The main reasons for abdominal pain after running are: 1, strenuous exercise after a full stomach, because the blood supply of the stomach is mainly used to digest food, strenuous exercise is likely to lead to stomach or intestinal spasm, resulting in abdominal pain. 2, is caused by irregular contraction of the uterus abdominal pain, so especially during menstruation can not be strenuous exercise, because at this time the endometrium is in the shedding state, excessive exercise will aggravate the uterine contraction caused by dysmenorrhea. 3, the usual exercise is too little, and then suddenly excessive, too long exercise, so that the abdominal muscle spasm or acidic metabolites accumulate in the body, this situation can be taken to massage or hot compresses to relieve the way. Finally, it should be noted that if the abdominal pain symptoms are not relieved by rest, it may be caused by inflammation of the uterine adnexa, and it is necessary to go to the hospital for examination and diagnosis.