The normal duration of menstruation is 2-8 days, and the average is 4-6 days. If your period is prolonged, you need to consider several factors.1. Prolonged period caused by mental or environmental factors, bleeding is not necessary to treat if it is not heavy. Usually pay attention to rest, improve living habits, do not stay up late, strengthen nutrition, do not have too much emotional fluctuations, avoid anger.2, some organic lesions of the uterus caused by, such as endometrial polyps, cervical polyps, submucosal leiomyoma and so on this situation caused by the bleeding. Some of this bleeding is less bleeding, but some bleeding is always more, in this case you can do ultrasound and gynecological examination to identify, if necessary, need to do hysteroscopy. 3, endocrine disorders caused by prolonged menstruation, this time you need to go to check the hormone six to see the hormone levels are not abnormal.