A positive vaginal discharge of hydrogen peroxide usually indicates that the patient has bacterial vaginitis. Bacterial vaginitis is a common gynecological disease that begins to flare up when the ecological balance of bacteria that normally live in the vagina is disrupted. It occurs in sexually active women, and factors such as sexual confusion, vaginal douching, and frequent sexual intercourse can affect the microenvironment of the vagina, leading to the onset of the disease. Patients often experience increased vaginal discharge, itching or burning sensation in the vulva, which can be grayish-white, thin and smelly. If a patient suspects that she has bacterial vaginitis, she should go to the hospital for tests such as vaginal discharge smear, amine test and vaginal pH measurement to confirm the diagnosis. Treatment of the disease is based on the use of anti-anaerobic drugs to improve symptoms and restore the ecological balance of bacteria in the vagina, either orally or intravaginally with suppositories, such as metronidazole, tinidazole, clindamycin, etc. In daily life, patients should maintain good habits and wash the vulva with running water every morning and evening to keep it clean. After going to the toilet, wiping should be done from front to back to avoid pathogenic bacteria infection.