Pulmonary alveoli are generally difficult to heal on their own. The formation mechanism of pulmonary alveoli is as follows: due to the narrowing and obstruction of fine bronchial tubes caused by various reasons, it is difficult for air to be discharged from the alveoli after entering the lungs, and the alveoli are in an over-expanded state for a long period of time, resulting in a decrease in their elasticity. Some of the alveoli rupture due to the lack of elasticity, and form alveoli after fusing with each other. Because of the irreversible transformation of the alveoli, it is difficult for the alveoli to disappear on their own without special treatment. Once an alveolus ruptures, it may cause a spontaneous pneumothorax with symptoms such as dyspnea and chest pain. Without timely treatment, the condition will progress further and severe lung function impairment may occur. It is recommended to seek prompt medical attention after diagnosis of an alveolus to avoid serious and irreversible consequences.