Dysmenorrhea, or painful periods, is one of the most common symptoms in gynecological patients. It can be divided into primary dysmenorrhea and secondary dysmenorrhea. Primary dysmenorrhea is cyclic menstrual pain without organic disease, while secondary dysmenorrhea is commonly associated with endometriosis, myomas, inflammatory pelvic disease, adenomyosis, endometrial polyps and menstrual outflow tract obstruction. Primary dysmenorrhea is most common in women in their 20s and 30s. The incidence of dysmenorrhea is still very high among the female students I teach, and I have conducted research studies for this purpose to find out the patterns and characteristics of dysmenorrhea. Primary dysmenorrhea starts more often right after the onset of menstruation than secondary dysmenorrhea. The characteristics of the pain are not different, and the pain is often colicky and accompanied by lower back pain, nausea, vomiting, headache or diarrhea. Primary dysmenorrhea occurs independently of age, race and socioeconomic status. The exact cause of dysmenorrhea is still unclear and no single theory can fully explain this syndrome. Different patients respond differently to treatment, and consideration of the etiology may be multifaceted. When the endometrium is shed at the onset of menstruation, the endometrial cells release prostaglandins. Prostaglandins stimulate contraction and ischemia of the uterine muscles. The more severe the dysmenorrhea, the higher the prostaglandin levels in the menstrual blood, peaking within the first two days of menstruation. Prostaglandin release is also seen in secondary dysmenorrhea, with levels varying according to the organic pelvic pathology. Since dysmenorrhea is associated with the ovulatory cycle, it does not usually occur at the onset of menstruation but in late adolescence.14C26% of adolescent women are unable to attend school or work due to dysmenorrhea. Typically, the pain occurs on the first day of menstruation, usually at the beginning of the period, but some people do not start the pain until the second day of menstruation. The pain is crampy and paroxysmal. In severe cases, the face is white, cold sweat, general weakness, and cold extremities. Nausea, vomiting, diarrhea and headache are also common. The most common clinical manifestations of dysmenorrhea from the TCM point of view are two: 1. cold dysmenorrhea: cold pain in the abdomen, warmth and pressure, warmth is reduced, accompanied by general weakness, nausea and vomiting, fear of cold; or a feeling of anal swelling, which is caused by the deficiency of the blood and loss of warmth in the liver meridian. 2. 2, is stasis of blood dysmenorrhea: abdominal pain is severe, persistent, without obvious cold sensation, when the stasis in the uterus discharged, the pain immediately alleviated. This is obstruction of blood stasis and pain if it does not pass. According to statistics, cold dysmenorrhea accounts for the majority of cases, so Chinese medicine treatment for dysmenorrhea should be based on warming the menstruation and dispersing cold. Prescriptions such as warming menstrual soup can be used.