There are many reasons for black menstrual blood. If menstruation is accompanied by abdominal pain, it is possible that the black menstrual blood is caused by not paying attention to warmth during menstruation, eating cold, sexually cold food or having cold in the uterus or body cold. If there are uterine adhesions or cervical canal adhesions, it may also lead to dark menstrual blood. If you are overworked, nervous, or have mood swings during menstruation, it may cause the dark color of menstrual blood. It is generally recommended to pay more attention to rest, keep warm, and drink brown sugar and ginger water in moderation to promote blood circulation. If there is endometrial lesion or submucosal fibroid, it may lead to excessive menstrual flow or even abnormal black menstruation. It is recommended to go to the hospital for ultrasound examination, internal gynecological examination and routine blood tests as soon as possible after menstruation clears. Menstrual blood may also be black if there are blood disorders such as anemia or abnormal blood clotting.