The first reason is that if a girl is older than nine years old, the discharge is less and creamy in color, without odor or with a faint fishy smell, most of these cases indicate that the endometrial glands secrete a lot before menstruation, leading to increased discharge. The second reason is due to inflammation of the vagina in young women, which can cause bacterial infection due to the lack of local care and diligent change of underwear, resulting in yellowish discharge, high volume and itching of the vulva, or odor of vaginal discharge. It is recommended to go to the hospital for routine laboratory tests of the leukorrhea and give medication according to the pathogenic bacteria infected.