Tummy pain with menstruation after endometriosis surgery is usually abnormal and is usually related to inflammatory infection, disease recurrence and malignant changes. 1. Inflammatory infection: If inflammatory infection occurs after endometriosis surgery, it will also trigger the symptom of stomach pain to a certain extent. The severity of stomach pain depends on the degree of inflammatory infection. 2. Disease recurrence: If the endometriosis surgery performed by the patient is not a radical surgery, there will be a great degree of recurrence, and the phenomenon of stomach pain after menstruation may occur. 3. Malignant changes: due to endometriosis there is a certain possibility of malignant changes, but most of the chances are reduced. If localized malignant changes occur, the phenomenon of postoperative menstrual pain may also occur. Therefore, it is recommended to go to the hospital in time for examination of menstrual pain after endometriosis surgery, to clarify the cause of the disease, and then follow the doctor’s instructions to deal with the treatment.