The pain of having a period but the period has not come to consider the premenstrual syndrome, followed by pelvic inflammatory disease, ectopic pregnancy and other diseases may be caused. 1. Premenstrual syndrome: Premenstrual syndrome is a group of syndromes that occur during the luteal phase in women of gestational age. The cause of the syndrome is not yet clear, and may be related to ovarian hormone imbalance and psychosocial factors. Patients will have physical symptoms, mental symptoms and behavioral changes, physical symptoms are manifested in nipple swelling and pain, abdominal distension and pain. 2. Pelvic inflammatory disease: Pelvic inflammatory disease is a common infectious disease of the upper reproductive tract, patients will have lower abdominal pain, fever and other symptoms, the cause of the disease is related to pathogen infection. If you suffer from pelvic inflammatory disease, you will have pain during non-menstrual period when you have your period. 3. Ectopic pregnancy: Ectopic pregnancy refers to the development of fertilized egg in the uterine cavity outside the site of the bed, if the recent normal sexual life, menstrual delay, abdominal pain and other symptoms, need to be alert to the occurrence of ectopic pregnancy, the cause of the failure of contraception, fallopian tube inflammation and other factors related to. There are more reasons for the pain of coming to menstruation but menstruation has not come, it is recommended that the patient go to the hospital for relevant examination and clear diagnosis.