Common causes of dysmenorrhea without blood include adhesions in the uterine cavity or cervix, early pregnancy, gynecological disorders, and other disorders that can cause pain in the lower abdomen such as enteritis. It may also be a normal physiological process. 1. Uterine cavity or cervical adhesion: painful menstruation without blood most need to be alert to the uterine cavity or cervical adhesion caused by, especially patients with a history of abortion. 2. Early pregnancy: Lower abdominal discomfort can occur in the early stages of pregnancy, similar to dysmenorrhea, and should be identified. 3. Gynecological diseases: pelvic inflammatory disease, endometriosis, ovarian cysts, etc. can also cause lower abdominal pain, which should be identified. 4. Other causes: Acute enteritis and other digestive diseases, cystitis and other urinary diseases can also cause pain in the lower abdomen. 5. Normal physiological conditions: some women may experience lower abdominal pain before menstruation, which may be related to hormonal fluctuations and other factors. In addition, dysmenorrhea without blood may also be caused by congenital malformations of the reproductive tract, such as hymenal atresia. If there is any discomfort, it is recommended to consult a doctor in time for diagnosis and treatment.