A low black menstrual flow may be due to a deficiency of qi and blood, qi stagnation and blood stasis, or poor menstrual flow, which may cause dysmenorrhea, cervicitis, headaches, acne, and other conditions. A normal menstrual flow is between thirty and sixty milliliters. If the amount of menstruation is less than twenty milliliters each time, it is considered as too little menstruation, which may be caused by low sex hormone, anemia and other conditions. If your menstrual flow is too small and dark, you should go to the hospital for examination. You can take some medicines to activate blood circulation and remove blood stasis, dredge the liver and regulate qi for treatment, and pay attention to rest and warmth during menstruation. You can use ginger, brown sugar boiled water to drink, eat less stimulating food and ice things, pay attention to maintain a happy mood, pay attention to perineal hygiene.