The natural course of pneumonia is about 1-2 weeks, and the temperature may drop or gradually subside on its own within 5-10 days of onset. However, with the use of effective antibacterial medications, the temperature can return to normal within 1-3 days, and other accompanying symptoms will gradually disappear. However, the absence of fever in pneumonia does not mean that the inflammation in the lungs is completely absorbed, because the absorption of inflammation is slow and can take about 3-4 weeks to be completely absorbed. Therefore, if the pneumonia is not feverish, it is necessary to continue the medication treatment, such as changing the infusion treatment to oral antibacterial medication or other cough and phlegm medication at the same time, which can better treat the pneumonia. If pneumonia is not treated promptly, mechanization may develop and more serious lesions may form in the lungs.