Pneumonia fever usually lasts for 1-3 days, provided that it is under the use of effective antibiotics. Pneumonia refers to the inflammation of lung tissues, of which bacterial pneumonia is the most common, belonging to the infectious diseases, can cause chills and fever, cough and sputum, chest pain and other symptoms, the bacteria multiply in the body can cause symptoms of high fever, the peak of fever can be reached within a few hours, the temperature can be up to 39 ℃ or more. Under the effect of effective antibiotics, the patient’s fever symptoms can return to normal in about 1-3 days, rarely more than 5 days. However, if the symptoms of high fever persist for more than 3 days, it is necessary to consider that the bacteria are not sensitive to the drugs, and it is necessary to carry out sputum culture drug sensitivity test, and select sensitive antibiotics according to the drug sensitivity test, or to consider that the patient himself exists the underlying disease, such as diabetes mellitus, acquired immunodeficiency, etc., and it is also necessary to treat the underlying disease while treating the pneumonia, so as to dissipate the inflammation of lungs quickly, and the symptoms of fever and cough will disappear.