A cramp is a colloquial folk description of a muscle spasm in the calf area, also known as a cramp. Cramps often occur in the lower legs or toes and are painful for a long time, making the local muscles stiff and tight. Cramps are triggered by overexertion in daily life, regular sports, and long distance walking. It may also be stimulated by wind and cold, as well as calcium and potassium deficiency and malnutrition, which can trigger cramps in patients. Patients with leg cramps can be relieved with appropriate local heat packs and local massage. If cramps occur frequently, the patient had better go to the hospital in time.