Bacterial vaginosis, also known as bacterial vaginosis, is not contagious. Bacterial vaginosis is a mixed infection of endogenous origin caused by a decrease in lactic acid bacteria and an increase in Gatnerella and other anaerobic bacteria in the vagina. It is characterized by an odorous leukorrhea, increased vaginal discharge and a large number of clue cells in the vaginal discharge, but there is no inflammatory reaction such as congestion of the vaginal mucosa on gynecological examination. The normal vaginal flora is dominated by lactobacilli, which produce hydrogen peroxide. If the number of hydrogen peroxide-producing lactobacilli decreases, the vaginal pH increases, the vaginal microecology becomes unbalanced, and other bacterial microorganisms multiply, leading to bacterial vaginosis. The cause of bacterial vaginosis is not known and may be related to frequent sexual intercourse, repeated vaginal irrigation, and other factors.