If the menstrual blood is completely black, slag-like discharge, and no bloody discharge can be seen clinically, it is often due to inflammation of the pelvis. Careful observation in daily life will reveal pain in the lower abdomen, which is aggravated especially during menstruation, and also during sexual intercourse, and is a distention of the lower abdomen, and the pain will be aggravated after exertion. It is best to have a gynecological examination to find out if there is pressure pain in the uterine adnexa. If there is inflammation, give anti-inflammatory treatment. If there is no blood in the whole process of menstruation, but all black slag-like discharge, it is recommended to understand the situation of the endometrium through ultrasound examination, and if there is inflammation, give anti-inflammatory treatment by intrauterine injection, and it is recommended to take oral motherwort capsule to regulate menstruation.