As with other systemic diseases, a thorough and detailed history and physical examination is the basis for the diagnosis of respiratory diseases, and X-ray chest examination plays a special and important role in lung lesions. As respiratory diseases are often a manifestation of systemic diseases, they should be combined with routine laboratory tests and other special examination results to conduct a comprehensive analysis, and strive to make a diagnosis of etiology, anatomy, pathology and function. 1, medical history Understand the occupational and personal history of toxic substances to the lungs. Such as whether exposure to a variety of inorganic, organic dust, moldy hay, air-conditioning; ask about smoking history, there should be a quantitative record of the number of packs per year; there is no raw food crabs or mayflies and may be infected with Schistosoma pneumoniae a history of; has the use of certain drugs can lead to lung lesions, such as bleomycin, ethamiodarone may cause pulmonary fibrosis, beta; -adrenergic blocking agents can lead to bronchospasm, aminoglycoside antibiotics can cause Respiratory muscle muscle strength is reduced, etc.; There are also some hereditary diseases, such as bronchial asthma, alveolar micronodular disease, etc. can have a family history. 2.Symptoms Respiratory cough, sputum, hemoptysis, shortness of breath, croup, chest pain and other symptoms. 3.Signs Due to the different nature and scope of the lesions, the signs of chest diseases can be completely normal or obvious abnormalities. Tracheobronchial lesions are mainly characterized by dry and wet rhonchi; inflammation of the lungs has changes in the nature, tone and intensity of respiratory sounds, such as large-scale inflammation with solid signs; pleural effusion, pneumothorax, or pulmonary atelectasis can be accompanied by corresponding signs, which may be accompanied by tracheal displacement. Thoracic diseases may be accompanied by extrapulmonary manifestations, and common ones include pestle-like fingers (toes) of bronchopulmonary and pleural septic lesions; pulmonary osteoarthropathy and pestle-like fingers caused by certain bronchopulmonary carcinomas, and paraneoplastic syndromes due to ectopic endocrine clusters, and so on.