A sour taste in the discharge is commonly caused by localized inflammation of the vagina, localized lesions of the cervix, and inflammation of the endometrium. 1. Localized inflammation of the vagina:When there is a localized inflammatory reaction in the vagina, the secretions will usually have a bad smell. Some people show a bad smell, and some people show a sour taste, it is recommended to do the routine examination of the leukorrhea in time. 2. Localized lesions of the cervix: for example, localized inflammatory reaction of the cervix, or precancerous lesions of the cervical epithelium, cervical cancer, etc., which may lead to the sour taste of the secretion. 3. Inflammation of the endometrium: when the endometrium has an inflammatory reaction, the endometrium will appear inflammatory exudate, and the inflammatory exudate contains a large number of pus cells, which can further lead to the secretion of the sour taste, and sometimes it will be manifested as a sour smell, it is recommended to do the routine examination of the white belt in a timely manner. The acidic flavor of the secretion is also related to other reasons, it is recommended to go to the hospital in time for relevant examinations, to clarify the cause of the disease and then symptomatic treatment.