Pulmonary function includes ventilation function and diffusion function, so pulmonary dysfunction often refers to pulmonary ventilation dysfunction or diffusion dysfunction, as follows: 1. Pulmonary ventilation dysfunction: mainly seen in obstructive diseases, such as chronic obstructive pulmonary, asthma, but also includes atmospheric airway obstructive diseases, such as foreign bodies, atmospheric airway tumors; 2. Pulmonary diffusion dysfunction: mainly refers to the patient’s oxygen diffusion dysfunction, clinically mainly seen in ARDS, and interstitial lung disease. For what specific disease it is, patients need to go to a specialist hospital and have a detailed examination in order to find out what causes the pulmonary malfunction. Once the cause of pulmonary dysfunction is identified, treatment can be administered accordingly.