slow-twitch muscle fibers, which move more slowly but help to keep you moving longer fast-twitch muscle fibers, which help you move faster, but for shorter periods “Twitch” refers to the contraction, ...

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 ...

Muscle twitches can occur for many reasons, such as a lack of sleep, caffeine use, nutrient deficiencies, overexertion, and stress. Depending on the cause, treatments and remedies may help relieve ...

Leg twitching is a sudden contraction or release of a muscle. Leg twitching when trying to relax can sometimes be a sign of a health condition, such as restless leg syndrome. When signal misfires ...

The involuntary contraction of muscles that occur when your knee twitches, are usually caused by the muscles in your thigh, rather than the knee itself. The occasional twitch of your knee (or any body ...

Add Yahoo as a preferred source to see more of our stories on Google. You’re relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it’s a muscle in your arm, your leg, or your ...

Doctors identify these movements as 'fasciculations', because they occur when individual nerve fibers, which control small muscle groups activate independently to produce brief muscle contractions.