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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.
A spasm may be a muscle contraction caused by abnormal nerve stimulation or by abnormal activity of the muscle itself. A series of spasms, or permanent spasms, is called a spasmism. A spasm may lead to muscle strains or tears in tendons and ligaments if the force of the spasm exceeds the tensile strength of the underlying connective tissue.