Diaphragmatic hypoplasia is a diagnostic imaging sign of emphysema, lung abscess, or tracheal foreign body on lung x-ray. Its etiology is commonly associated with emphysema, lung abscess, or tracheal foreign body. Prevention of diaphragmatic hypoplasia due to emphysema: 1. The prevention of chronic emphysema requires strengthening the body’s cold-resistant exercise, enhancing the ability to resist disease, and preventing colds and influenza. 2. Patients with emphysema need to quit smoking and reduce dust and harmful gases in the indoor air. This is one of the preventive measures for chronic emphysema. 3, emphysema patients also need to avoid eating spicy and fatty products, and reduce the amount of salt. This is also part of the prevention of chronic emphysema. 4, chronic emphysema patients can do abdominal breathing exercises, which is conducive to improving ventilation and strengthening physical fitness. 5, do a good job in the mental care of emphysema patients, so that patients are emotionally cheerful, relaxed, happy and optimistic. This is also effective for the prevention of chronic emphysema.