Postoperative infections are infections that occur in the body after surgery, which can be divided into bacterial and fungal infections, and the sites can be divided into respiratory infections, incisional infections and organ infections in the chest or abdominal cavity. Respiratory tract infections are often caused by low body resistance after surgery, when exposed to bacteria or viruses, resulting in respiratory tract infections, which can be treated by regular anti-inflammatory treatment, along with nebulization and other treatments. Incisional infection refers to obvious redness and exudation of the incision, often caused by the exudation of organ infections.