It is normal to have a period within 3-7 days. It is not normal to have a period longer than 7 days and the blood is still not clear. Menstrual period more than 7 days, the blood is still dripping, you must go to the hospital to do the appropriate examination to see what causes. First, the period is not clean for more than 7 days, most of them have endothelial polyps, there will be 8-10 days before the menstruation can be clean. 20 days or so to have a period, you must go to the hospital to do ultrasound to see if there are endothelial polyps, if there are endothelial polyps, you must do endothelial polyp removal to be able to relieve. Second, submucosal fibroids can also cause menstrual dragging. You can have surgery for submucosal fibroids and then treat the symptoms. Third, in the late menstrual period, brown discharge also cannot exclude endocrine disorder. So a lot of brown discharge in the late menstrual period, you must go to the hospital for anti-inflammatory examination to see what causes it. Problems with the cervix, polyps, cervical erosion or precancerous lesions of the cervix can cause trailing at the end of menstruation.