Running exercise is not recommended during menstruation. The endometrium is shedding during menstruation, so if you exercise strenuously, it may cause the endometrium to shed faster, causing heavy bleeding, which can seriously lead to hemorrhage. When strenuous exercise, it is possible to cause menstrual blood to retrograde into the fallopian tubes, ovaries and pelvis, leading to pelvic inflammatory disease. Active endometrium into the pelvis, ovaries, may lead to endometriosis and so on. During menstruation, it is necessary to pay attention to a healthy diet and nutrition, pay attention to keeping warm, keep the pubic area clean and hygienic, and avoid sexual intercourse and strenuous exercise. If there is any abnormality during menstruation, you need to go to the hospital in time, clarify the cause of the disease with the help of the doctor, and carry out targeted treatment or therapy.