Usually, the normal menstrual period is 3-7 days. If it is longer than 7 days, it is a prolonged period, which may be related to endocrine disorders, medications and certain diseases. If the prolonged period is due to the above mentioned reasons, it can be restored to normal by stopping the medication. If the drug factor is excluded, it is necessary to consider whether it is an organic lesion, such as cervical lesion, uterine tumor and ovarian tumor. Patients are advised to seek medical attention and have gynecological examinations, ultrasound, etc. to confirm the diagnosis. If the cervix, uterus and ovaries are normal, you need to consider that it may be due to female endocrine disorder with abnormal hormone secretion. The most common type is dysfunctional uterine bleeding, such as luteal atrophy, and the patient needs symptomatic menstrual regulation treatment. In conclusion, once the patient encounters the problem of prolonged menstruation, it is recommended to seek medical attention in a timely manner to clarify the cause and provide targeted treatment to prevent delaying the condition.