Under normal circumstances, a woman’s menstrual period will be completely cleared in 3-7 days, and if it takes longer than 9 days, it is an abnormal phenomenon. If the menstruation is not clean after 1 month, it is often caused by the lesions of the endometrium itself, such as atypical hyperplasia of the endometrium, endometrial polyps, inflammation of the endometrium, submucosal fibroids of the uterus, or cancers of the endometrium, which can cause irregular menstruation in the clinic. It is recommended to do ultrasound examination and gynecological examination to find out whether there is any abnormality in the vulva, vagina and cervix. And through ultrasound examination to know whether there are tumors in the uterus itself, whether there are tumors in the pelvis, and to know the condition of the endometrium. If the endometrium has uneven echogenicity and thickening in this case, it is recommended to do diagnostic scraping to exclude the possibility of endometrial pathology.