If a woman has blood on the tenth day of menstruation, it is often considered to be the result of prolonged menstruation, which may be caused by adenomyosis or fibroids, as well as endometrial polyps, which may cause prolonged menstruation, and for women who have an intrauterine device (IUD), it may also be caused by an IUD. For women who have a particularly low menstrual flow and persistently do not clean, it may be caused by ovarian endocrine disorders that lead to the absence of ovulation, thus causing the phenomenon of anovulatory uterine bleeding, so when women have blood on the tenth day of menstruation, they may need to go to the hospital gynecological examination ultrasound, or even sex hormone six to determine the specific cause.