare neurological disorder that causes muscle spasms and paralysis. Experts do not know if it shortens life expectancy. Its effects can vary significantly between people. Another ...