Under normal circumstances, the color of menstruation is dark red without blood clots. If the color of menstruation is dark brown, it is often caused by the following clinical reasons: 1. if there is inflammation in the endometrium, the color of menstruation becomes darker, often accompanied by pain in the lower abdomen or dysmenorrhea during menstruation; 2. due to abnormal position of the uterus, such as the uterus in forward-flexion or back-flexion position, so that menstrual blood cannot flow out of the vagina as soon as possible. The menstrual blood does not flow out of the vagina as soon as possible, but accumulates in the uterine cavity, so that the bleeding becomes old when it flows out, so the color becomes brown. This condition may also be associated with dysmenorrhea, which can be diagnosed through gynecological examination. It is advisable to drink hot brown sugar water after menstruation, one bowl a day, until the menstruation clears. And if there is inflammation, actively give anti-inflammatory treatment.