High complex anal fistula has a certain recurrence rate, and according to domestic and foreign literature, the postoperative recurrence rate of anal fistula in China is about 3%-18%. In experienced anorectal centers, the postoperative recurrence rate of anal fistula is low, only 2%-3%. There are many reasons for postoperative recurrence: 1, for example, the internal port is the root cause of the lesion, and due to the complexity of the disease itself, there may be many internal ports, which can lead to recurrence if the internal port is not treated or is missed in treatment; 2, there are intraoperative branched residues that are not explored at all during surgery; 3, for example, postoperative medication changes are not in place formation of pseudo-healing; 4, the location of the fistula is too high, and in order to protect the anal function, no radical surgery is performed during incision and drainage; 5, some diseases can easily induce anal fistula, such as diabetes, inflammatory bowel disease, tuberculosis, which are not actively treated or the primary disease is not treated thoroughly, which can lead to recurrence. Excluding the cause of surgery, anal fistula is caused by anal gland infection, and the surgically treated anal gland usually does not reoccur anal fistula, while the non-operated anal gland still has the risk of reinfection, so strictly speaking it cannot be called a recurrence, but only a reoccurrence. The actual fact is that you will be able to get a lot more than just a few of these.