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 ...

Ever been sound asleep, only to be startled awake by a stabbing pain in your calf or hamstring? These sudden, intense muscle spasms are better known as charley horses. And they happen to up to 60% of ...

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That sudden, excruciating tightening in your calf or foot might be more than just an annoying interruption to your day or sleep. While occasional muscle cramps affect nearly everyone at some point, ...