If the vaginal discharge has a sour smell, the most common clinical cause is localized inflammation of the vagina. If you don’t take good care of your vulva in your daily life, pay attention to your sexual hygiene, or don’t change your sanitary napkin in time during menstruation, it may cause pathogenic bacteria to enter the vagina and cause bacterial reproduction, resulting in localized inflammation of the vagina, which can lead to increased secretions with a bad smell. Clinically, as long as the inflammation of the vagina is actively treated, it is also recommended that women do cervical cancer screening once a year, and if no screening has been done in a year, it is recommended to do it as soon as possible to rule out the possibility of cervical epithelial lesions. In the early stage of cervical cancer or cervical epitheliopathy, vaginal secretion may also show odor, which should be taken seriously.