People with anal fistulas have very obvious symptoms, and it is these symptoms that usually lead people to check their bodies, and the symptoms are also very sensory. Itching. The anal fistula is an inflammatory disease that is causing secretions to appear, and the secretions flowing from inside the fistula will stimulate the anus and lead to itching, plus the skin at the anus is very sensitive, and prolonged stimulation will lead to itching and moist skin. Painful sensation. The patient may not feel pain at first, but slowly as the condition worsens, the blockage of the fistula, pus or secretion accumulation and poor drainage will aggravate the pain, and if not actively treated, it is more and more intense. It is very difficult to defecate. This is the first symptom found in some patients, as the fistula forms a narrow ring in the rectum, making it difficult to defecate. Pus flow. This is because anal fistulas are mostly the sequelae of perianal abscesses. Initially, there is more pus flowing, with a fecal odor, yellow and thick, and over time, the pus is sparse and sometimes absent. If the pus suddenly increases again and there is anal pain, this may become serious and a new branch may form. If the pus flows for a long time and the pus is thin but has a putrid smell, you need to go to the hospital promptly for examination. Anal fistula should be treated aggressively because there are so many complications that no one can make predictions.