Restrictive hypoventilation is a diagnosis of pulmonary function or clinical subdivision, and the causes of restrictive hypoventilation are mainly divided into the following categories: 1, central causes, which can cause the inability of the thoracic muscles to move and the inability of the thorax to move; 2, muscular causes, such as restricted respiratory muscles, some specific diseases that cause the inability of the respiratory muscles to be used, which cannot cause thoracic movement or thoracic activity and further cause ventilation disorders; 3, lung itself restriction , reduced compliance or severe pleural hypertrophy, such as tuberculous pleurisy, severe pleural hypertrophy, etc., can cause restrictive thoracic movement disorders. Multiple rib fractures caused by trauma, i.e., continuous shackle chest, can also be caused by using something to fix after trauma. Diffuse lung lesions, common interstitial lung diseases, and interstitial fibrosis of the lung can cause restrictive ventilation disorders. Some diseases cause decreased lung compliance, which can also cause the above symptoms.