A fishy smell in the lower part of the body is a sign of vaginitis, especially bacterial vaginosis, and also needs to be excluded from cervical lesions. Bacterial vaginosis is one of the common types of vaginitis in women and is caused by anaerobic bacterial infection in the vagina. It is usually manifested by increased leucorrhea and a distinct odor in the leucorrhea, which is fishy, often more pronounced after rinsing with alkaline substances such as soap, and the diagnosis is clear when clue cells are seen in the leucorrheal discharge test. For bacterial vaginosis, metronidazole type anti-anaerobic treatment is given, often choosing topical metronidazole suppositories combined with oral metronidazole tablets, and the male partner also needs to be treated with oral metronidazole tablets to prevent cross-infection, and cervical TCT and HPV should be checked to exclude serious conditions such as cervical precancer or even cervical cancer.