The causes of dysmenorrhea include physiological factors, mental factors, physical factors and disease factors. 1. Physiological factors: the endometrial prostaglandin content increases during menstruation, and the high prostaglandin content can cause excessive contraction of uterine smooth muscle and vascular contracture, resulting in uterine ischemia and lack of oxygen and dysmenorrhea. 2. Mental factors: During menstruation, women’s mental factors such as fear, depression, anxiety, excessive stress, etc., are related to dysmenorrhea. 3. Physical factors: some patients are also prone to dysmenorrhea due to physical factors such as physical weakness and oversensitivity to internal and external stimuli. 4. Disease factors: Certain diseases such as endometriosis, pelvic infection, cervical adhesion, etc. can also cause dysmenorrhea due to inflammatory stimulation and hyperplasia. Dysmenorrhea may also be related to other causes, it is recommended that patients go to the hospital in time, to clarify the cause of the disease and follow the doctor’s instructions for treatment.