A fecal fistula is an abnormal passage between the genital organs and the intestine. The most common type of fistula in obstetrics and gynecology is the rectovaginal fistula. The main clinical manifestation of fecal fistula is vaginal defecation and, in severe cases, uncontrollable stool. It is usually not self-healing and requires surgical intervention. So, how is vaginal fistula diagnosed? The following are the diagnostic methods of vaginal discharge when stool is diluted: 1. Vaginal palpation, sometimes a fistula can be palpated in the posterior wall of the vagina. 2. 2. vaginal speculum examination, large fistula, which can be seen under vaginal speculum exposure, smaller fistula, or a small bright red granulation tissue can be seen. 3, methylene blue injection test, place gauze in the vagina, inject 10 ml of methylene blue through the rectum, after a few minutes remove the gauze and observe whether the blue stain can determine the presence of vaginal fistula. 4.Probe probe, insert a uterine probe through the vaginal fistula, and when the other finger is inserted into the anus, the finger end can touch the probe head. 5.Barium enema angiography, when a rectovaginal fistula exists, the barium is seen to flow into the fistula. It is a painful disease that brings great mental pressure to the patient. You need to be reminded that once you have such a case of vaginal discharge, you must go to a regular hospital for systematic examination to achieve early detection, early diagnosis and early treatment, which will avoid you many unnecessary tests and reduce your pain.