In the clinic can cause a lot of reasons for calf cramps, patients of different ages lead to calf cramps for different reasons, common reasons are as follows: 1, long exercise time, exercise, sweat, and no timely supplementation of saline, the body’s fluid and electrolytes a large number of loss, the accumulation of metabolic wastes, the muscles of the local blood circulation is not good, easy to occur in the calf cramps, such as in the winter in the cold environment before the workout Inadequate preparation, summer swimming water temperature is low, easy to form calf cramps; 2, strenuous exercise when the whole body is in a tense state, the calf muscle contraction is too fast, the relaxation time is too short, the local metabolite lactic acid accumulation, muscle contraction and relaxation is difficult to mediate, thus causing calf cramps; 3, elderly patients and developing adolescents, if there is a cramp, can not be ruled out due to a lack of calcium, through the The symptoms will be relieved by calcium supplementation and eating foods with high calcium content.