Pneumonia persistent high fever does not go down can be considered to be related to the poor effect of drug treatment, the patient’s poor physical condition, complications and other reasons. 1. Poor drug treatment: Pneumonia persistent high fever can be considered the use of drugs is not effective, the use of drugs is not symptomatic or pneumonia bacteria are not sensitive to drugs, such as fungi, tuberculosis and other special pathogens, the application of antibiotics is ineffective, unable to control the condition of pneumonia. 2. Poor physical condition of the patient: Pneumonia persistent high fever does not go down, but also consider the patient’s own poor physical condition, the patient’s body there are diabetes, systemic lupus erythematosus and other chronic diseases, affecting the treatment of the disease. 3. Complications: Pneumonia persistent high fever may be the patient’s condition further aggravated, the emergence of pneumonia serious complications such as abscess chest. 4. Non-infectious factors: such as allergic pneumonia, due to the recent inhalation of allergens, the application of antibiotics is not effective, need to get rid of the allergens based on the application of antibiotics such as levofloxacin, anti-allergy drugs such as loratadine, in order to improve. In addition, there are other diseases that can lead to high fever, such as special pathogen infection (fungus, tuberculosis, etc.), need to improve the relevant examination in a timely manner, if necessary, by the doctor to redefine the treatment plan.