Before the Chinese New Year, several patients with complex anal fistulas were seen in the outpatient clinic, mainly because they wanted to use the long break to be hospitalized for surgery. Complex fistulas are characterized by more than one fistula, a curved course, a deeper location, and in some cases a longer duration of disease, combined with diabetes and tuberculosis. This ultimately leads to difficult surgery, slow recovery, individual complexities requiring secondary surgery, etc. It is important to remind people that anal fistula must be treated surgically. The first thing you need to do is to have a surgery as soon as possible after the diagnosis is made. However, if the condition is serious, not only will the hospital stay be long and painful, but there will even be slight anal sequelae. Also tell us that anal fistula left untreated for a long time will have the possibility of malignant change!