Restricted emphysema is caused by local bronchial inflammation resulting in repeated local bronchial infections, and local bronchioles can collapse. During inspiration, the local lumen expands and air enters the alveoli, while during expiration, the bronchi collapse and some air cannot come out of the alveoli, causing the alveoli to gradually grow and even fuse to form restrictive emphysema in the long run. If restrictive emphysema is found, it is best to have a chest CT for further examination to exclude other diseases, such as foreign bodies or tumor-induced lumen blockage. If there is no such condition, clinical observation and regular follow-up can be performed.