If menstruation lasts more than half a month with lower abdominal pain: 1. It may be caused by endometrial inflammation, pelvic inflammatory disease or endometriosis, and it is recommended that the corresponding diagnosis be given together with the medical history. 2. It may be a lesion of the endometrium, such as endometrial cancer, atypical hyperplasia of the endometrium, or simple hyperplastic overgrowth of the endometrium, etc., which may lead to dripping menstruation. 3. 4.It may be caused by submucosal fibroids or large fibroids between the muscle walls.