Vaginitis during pregnancy should be actively treated, generally choosing vaginal medications. Vaginal medications typically do not enter the bloodstream and are not absorbed by the fetus, thus not affecting the growth and development of the fetus. Vaginitis during pregnancy can lead to chorioamnionitis, and intrauterine infection of the fetus may lead to premature rupture of membranes, subsequently causing preterm birth or miscarriage. During pregnancy, the vaginal environment undergoes changes. There is an increase in the number of vaginal epithelial cells and secretions, which appear as white, paste-like substances. The glycogen level in the vaginal epithelial cells rises, the lactic acid content increases, and the pH decreases, making it prone to fungal vaginitis. However, this environment is unfavorable for the growth of other pathogenic bacteria and is beneficial in preventing bacterial infections.