Constipation may be caused by physiological reasons such as insufficient water intake, dietary habits and pathological reasons such as chronic enteritis and intestinal tumors. 1. Physiological reasons: daily exercise, exercise is very large, but the amount of water is not enough, the body lack of water is serious, resulting in dry stools, thus appearing constipation. At the same time, during the exercise period, the diet is not correct, green vegetables, apples and other vegetables and fruits eat less, sweet potatoes and other foods rich in dietary fiber intake is insufficient, constipation will occur. 2. Pathological reasons: chronic enteritis, intestinal tumors and other intestinal diseases can cause intestinal dysfunction, intestinal peristalsis is too slow, will lead to constipation. There may be other reasons for constipation instead of exercising every day, so it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.