Most bacterial vaginitis has no significant effect on menstruation.

Because when women have bacterial vaginitis, it does not affect the ovarian secretion of estrogen, so it does not affect menstruation. Sometimes women develop bacterial vaginitis before menstruation and choose vaginal medication. Because the endometrial lining is relatively thick and menstruation is approaching, local medication may cause irritation, leading to the shedding of the endometrium. This is caused by local medication stimulation, not by affecting women's menstruation.

Most cases of bacterial vaginitis are likely to recur after menstruation is over, so it is recommended that women undergo consolidation treatment for bacterial vaginitis after their periods are clean. In some women with bacterial vaginitis, particularly those with poor immunity, it might lead to acute cervicitis, and potentially further develop into endometritis. These conditions may cause women to experience prolonged menstrual bleeding, although this is relatively rare.