1, chest trauma: pneumothorax; hemothorax; hemopneumothorax; lung laceration; foreign body in the chest cavity, etc. 2, spontaneous pneumothorax; blood, pneumothorax; pulmonary alveoli, etc. 3, pleural disease: pleural effusion; acute abscess chest; pleural tumor: such as pleural mesothelioma, etc. 4, lung disease: diffuse lung disease; substantial lung tumors: such as misfolded tumors, lung cancer, etc. 5, pericardial disease: pericardial effusion, pericardial tamponade, pericardial cyst, etc. 6.Mediastinal diseases: mediastinal cyst, teratoma, neurological tumor, thymoma, retrosternal goiter, etc. 7.Esophageal diseases: esophageal smooth muscle tumor, esophageal diverticulum, esophageal cancer, cardia cancer, cardia incontinentia, etc. 8, chest wall diseases: benign and malignant tumors of the chest wall, chest wall tuberculosis, etc. 9.Other: hand sweating, diaphragmatic hernia, benign and malignant tumor of diaphragm, etc.