Pneumothorax is a condition in which gas enters the pleural cavity and causes pneumatization, called pneumothorax. Mostly due to pulmonary diseases or external influences that rupture lung tissue and dirty pleura, or rupture of fine emphysema bubbles near the surface of the lung, the air in the lung and bronchus escapes into the pleural cavity. Those caused by chest wall or lung trauma are called traumatic pneumothorax; those caused by lung tissue rupture due to disease are called “spontaneous pneumothorax”, and those caused by artificially injecting air into the pleural cavity due to treatment or diagnosis are called “artificial pneumothorax”. The lungs are like two balloons in the chest cavity, there is a chest wall on the surface of the lungs and two layers of pleural membrane between them, the air pressure between the two layers is much less than the air pressure inside the lungs, so the lungs will not collapse in the state of expiration and inspiration. If a pneumothorax occurs, it means that there is gas entering the pleural cavity and the air pressure inside the pleural cavity rises and squeezes the lung. One situation is that the pleural cavity suffers an external impact that triggers a perforation of the pleura, and outside gas enters the pleural cavity and squeezes the lung, non-inhalable gas and symptoms of dyspnea occur. Another situation is that one suffers from lung diseases, such as chronic obstructive pulmonary disease, asthma, etc., which may lead to pulmonary alveoli on the surface of the lungs, and if the alveoli rupture, the air inside enters the chest cavity, which may also squeeze the lungs.