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 ...

Chorea-acanthocytosis is a rare genetic disorder of the nervous system. It causes involuntary jerks and twitches in the muscles, known as chorea, and star-shaped red blood cells, known as ...

It has happened to many of us. While in the middle of work, a study session or just spending time with friends, your eyelid flutters for no apparent reason. At first, it may be nothing more than a ...

Eye twitching, medically termed myokymia, is a frequent condition experienced by many people. While it is usually harmless, caused by stress, fatigue, lack of sleep, or excessive caffeine, persistent ...

Hypnic jerks, or the involuntary muscle twitches and glitches that jolt us awake, are harmless bodily reactions to stress and other stimulants—but what causes them?

That sudden jolt or twitch just as you’re drifting into sleep isn’t your imagination. It’s a real physiological event. One moment, you’re fading into slumber, and the next, your arm or leg flings out ...