The symptoms of abdominal pain when it is time to have a period may be due to: 1. endometrial inflammation or cervical canal inflammation, causing cervical canal adhesions or uterine cavity adhesions; 2. symptoms of preterm abortion caused by pregnancy; 3. abdominal pain aggravated by pelvic inflammatory disease. In this case, it is recommended to go to the hospital in time for examination. Perform ultrasound examination to understand the condition of the uterus, the thickness of the endometrium and the presence of blood in the uterine cavity. A gynecological examination should be performed to find out if there are any cervical canal adhesions. If there are cervical canal adhesions, a probe or dilation rod can be performed to separate the adhesions in time, which may result in the timely discharge of blood from the uterine cavity. Perform blood HCG test to rule out pregnancy. If it is not caused by pregnancy, you can also give herbs to remove blood stasis, such as motherwort, which can activate blood circulation and remove blood stasis to promote menstruation.