Premature menstruation for 10 days is clinically common due to the following reasons: First, it is caused by endocrine disorders, which can be caused by chronic stress, anxiety or environmental changes, making menstruation appear early. Second, taking certain medications in daily life, such as progesterone, can cause early menstruation. The third, oral emergency contraceptive pills can also cause withdrawal bleeding. Fourthly, lesions of the endometrium, such as endometritis, endometrial polyps or endometrial cancer, may cause early menstruation. In addition, submucosal fibroids can also cause early menstruation. Therefore, when early menstruation occurs, it is important to find out the cause and give targeted treatment according to the cause.