Menstruation is about 10 days early, in which case it depends on the amount of vaginal bleeding. If the amount of blood is relatively small, it is more likely to consider ovulatory bleeding, and this would not be considered early menstruation. Ovulation bleeding is caused by insufficient support of hormone levels in the body, and occasionally occurs, usually the amount is particularly small, and lasts for 3-5 days does not require treatment, and will stop naturally. If the amount of blood is relatively large and reaches the amount of menstruation, this kind is considered early menstruation. The most likely cause of early menstruation is endocrine disorders, you can first check the gynecological ultrasound to see if there is any abnormality in the uterus, adnexa and endometrium. If there is no abnormality, you can check the level of six female hormones to see if there is any endocrine abnormality. Especially the ratio between follicle stimulating hormone and luteinizing hormone, if the ratio is more than 2, it is considered that there is something wrong with the ovarian function, so you can do artificial cycle to regulate menstruation or use Chinese medicine to regulate menstruation.