If the abortion is followed by swelling and pain in the abdomen for a month, and if there is no menstruation at this time, it is likely that the cervical mucosa was damaged during the abortion procedure, causing adhesions in the cervix, so that the menstrual blood cannot flow out when the menstruation occurs, resulting in swelling and pain in the lower abdomen. It is recommended to go to the hospital for ultrasound examination as soon as possible to find out whether there is fluid in the uterine cavity. If there is fluid, it means that there is blood in the uterine cavity and it is recommended to do cervical dilatation as soon as possible so that menstrual blood can be discharged smoothly through cervical dilatation. Oral antibiotics can be taken appropriately after abortion to prevent inflammatory reaction of the mucosa and reduce the possibility of adhesions. In addition, if the pain in the abdomen occurs after menstruation, it may be caused by inflammation. A gynecological examination can make a preliminary diagnosis and then give anti-inflammatory treatment.