In women of childbearing age, if there is black blood when they first have their menstrual period or when their menstrual period is about to be cleared, most of the time the endothelium is peeled off less and stays in the uterine cavity for a longer period of time, which results in slower blood circulation. The reasons for heavy bleeding in the middle of menstruation include: first, it is related to the coldness of the uterus; second, it may be caused by necrotic tissues in the uterine cavity, such as necrosis of submucosal fibroids, ischemia and necrosis of uterine polyps, you can go to the hospital to do gynecological ultrasound examination, and give the medicines that activate blood circulation and remove blood stasis, such as Gui Zhi Poria Capsules, Motherwort Granules, in order to help the discharge of black blood as soon as possible, and if necessary, you need to do the treatment of scraping or hysteroscopic electrolysis. If necessary, it needs to be removed by curettage or hysteroscopic electrocautery to avoid causing infection in the uterine cavity and affecting the contraction of the uterus.