Inflammation of the internal opening of the anal fistula is usually painful. Inflammation of the anal fistula can be treated with medication and surgery under the guidance of a doctor. Inflammation of anal fistula usually refers to the fistula that occurs near the anus and in the lower part of the rectum, which is composed of three parts: the internal opening, the external opening and the fistula. Inflammation of the internal opening of the anal fistula may be due to infection, low immunity, local damage and other factors, resulting in pain, fever, redness and swelling around the anus. Medications such as levofloxacin tablets and bismuth gentamicin carbonate sulfate capsules can be used under the guidance of a doctor, which can play an anti-inflammatory and antibacterial role, and surgical procedures such as anal fistulotomy and anal fistulotomy can also be taken under the guidance of a doctor to treat the condition. If the phenomenon of inflammation of the inner mouth of the anal fistula, should go to the hospital in time, so as not to delay the condition, the adverse consequences; daily life, should pay attention to rest, appropriate exercise, reasonable diet, balanced nutrition, prevention of constipation and diarrhea.