Prolonging the menstrual period is not beneficial to women; on the contrary, it may cause anemia, infection, abnormal ovulation and other related diseases. In general, the duration of normal menstrual period is around 5-7 days. The bleeding volume of each menstrual period is mostly 20-60ml, and more than 80ml is considered excessive menstruation. If the menstrual period is prolonged, then the amount of bleeding will increase accordingly, which may cause anemia in the long run. During menstruation, the cervical opening is slightly open, and prolonged menstruation will increase the chance of infection of the endometrium as well as the adnexa. In addition, prolonged periods may cause disruption of the menstrual cycle, which may affect the timing of ovulation. Occasional prolonged periods have no significant adverse effects. If it persists for a long time, it is necessary to go to the hospital to clarify the cause of the disease and then actively treat the symptoms to avoid delaying the disease.