Menstrual cramps occur mainly as a result of excessive menstrual flow. The regulation of menstruation is mainly related to the level of hormones in the body. If excessive menstrual flow occurs: firstly, it should be ruled out whether it is caused by a disturbance in the level of hormones in the body, most often due to an increase in estrogen, which leads to an overgrowth of the endometrium. Secondly, the uterus may not recover well due to overexertion or staying up late during menstruation, and the uterus may not contract well due to eating too much cold food or being exposed to too much cold food during menstruation, resulting in increased bleeding. If menstrual bleeding occurs for several months in a row, it is necessary to consult a doctor promptly because excessive menstrual flow for a long time may lead to anemia and even life-threatening conditions.