Menstruation came 8 days still did not have clean be how

Normal menstrual period does not exceed 7 days, if the menstrual period lasts for 8 days is still not clean, called menstrual prolongation. For the cause of menstrual prolongation, the first is uterine fibroids, especially submucosal uterine fibroids or uterine fibroids between the muscle walls, resulting in increased endometrial area, may lead to menstrual prolongation. It is also possible that adenomyosis, adenomyosis patients overall increase in the uterus, but also increase the endometrial area, and affect the uterine contraction during menstruation, resulting in prolonged menstruation. There may also be endometrial diseases, such as endometrial polyps, endometrial cancer, etc., may lead to prolonged menstruation.