The main danger of pulmonary blisters is that they can affect lung function and can rupture and cause pneumothorax. Pneumomediastinum can gradually increase in size and flatten the surrounding normal lung tissue, significantly affecting lung function. In some severe cases, they can even cause breathing difficulties at rest, significantly affecting lung function. When the pulmonary blister grows on the surface of the lung, the pressure in the thoracic cavity and abdominal cavity suddenly rises when coughing or stooling hard, and the blister will rupture. After the rupture of the pulmonary blister, the rupture will be closed quickly and the gas leaked out is not much, so it can be absorbed slowly by itself. If the lung compression is >30%, a chest drainage tube will be placed and connected to a negative pressure bottle, so that the gas can only be discharged from the chest cavity to the outside world, not from the outside world into the chest cavity to gradually finish the gas in the chest cavity.