Fever after appendicitis surgery is often considered to be caused by the following factors: 1, residual infection, although the appendix has been removed, there will still be residual infection in the abdominal cavity. Need to actively give antibiotics for treatment, at the same time appropriate to drink more warm water, appropriate intake of fresh fruits and vegetables, as the infection is under control, the fever can be gradually normalized; 2, may be appendicitis stump fistula caused by some appendicitis is more serious, although the appendicitis stump has been stitched up, but there may be a local poor healing. At this time, you need to actively drain, and give antibiotics for treatment; 3, some patients are caused by lung infection, because the body’s resistance will be relatively poor after surgery. If the patient uses general anesthesia surgery, it will also affect the lungs and cause pneumonia and other diseases. So after the fever needs to find the attending physician as soon as possible for consultation, and give relevant treatment.