If black blood appears on the first day of menstruation, it is mostly caused by Qi stagnation and blood stasis. It has a certain relationship with women’s usual growth environment and emotions, especially for some women who are overworked and mentally stressed, they are more likely to have black menstrual blood, and can be regulated with Wuji Baifeng Pill and Yimu Cao granules under the guidance of a doctor. Normally, menstrual blood is black and dark in color and is slightly sticky, without clots, but small and thin fragments can appear. You should pay attention to the amount of menstrual bleeding, the color of menstruation, and the duration of menstruation during menstruation. If you have irregular menstruation, you can go to the hospital for a gynecological examination in time to exclude disease problems.