Black blood at the beginning of menstruation is a normal phenomenon. The amount of menstruation at the beginning of menstruation is very small and the color is black due to the acidic environment when passing through the vagina. If the uterus cold will cause black menstruation, and gynecological inflammation, qi and blood deficiency, qi stagnation and blood stasis can cause black menstruation, endocrine disorders can also cause menstrual disorders, menstrual color changes, menstrual blood black need to go to the hospital for examination, can B ultrasound, gynecological examination to exclude gynecological inflammation, need to see a traditional Chinese medicine, the uterus cold need to take warming pills, pay attention to abdominal warmth, qi and blood deficiency is best to take supplement qi, blood, It is best to take Chinese herbal medicine to tonify Qi and Blood and strengthen nutrition. If the Qi stagnation and blood stasis is better to take Wuji Baifeng Pill, do not be anxious and angry during the period, and do not eat cold food, which can improve the situation of black menstruation.