Symptoms of high anal fistula include parianal pus, perianal itching, perianal pain, and systemic symptoms. 1. Para-anal pus: fecal water or purulent or bloody secretion will flow out of the external mouth intermittently or continuously, and sometimes there is even feces or gas discharged. 2. Perianal itching: localized itching of the skin will occur, and if the condition is serious, eczema-like changes will occur. 3. perianal pain: if the fistula drainage is smooth, there are no symptoms, if the external mouth is closed, the pollutants in the fistula can not flow to form pus will appear pain, redness and swelling and other symptoms. 4. systemic symptoms: if the external mouth drainage is not smooth will cause acute inflammation, some patients have fever, chills, fatigue and other symptoms. If the above symptoms occur, it is recommended to consult a doctor in time, and actively treat under the guidance of the doctor to avoid delaying the condition.