Anal fistula is also a fairly common anorectal disease in daily life, causing a lot of inconvenience to people’s lives and endangering their health at the same time. The actual fact is that you can find out what kind of symptoms are usually present when suffering from anal fistula, here to learn more. The majority of the systemic symptoms do not have systemic symptoms, when the anal fistula invasion is larger and deeper or more branches, repeated inflammatory infection, will lead to wasting, anemia, constipation, defecation difficulties and other systemic symptoms. If the fistula is open without inflammation, there is generally no pain, only a slight local swelling of the anus, which can be aggravated when walking. If the external opening is closed, the fistula is filled with pus, or feces enters the fistula, the pain will increase or the pain will increase when defecating. Itching The skin of the anus often feels itchy due to the stimulation of pus and other discharges. Pus drainage is the main symptom. Generally speaking, newly created fistulae discharge more pus, and the pus is sticky, yellow and smelly; fistulae with long-lasting pus discharge are relatively less, or sometimes absent, and as thin as water; if the pus volume increases, it means that a new fistula is created. The fistula sometimes closes temporarily and does not discharge pus, resulting in localized swelling and pain and a rise in body temperature, and later the closed fistula breaks down and discharges pus again, or gas or feces may be discharged from the fistula.