Dysmenorrhea is sometimes a manifestation of many more serious diseases. First, cervical canal stenosis, women cervical canal stenosis will lead to menstrual blood outflow is not smooth and produce pain, that is, dysmenorrhea. Dysplasia of the uterus, dysplasia of the uterus will lead to abnormal blood supply, resulting in lack of blood and oxygen in the uterus and cause uterine muscle spasms and contractions, thus leading to dysmenorrhea. Third, gynecological diseases, such as endometriosis, pelvic inflammatory disease, etc., will affect the menstrual blood outflow is not smooth and lead to dysmenorrhea. Fourth, contraceptive devices, if the presence of contraceptive devices in the body, especially intrauterine devices, often make the degree of dysmenorrhea worse. Fifth, too much pressure, the spirit is in a state of excessive tension, more sensitive to pain. Sixth, irregular work and rest, irregular work and rest, easy to cause endocrine disorders, often manifested in irregular menstruation and dysmenorrhea.