Pneumonia will appear high fever phenomenon, may be because the degree of lung infection is more serious, and at the same time not to be effective anti-infective treatment, the anti-infective drugs do not cover the pathogenic or produce the corresponding drug-resistant bacteria, antibiotic strength is not enough, then it is difficult to control the lung infection, the phenomenon of recurrent high fever. It should also be noted that some patients may have secondary complications that can also lead to high fever, such as pleural effusion, pyothorax, lung abscess, bloodstream infection, and also pay attention to the exclusion of extrapulmonary infections, such as liver abscess. Some patients can also be non-infectious factors cause high fever, such as drug fever, connective tissue disease, or lymphoma lung infiltration manifested as pneumonia-like changes, at this time need to improve the corresponding examination to clarify the cause of the disease. Therefore, for the recurrent high fever of pneumonia, only when the cause of the fever is clear, the treatment of the cause of the fever can better control and alleviate the degree of fever.