If the color of menstruation is dark at the beginning, it indicates that the menstrual blood is stagnant in the uterine cavity and does not flow out smoothly, so that the menstrual blood gathers in the uterine cavity and turns into stale bleeding and dark color. It is recommended to boil brown sugar and ginger water and drink it while it is hot during menstruation, not only to replenish the blood, but also to drive away the cold and warm the uterus, which will make the menstrual blood flow out more smoothly, and then the color of menstruation will be changed. In addition, if the color of menstrual blood is dark, you should also exclude the possibility of endometrial inflammation. If necessary, a diagnostic curettage can be performed in the first 6-12 hours of menstruation in order to rule out endometrial inflammation and treatment can be given according to the results.