The black blood on the first day of menstruation is generally a normal phenomenon, because the first day of menstruation is less menstrual volume, can not be discharged in a timely manner, will remain in the reproductive tract, it will occur the color deepening change. If it is not accompanied by abdominal pain, odor, vulvar itching, yellowing of the leucorrhea and other abnormalities can not be treated, and generally will not affect health. However, if the entire period of menstrual blood appears black, indicating the existence of qi stagnation and blood stasis, may be due to the usual cold, stress, emotional instability, irregular life and other reasons. The black menstrual blood should be adjusted to a good routine and diet, to ensure good sleep and adequate nutrition, and to eat less cold, stimulating food.