The more common reason for the menstruation to be unclean is the poor contraction of the uterus, which makes the endometrium shed incompletely and leads to the prolongation of the menstruation, at this time, you can add the medicine to strengthen the contraction to reduce the amount of menstruation. The problem can be solved if the menstrual flow is slowly reduced and the bleeding is stopped after the medication is administered. However, if the menstrual flow continues after the medication is administered, it is necessary to consult a doctor as soon as possible. There are many reasons for irregular menstruation. The more common causes may be abnormal pregnancy or pelvic tumors, or lesions in the endometrium, such as polyps or submucosal fibroids in the uterine cavity. All of these can lead to irregular periods and prolonged menstruation, so the only way to deal with them is to find the real cause.