The vast majority of women’s menstrual periods take 3-7 days to clear. If your period was clean in 5 days in the past, and it is not completely clean in 7-8 days this month, it may be caused by the following reasons: 1. relatively fatigue during the menstrual period, without proper rest, so it causes the situation of prolonged menstruation. 2. insufficient estrogen in the body, so it causes the period to be not clean in 7-8 days, mainly because the endometrium is not able to repair completely, so it is not 3. Because the endometrium has polyps or inflammation, it will lead to prolonged menstruation. In addition, if it is a submucosal fibroid, it will also prolong the menstrual time, so for this case or give careful consideration, it is advisable to do an ultrasound examination to understand the situation of the uterus, understand the endometrial situation, and then clinical then give the appropriate treatment.