The presence of bacterial vaginitis is considered with yellowish discharge after menstruation. Bacterial vaginitis is one of the common vaginal inflammatory diseases in obstetrics and gynecology, due to dysbiosis. After menstruation, estrogen and progesterone levels are relatively low, and there are fewer dominant bacilli in the vagina, so the pH value in the vagina is elevated. The self-purification ability of the vagina itself is relatively poor, coupled with the invasion of exogenous pathogens, so it is easy to lead to bacterial vaginitis. The lack of dominant bacilli and the proliferation of anaerobic bacteria in the vagina, the main clinical manifestation is the increase of vaginal discharge, yellowing, and secretion stimulation can cause vulvar itching discomfort. Its treatment is mainly metronidazole treatment, you can consider oral medication. Generally, two tablets twice a day, two tablets once, after meals to reduce gastrointestinal stimulation. You can also consider using metronidazole suppositories inside and outside the vagina, and both treatments have similar effects.