There are not many cases of menstrual discharge of black and black things: 1. It may be that when a woman’s menstruation first comes, the endometrium is stripped and stays in the uterine cavity for a long time, or there will be black things when there is stagnation and blood stasis and poor flow of menstrual blood. 2. It may be due to the presence of submucosa in the uterine cavity of a woman. Uterine fibroids are ischemic and necrotic, which can also lead to the appearance of dark tissue in the discharged menstrual blood. 3. When women have hormone level disorders, they will also show black color. When there are more black things, you need to go to the hospital for gynecological ultrasound and gynecological examination. If there are many such things in the uterine cavity, you need to give timely treatment to clear the uterus and send pathological tests to clarify the cause for symptomatic treatment.