Women with black blood clots during the onset of menstruation may have the following conditions: i. It may be due to the accelerated pelvic blood circulation in women, the endometrium shed in the uterine cavity stays in the uterine cavity for a longer period of time and is not discharged in time will lead to the formation of black blood clots. Secondly, it may be related to women’s overwork, cold, emotional depression during menstruation. Women who have black blood clots during menstruation should pay attention to proper rest, give warmth treatment, and can give oral brown sugar water or Blood Mansions and Stasis Capsules, motherwort granules and other blood-stasis activating drugs to help the accumulated blood in the uterine cavity to be discharged smoothly will have black blood clots into dark red blood. It is not normal for women to have black blood clots during menstruation and they need to be treated promptly to avoid menstrual disorders.