What causes bubbles in the lungs?

Pulmonary bullae are mainly caused by obstruction of bronchioles, more gas into the less, or only into the rupture, resulting in alveolar expansion and the formation of pulmonary bullae. In clinical can show one or more pulmonary bullae. For patients with pulmonary bullae, if the volume is small and there is no obvious clinical symptoms, there is generally no need to worry too much. If the pulmonary bullae are relatively large, they seriously affect the patient's life and show a series of clinical symptoms, such as chest tightness, shortness of breath, and it is generally recommended to be surgically removed.