Usually, if the sputum can be coughed up smoothly it is a sign of fast recovery. First of all, there will be a drop in body temperature, either gradually, or a return to normal body temperature. The sputum will become looser as the inflammation is gradually absorbed, and at this time a few gentle coughs of sputum will come out, indicating a sign of fast recovery. If you need to cough hard to cough out the phlegm, it is not a sign of fast recovery. In addition, if the inflammation is more serious and exudation is more, the sputum is also more abundant at this time. Although the phlegm can be coughed up, it is not a sign of quick recovery. The body temperature is also gradually increasing or staying high at this time, and there is no tendency for the body temperature to decrease. In addition, the sputum may appear as pus sputum. At this time, it is necessary to go for routine blood tests and chest CT to see if there is bronchitis or pneumonia. Routine blood tests can determine whether pneumonia or bronchitis is caused by bacterial infection.