The main reasons why patients with pneumonia do not reduce their fever are as follows: 1. the choice of drugs is not sensitive, which is one of the most common reasons, that is, the causative agent of pneumonia is not sensitive to drugs or has developed drug resistance, thus not effective, the persistence of inflammation caused by the persistence of fever does not subside. 2. the use of drugs is too short, some patients with pneumonia have a large area of infection, often need 5-7 days to really reduce the fever. The effect of 1-3 days of use is not always visible. 3. The presence of poor drainage in the lungs, such as the common right lung lobar pneumonia, often takes a relatively long time to reduce fever, or the presence of stenosis in the bronchi of the lungs, the inflammation of the lung tissue does not dissipate easily, resulting in a persistent fever that does not subside. 4. 5. The diagnosis of pneumonia is wrong, such as not bacterial pneumonia but viral pneumonia, which is naturally ineffective with ordinary antibiotics, allergic pneumonia patients who blindly use antibiotics are also ineffective, or obstructive pneumonia caused by malignant tumors in the lungs, which are treated less effectively.