The pain in the abdomen may be due to menstruation, as the pelvic cavity is congested before menstruation, which can lead to discomfort or swelling in the abdomen, but the symptoms are relatively mild and most of them can improve after rest. In addition, if there is pain in the abdomen, it may be caused by other causes, such as pelvic inflammatory disease, endometriosis, pelvic tumors and uterine fibroids, which may cause pain in the abdomen. Pregnancy with pre-eclampsia can also cause pain in the abdomen and corresponding medical conditions, such as digestive system disease enteritis or urinary system disease kidney stones, bladder inflammation, etc., may cause pain in the abdomen. It is recommended to analyze the clinical history and the time of the last menstrual period to understand the cause of the disease and then decide whether treatment is needed.