The presence of brown discharge before the onset of menstruation in female patients means that menstruation is imminent. Since there is a significant drop in sex hormones in women’s bodies during menstruation, the process of hormonal decline can have a certain impact on the endometrium, and some patients can appear to have a small amount of vaginal bleeding before the onset of menstruation. When mixed with vaginal discharge, the blood is decomposed by the bacteria in the vaginal discharge, and then there will be brown discharge, which is a normal physiological phenomenon and does not require special treatment. It is recommended to keep the genital area clean and hygienic, change underwear, sanitary napkins and other sanitary products regularly, and to avoid eating too cold food and eat warm food.