muscle cramp, a sudden intermittent pain in almost any part of the body. It may involve involuntary contractions of variable duration and be accompanied by spasms. Cramps may develop in striated muscle as a result of exertion, high temperature, and excessive loss of sodium, potassium, and magnesium through perspiration. Cramps can also be associated with arthritic conditions and exposure to cold. See also heat cramp.
