It is not normal for your period to always be 7 to 10 days early. A normal woman should have her period about once a month. Early menstruation is likely to be related to the following factors. 1. Decline in ovarian function: it may cause shortening of menstrual cycle, which is manifested by having menstruation about 10 days earlier;. 2. Certain organic diseases, such as endometrial cancer, endometrial polyps, fibroids, etc., may also cause menstruation about 10 days early. The menstrual cycle of a normal woman is very regular, and it is usually rare to have disorders. Prolonged or shortened periods are usually caused by disturbances in the hormone levels in the body, perhaps due to external factors. Therefore, women with persistent irregular menstruation can go to the hospital to check the sex hormone six, assess the ovarian function, and also need gynecological ultrasound, etc., in order to exclude organic diseases. Menstruation 7 to 10 days in advance is definitely not normal, need to go to the hospital in time, the professional doctor to give relevant examination, clear diagnosis, for the cause of the treatment.