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 ...

Medically reviewed by Edmund Khoo, DDS Lockjaw (trismus) is a painful condition that limits your ability to open your mouth all the way. It occurs when the muscles you use to chew spasm, meaning they ...

At one point or another, we’ve all experienced the unexpected, intense pain of a muscle cramp. Muscle cramps, also known as muscle spasms or charley horses, are the involuntary contraction of ...

Six days after the Oregon boy got the cut, according to the CDC report, he had "episodes of crying, jaw clenching, and involuntary upper extremity muscle spasms," then had arching in his back and ...