The severity of left lung pustules mainly depends on the location, size and number of pustules. Left lung pulmonary blisters at the tip and edge of the lung, and the diameter is larger than 5cm, the site is more by the edge of the lung blisters are more serious, easy to occur spontaneous pneumothorax. The greater the number of pulmonary blisters, the greater the risk of patients, especially at the tip and edge of the lung alveoli are easy to merge, in the cold, cold, coughing hard, hard labor, running, exercise, diving and other heavy physical activities triggered easily spontaneous pneumothorax, resulting in respiratory difficulties. Therefore, the severity of left lung pustules depends on the size, number and location of the alveoli. Severe pustules require surgical intervention by a thoracic surgeon, while ordinary pustules, which are on the inner and lower ends of the lungs, are relatively less affected.