More than 90% of menstrual cramps are primary, which are mainly associated with increased prostaglandin levels in the endometrium during menstruation. Prostaglandins amplify pain, cause excessive contraction of the smooth muscle of the uterus, vascular contracture, and cause ischemia and hypoxia in the uterus. There is no cure for primary dysmenorrhea. In addition to the universal principles of adjusting your attitude and taking care of your work and rest, all you can do is to stop the pain. You can consider consulting your doctor to use painkillers such as ibuprofen or oral short-acting contraceptives, which can effectively relieve the symptoms. However, if the pain is very intense and even incapacitating, it may be secondary, meaning that the pain is caused by other organic lesions, commonly endometriosis and myometriosis. If you feel abnormally strong pain, you should go to the obstetrics and gynecology department for examination as soon as possible. Treatment is also not simply to stop the pain, but to treat the primary cause.