If the color of the first day of menstruation is black, it is mainly related to the following factors: First, because excessive dieting leads to a decrease in body resistance, which will have an impact on health, and will also have an impact on menstruation, so it will make the color of menstruation occur. Second, if the color of menstruation is black, and accompanied by impatience, anxiety and other corresponding emotional changes, it may also be caused by liver qi stagnation, it is recommended to take prozac to give regulation. Third, if you often eat cold food, often drink frozen drinks, may also lead to deepening the color of menstruation. Fourth, certain gynecological diseases, such as inflammation of the endometrium, pelvic inflammatory disease, often accompanied by dysmenorrhea symptoms. So for the first day of menstruation black color, go to the hospital to give a checkup, and then give the corresponding regulation.