NCIt related terms : Cramp(s) /Muscle Spasm(s); Muscle Cramping; Spasm;
NCIt definition : A sustained, sudden and involuntary contraction of a muscle or group of muscles.;
Alternative definition : NICHD: Sudden and involuntary contraction of a muscle or group of muscles.; NCI-GLOSS: A sharp pain that occurs when a muscle suddenly contracts (tightens up).
Cramps commonly occur in the abdomen and legs.;