Black blood flow during non-menstrual periods is due to a lack of qi and blood, including a black-brown discharge due to a slow shedding of the endometrium, which causes the iron in the blood to combine with the oxygen in the air. In this case, it is recommended to go to the gynecology department for a gynecological ultrasound to rule out any endometrial problems. This is because when there are polyps in the endometrium, including polyps in the cervical canal or uterine fibroids, the above situation may exist; also if intercourse or endocrine hormone abnormalities may cause this situation to occur. Depending on the situation, oral medications such as anti-inflammatory drugs or hemostatic drugs can be taken to help the disease improve quickly; meanwhile, if necessary, human papillomavirus infection or precancerous lesions should be ruled out because bleeding may occur when these factors occur.