If the color is dark on the first day of menstruation, it is mostly related to the poor flow of menstrual blood. The reason why menstrual blood does not flow well is mainly related to the position of the uterus. When the uterus is in an anteriorly inclined anterior flexion position or a posteriorly inclined posterior flexion position, the menstrual blood can’t be discharged out of the uterine cavity in time, it will be stagnant inside the uterine cavity, and then when eliminated it will turn into stale bleeding, and the color will be dark. If the uterus is in posterior tilt and retroflexion position, it is recommended to rest on the bed during menstruation to reduce the angle between the uterine body and the cervix, which will make the menstrual blood flow smoothly and reduce the symptoms of dark-colored menstruation. If you have an anteriorly inclined anteriorly flexed uterus, you can lie flat on your back and gently press your hand above the pubic symphysis, which will also improve your symptoms. Whether you have an anteriorly inclined anteriorly flexed uterus or a posteriorly inclined posteriorly flexed uterus, drinking a bowl of hot brown sugar water every day during your menstrual period will also help your menstrual blood flow more smoothly and improve the symptoms of dark-colored menstruation.