Increased leucorrhea just after menstruation is mainly due to vaginitis caused by dysbiosis of the vaginal flora. Menstruation in women is a retreating bleeding of the endometrium caused by a simultaneous decrease in estrogen and progesterone levels. When the hormone level decreases, the defense ability of the reproductive system also decreases. Different types of vaginal inflammation occur when the self-purification ability of the vagina decreases, glycogen decreases, the level of the dominant bacteria Lactobacillus decreases, and other pathogenic bacteria multiply. The level of sex hormones also rises slowly after the end of menstruation, and the immediate end of menstruation is still a good stage for vaginitis. Many women have recurrent vaginal inflammation before and after menstruation or even during menstruation. Preventive use of vaginal inflammatory lotions and medications for 3-5 days before and after menstruation for more than 3 months can effectively prevent recurrence of vaginal inflammation.