Calf cramps are medically known as “calf muscle spasms”. Common causes include muscle overwork, cold stimulation, calcium deficiency and other physiological factors, and may also be caused by epilepsy, tetanus and other diseases. 1. Excessive muscle fatigue: when performing strenuous exercise or after strenuous exercise, due to the increased contraction frequency of the leg muscles, or not enough muscle relaxation after exercise, resulting in excessive muscle fatigue, local accumulation of lactic acid and other metabolites, resulting in muscle spasm. 2. Cold stimulation: the calf itself is exposed to the air for a relatively long time, prolonged exposure to cold or sudden stimulation of the cold environment may affect the blood circulation in the calf area, resulting in muscle spasms and leg cramps. 3. Calcium deficiency: Calcium deficiency will make the concentration of calcium ions in the blood too low, and calcium ions can reduce the excitability of nerve-muscle joints. When the concentration of calcium ions in the blood is too low, the excitability of the nerve-muscle joints increases, and the muscles are prone to not getting the instruction to relax after contraction, resulting in the contraction to continue to enhance, and cramps occur. 4. Epilepsy: Epilepsy is a chronic brain disease caused by infections, tumors and other reasons, which is mainly manifested by abnormal nerve discharges, resulting in muscle spasms and cramps. 5. Tetanus: Tetanus is a form of toxemia caused by Clostridium tetani, the toxin produced by the bacteria enters the bloodstream and reaches the muscles where it triggers muscle spasms. To reduce the occurrence of foot cramps, you can pay attention to calcium supplementation; easy to cramp at night when sleeping, before going to bed in the easy to cramp parts of the stretching exercise; pay attention to the calves of the warmth. If you still have frequent cramps that are difficult to relieve, it is recommended that you go to a regular hospital to clarify the cause of the problem.