If the vaginal discharge is purulent, it is often due to the following clinical causes: first, gonorrhea caused by gonococcal infection. In this case, the patient often has a history of high-risk sex or multiple sexual partners, and after intercourse, the incubation period is about 2-3 days, there is a purulent vaginal discharge, and it is accompanied by frequent and urgent urination. After laboratory tests, it is often due to gonococcal infection. Secondly, purulent discharge due to acute inflammation in the vagina, such as trichomoniasis, can result in a large amount of yellow discharge with vulvar itching and in some cases, bladder irritation with frequent and urgent urination. Therefore, in the case of pus in the vagina, it is recommended to have a routine laboratory test of the leucorrhoea and only treat it according to the results.