If your menstruation is not clean, you may have the following problems. First, there are problems with the uterine lining, you should do gynecological ultrasound examination to see if there are uterine submucous fibroids, endometrial polyps, endometrial thickening, ovarian cysts and other related diseases, do gynecological ultrasound to line up. Second, endocrine disorders, do the six levels of female hormones to see if estrogen, progesterone, follicle-stimulating hormone, luteinizing hormone and other abnormal or abnormal ratio. Third, whether there is a problem with the cervix, should gynecological internal examination or colposcopy to see whether the cervix has erosion, cervical polyps, cervical chronic inflammation and so on.