It is definitely not normal to have pus after anal fistula surgery, but patients sometimes find it difficult to distinguish whether this pus is real pus or fake pus, because the surgical wound is open there will be some exudation, there will be secretions and even intestinal fluid overflow, many patients will take these secretions, overflow, intestinal fluid as pus. In fact it is not pus, it is normal fluid, secretion, intestinal fluid. If it is pus, it is definitely not normal. If there is pus, it means that there is a pus cavity that has not been treated. If there is indeed pus, the surgeon needs to probe again for any missed pus cavity. In fact, most patients still have pus just after surgery, and this pus is actually common secretions and intestinal fluids. Some patients may ask when this secretion will be less or absent. It needs to be decided according to the size of the surgical incision, and generally the secretion will disappear completely after the surgical incision is completely healed. If patients are not sure whether it is pus or normal secretion, they can consult with the surgeon when changing the medication, and usually the surgeon will explain and check carefully.