Endometrial polyps are generally located in the uterine cavity. Some endometrial polyps may be expelled during menstruation, as each menstrual period involves the shedding of the endometrial lining, causing some small polyps to disappear after menstruation. However, if the endometrial polyps persist and are relatively large, causing irregular bleeding, excessive menstrual flow, or affecting pregnancy, it might be necessary to perform a hysteroscopy for examination and treatment, and to send samples for pathological testing.