Low fever after sinusitis surgery may be caused by postoperative absorption fever or postoperative infection, which can be treated by physical cooling and medication. 1. Postoperative absorbed fever: it refers to mild fever within 38°C after surgery, usually fluctuating between 37.5°C and 38.5°C. The fever can be lowered by physical cooling methods, such as forehead, axilla, and armpit. It can be cooled down by physical cooling methods, such as forehead, armpits, hands and feet to wipe down the temperature, postoperative absorption of heat can be eliminated by itself. 2. Postoperative infection: Nasal cavity is a cavity containing bacteria, postoperative bacterial infection is a normal phenomenon, the routine use of antibiotics to fight infection, to be the effect of drugs after the body temperature can be gradually recovered. If you have low fever after sinusitis surgery, you can actively feedback with your doctor and standardize the medication and treatment after systematic examination to clarify the cause of the disease.