Women’s menstrual period is usually 2-8 days, the average is 4-6 days, but due to individual differences, there are differences in the menstrual period, but menstruation comes for eight or nine days in most cases is not normal. There are many reasons for prolonged menstrual period, which may be caused by uterine fibroids, endometrial polyps, endocrine disorders and so on. It is recommended to consult a doctor in time to find out the cause and treat it under the doctor’s guidance. 1. Uterine fibroids: may be due to heredity, sex hormone levels, etc. Patients often have symptoms such as increased menstrual flow, prolonged duration of menstruation, increased leukorrhea, lower abdominal distension, pain, and so on. 2. Endometrial polyp: it may be caused by high estrogen level, long-term gynecological inflammation stimulation, etc. Patients may have prolonged menstruation, excessive menstruation, postmenopausal vaginal bleeding and other symptoms, patients can use medicines such as progesterone under the guidance of the doctor or undergo surgical treatment. 3. Endocrine disorders: If the patient’s mood swings are large, frequent late nights, overwork, etc., there may be endocrine disorders and disorders, thus affecting the menstrual period. There may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.