what causes muscle spasms and cramps
Muscle spasms and cramps. Cramps are caused by muscle spasms, involuntary contractions of one or more muscles. In addition to the foot and calf muscles, other muscles prone to spasms include the front and back of the thigh, the hands, arms, abdomen and muscles along the ribcage.uscle cramps can have many possible causes. They include: 1  Poor blood circulation in the legs. 2  Overexertion of the calf muscles while exercising. 3  Insufficient stretching before exercise.