Bacterial vaginitis is an infection caused by a mixture of Gatnerella and anaerobic bacteria, which can lead to an imbalance in the micro-ecological balance of the vagina, resulting in increased vaginal discharge, fishy smelling leucorrhea, and vulvar itching. The main ways of infection are the following four: first, indirect contact infection, which means contact with bacterially contaminated public toilets, toilets, bath tubs, baths, towels and unclean toilet paper, can cause infection. The second, sexual life, one of the causes of the onset of the disease. If the female partner has symptoms, at least 10% of the male partner has bacterial UTI, and women with vaginitis considered, there may be male bacterial UTI transmission. The third reason is that a lot of antibiotics change the microenvironment of the vagina and the pathogenic bacterial pathogens can multiply and lead to localized bacterial vaginitis. After taking a lot of antibiotics, the vaginal flora becomes dysbiosis, like the lack of lactobacilli, and the pathogenic bacteria can multiply and cause bacterial vaginitis. Fourthly, excessive hygiene. In order to maintain hygiene, some women often douche their vaginas repeatedly with medication, which can easily damage the vaginal acid-base environment and cause bacterial vaginitis. So bacterial vaginitis is mainly caused by these four aspects.