Tightness in the lungs is usually considered as a result of lung disease, pleural disease, and musculoskeletal disease of the chest. 1. Lung diseases: if there are bacterial infections in the lungs, pneumoconiosis, etc., due to the existence of solid or cavitary changes in the lungs, fibrosis, etc., it often causes tightness and pain in the chest cavity when breathing, and may be combined with symptoms such as tightness in the chest, shortness of breath, coughing and coughing up phlegm. 2. Pleural diseases: pleurisy, pleural tumor and other conditions, due to pleural lesions lead to the contraction of the chest cavity, resulting in obvious pressure, chest tightness and shortness of breath and other symptoms. 3. Chest bone and muscle diseases: when the local tissue contusion or rib fracture, the patient will feel chest pain and discomfort when breathing, and at the same time, the phenomenon of chest tightness will also occur. Lung tightness may also be seen in other diseases, such as lung tumors, angina pectoris, acute infarction and other heart diseases, patients are advised to actively consult the doctor for a clear diagnosis so as to take targeted treatment.