Anal fistula, the full name of which is anorectal fistula, is known as anal leakage in Chinese medicine, and is generally a post-abscess lesion that occurs around the anorectum when an abscess breaks down or is incised and drained. Anal fistula is the post-abscess era, and the two are two stages of one disease. An anal fistula is a pathological duct that connects the anal canal to the rectum, with one end leading to the foci of infection in the anal sinus and anal glands within the anal canal, called the internal port, and the other end leading to the perianal skin, called the external port. The main symptom of anal fistula is the constant outward flow of pus or pus and blood from the external opening, sometimes accompanied by lumps, itching, eczema and pain, and in severe cases, systemic symptoms. Once formed, anal fistula has very little chance of healing itself, and most require surgery. Many patients are afraid of surgery and delay it again and again, even for decades, resulting in many hazards, the most common of which are the following. The most common ones are the following: anorectal stenosis, scar contracture due to repeated inflammatory stimulation over the years, narrowing of the anus, anal canal and rectal cavity to the point of thinning and flattening of the stool, and difficulty in passing stools. Some people do not go through the examination think they are habitual constipation, and by a large number of Chinese and Western medicine treatment effect is not obvious. Hazard two anal incomplete incontinence Due to repeated attacks of anal fistula, resulting in extensive infection of the muscles and soft tissues around the anal canal and rectum, a large number of connective tissue proliferation, hardening, loss of elasticity around the anus, thus affecting the closing function of the anus, sometimes it is difficult to control the thin stool, resulting in incomplete anal incontinence. The most important thing is that you can get a good idea of what you’re doing. The secretions also contaminate the underwear and give off a foul odor. This can seriously affect people’s work and life. The first thing you need to do is to get a good idea of what you are getting into. The fistula can also form a recto-vaginal fistula, recto-urethral fistula and recto-vesical fistula, which endanger the surrounding organs. The risk of fistulas becoming cancerous is the result of long-term chronic inflammatory stimulation and bacterial infection, which stimulates abnormal cell proliferation and causes destruction of the lymphatic structure in the local area, lowering immunity and making the fistula tissue gradually cancerous. This is manifested by the discharge of mucus-like secretions from the external opening of the fistula and the brittle scar tissue that bleeds easily after cutting the fistula. In short, anal fistula should be diagnosed early and treated promptly so as not to delay the best time for treatment and make the condition serious.