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.

Courtney Southwick is a writer focusing on health, nutrition, and disease. She has been blogging for the past two years at CourtneySouthwick.com. She writes blogs and articles for online publications ...

Add Yahoo as a preferred source to see more of our stories on Google. Ever been sound asleep, only to be startled awake by a stabbing pain in your calf or hamstring? These sudden, intense muscle ...

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 foot that begins to spasm—sometimes for a few seconds, sometimes for ...

We've all been there before. Running along the basketball court or swimming across the pool, when, all of a sudden, we experience a sharp pain in our foot or leg. Muscle cramps are common, affect ...