Early menstruation for 8 days is clinically common due to the following reasons: First, early menstruation due to progesterone deficiency caused by endocrine disorders. Second, the menstrual cycle is shortened due to submucosal fibroids or large intermyometrial fibroids, which can manifest clinically as heavy and dripping menstruation. Third, endometriosis can also lead to early menstruation. Fourth, clinically, taking certain drugs may also lead to early menstruation, such as emergency contraceptives, progesterone, short-acting contraceptives may lead to early menstruation. If you take too much blood-boosting drugs in the clinic, it will also lead to early menstruation. There are still many reasons for early menstruation. It is recommended to combine the clinical history and do the corresponding examination, and then give treatment according to the results.