Black vaginal blood that is not menstrual may be due to menstrual disorders, or it may be due to ovulatory bleeding, pre-miscarriage, cervical lesions or endometrial lesions. 1. Ovulation bleeding: not monthly menstrual flow of black blood, may be a small amount of bleeding phenomenon in women during ovulation. 2. Menstrual disorders: vaginal bleeding that is black in color when a woman is not menstruating may be a manifestation of menstrual disorders, in addition to which, a woman may have symptoms such as irregular menstruation, increased menstrual flow or prolonged menstrual period. 3. Pre-eclampsia: If a woman of childbearing age who has had sexual intercourse experiences vaginal bleeding during non-menstrual periods, it may be a sign of pre-eclampsia. 4. Cervical lesions: women who have vaginal bleeding may have cervical lesions, such as cervical polyps and cervical cancer, which may cause contact vaginal bleeding after vaginal operation or coitus. 5. Endometrial lesions: endometrial diseases such as endometritis, endometrial polyps or endometrial cancer can also lead to irregular vaginal bleeding. If the blood is not discharged in time and oxidized in the vagina, it appears black. There are other possible causes for women to experience non-menstrual vaginal bleeding. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.