A period that has not left after 9 days is usually a prolonged period, and the causes include endometrial disease, uterine fibroids, endocrine disorders, and abnormal coagulation function. The menstrual period is usually 3-7 days, more than 7 days is called prolonged menstruation, some women usually menstruation period is more than 7 days, is also normal, if it is suddenly or gradually appear longer than usual, also known as prolonged menstruation. It is recommended to consult a doctor in time. 1. Endometrial diseases: endometrial polyps, endometrial hyperplasia, malignant tumors, etc. will be manifested as irregular vaginal bleeding, or dribbling, need to consult a doctor in time for endometrial tissue biopsy, clear diagnosis and then symptomatic treatment. 2. Uterine fibroids: cause the area of uterine cavity to expand and contract abnormally, which may lead to excessive menstruation. 3. Endocrine disorders: Ovarian hypoplasia leads to a decrease in the level of estrogen secretion, and the endometrium cannot be repaired in time after shedding. Luteal atrophy can lead to irregular peeling of the endometrium and prolonged menstruation. It is necessary to take estrogen and progesterone drugs to adjust the menstrual cycle, including estradiol valerate and dydrogesterone. 4. Abnormal coagulation function: blood disease, aplastic anemia, etc., will lead to coagulation dysfunction, prolonged menstrual period, menstrual bleeding does not stop. In addition, if an intrauterine device (IUD) is placed, trauma to the lining of the uterus caused by the IUD being placed for too long, or downward displacement can also lead to vaginal bleeding. If abnormal menstruation occurs, including abnormal menstrual flow and menstrual period time, it is recommended to seek timely medical treatment under the guidance of the doctor, so as to avoid delaying the condition, and do not blindly use medication on their own, so as not to aggravate the condition, or lead to adverse reactions.