Having a period for 1 month is abnormal, that is, abnormal uterine bleeding. Normally, menstruation will be clean within 7 days. If it is not clean for more than 7 days, the most common reason is endocrine disorder, that is, abnormal ovulation, as well as uterine fibroids, endometriosis, adenomyosis, endometrial lesions, endometrial cancer, hormone-secreting ovarian tumors, all of which may cause irregular vaginal bleeding. Therefore, in this case, it is important to go to the hospital for ultrasound examination as soon as possible. Vaginal examination should also be done. Sometimes cervical polyps, cervical precancerous lesions or cervical cancer may also occur, which must be examined as soon as possible, and treatment should be carried out according to the examination results.