The appearance of black blood clots in women’s menstrual blood, as long as the amount of menstrual flow is within the normal range, Western medicine is considered to be a normal physiological manifestation, can not do any treatment treatment. It is mostly due to the fact that after the menstrual blood is discharged from the cervix, it flows into the vagina and does not flow out of the vaginal opening immediately, and then coagulates into clots and is oxidized inside the vagina, which turns it into black blood clots. As a small amount of black blood clots will not have any adverse effect on the body of a woman, it does not need to be examined and treated. Black blood clots are formed by the coagulation of menstrual blood and endothelial tissues. If a woman has severe menstrual cramps and obvious black blood clots at the same time, traditional Chinese medicine believes that it belongs to the phenomenon of blood stasis, which may be caused by qi stagnation and blood stagnation, or it may also be caused by cold stagnation and blood stagnation and is usually advised to take traditional Chinese medicines to regulate it by moving qi, activating blood and relieving pain.