Collapse of one side of the thorax can be caused by abscess or pleurisy, extensive pleural thickening adhesions and constriction, pulmonary atelectasis, pulmonary fibrosis, chronic fibrous tuberculosis, chronic pulmonary suppuration and other disorders. It is commonly associated with various pleural diseases and lung diseases. Such as pulmonary atelectasis, pulmonary atrophy, pulmonary fibrosis, extensive pleural thickening and adhesions, and post lobectomy. Easily confused with one side of the thoracic collapse symptoms: 1, thoracic deformity: chicken chest is the front wall of the chest is wedge-shaped convexity like the sternum of birds, so named. Funnel chest is a concave deformity of the anterior wall of the chest, like a funnel. These are two common thoracic deformities. 2, thoracic collapse: one side of the thoracic collapse can be caused by abscess chest or pleurisy, extensive pleural thickening adhesion and contraction, pulmonary atelectasis, pulmonary fibrosis, chronic fibrous tuberculosis, chronic pulmonary suppuration and other disorders. 3, rib and subpectoral inhalation depression: rib and subpectoral inhalation depression is a clinical manifestation caused by pediatric micromaxillary malformation syndrome. Micrognathiasyndrome is also known as cleft palate – micrognathiasyndrome – hypoglossal syndrome, micrognathiy-hypoglossal syndrome, micrognathiy-hypoglossal syndrome, inspiratory airway obstruction syndrome, Robin syndrome, Pierre-Robin syndrome and so on. This syndrome is characterized by congenital small jaw malformation, tongue prolapse, cleft palate and inspiratory airway obstruction in neonates and infants. The incidence of death due to airway obstruction caused by this syndrome is high. 4, continuous shackle chest: the degree of harm depends on the cause of injury, the site and extent of softening, the patient’s age and original cardiopulmonary reserve function, the presence of combined injuries. Shackle thorax mostly occurs in the lateral part of the thorax, and a small part occurs in the anterior thorax. In cases of thoracic trauma with multiple rib fractures and shortness of breath combined with shock, the presence of a hemopneumothorax with pulmonary contusion as the main pulmonary injury is first considered.