When upper respiratory tract infections caused by cold and cough are difficult to control, the downward movement of bacteria can easily cause pneumonia; certain pneumonia can easily cause bronchial inflammation followed by cough. The classification and diagnosis of pneumonia are as follows: 1) pathogenic perspective is divided into viral pneumonia and bacterial pneumonia, mainly based on bacterial culture and sputum culture; 2) pathogenic bacterial infection perspective is divided into hospital-acquired pneumonia and community-acquired pneumonia, mainly based on the route of infection; 3) pathological type perspective is divided into lobar pneumonia, bronchopneumonia and interstitial pneumonia, mainly based on imaging.