Insufficient lung expansion can be caused by the following diseases:1. Tuberculosis hyperplasia can present with insufficient lung expansion, and the patient will also be accompanied by symptoms of tuberculosis, such as coughing, coughing up sputum, low-grade fever, fatigue, night sweating, and emaciation, etc. The sputum can be found to be resistant to bacilli, and the patient should undergo anti-tuberculosis treatment after the diagnosis is confirmed.2. Chronic inflammation in the lungs, especially in the middle lobe of the right lung, can present with insufficient lung expansion. If the patient is due to pneumonia and lung expansion insufficiency, first of all, antibiotics should be used for treatment, on the basis of antibiotic treatment, bronchoscopy intervention can be considered.3, lung tumors can also appear lung expansion insufficiency, can be diagnosed through bronchoscopy, puncture biopsy, and after the diagnosis is clear, surgical treatment, radiotherapy, chemotherapy, etc. can be considered.