Black discharge suggests that there is blood in the leukorrhea. Leukorrhea that is thin, clear, odorless and in small amounts is normal. If there is black discharge in the leukorrhea, it suggests that there is blood in the leukorrhea, and the blood stays in the vagina for a long time, and the amount of blood is small, so the leukorrhea will be black. If the black discharge appears during intercourse, it suggests that the cervix has erosion, polyps, cervical cancer and precancerous lesions. If the black discharge occurs during ovulation, when estrogen levels are low, there will be a transient black coloration of the leukorrhea. At this time, the amount is generally small, 2-3 days to go back to the problem, occasionally 1 or 2 times ovulation bleeding does not indicate a problem. Frequent bleeding during ovulation indicates endocrine disorders, and you must go to the hospital for relevant examinations and then treat the symptoms. If the black discharge appears in the luteal phase, it means that the luteal body is not functioning well, so you can take oral dextroprogesterone or progesterone capsules to treat the symptoms.