As with other systemic diseases, a thorough and detailed history and physical examination are the basis for the diagnosis of respiratory diseases, and X-ray chest examination has a special and important role in pulmonary pathology. Because respiratory diseases are often a manifestation of systemic diseases, they should also be combined with routine laboratory tests and other special examination results to make a comprehensive and integrated analysis, and strive to make a diagnosis of etiology, anatomy, pathology and function. 1, medical history to understand the occupational and personal history of substances toxic to the lungs. Such as whether exposure to a variety of inorganic and organic dust, moldy hay, air conditioning units; when asking about smoking history, there should be a quantitative record of the number of annual packs; whether there is raw food stream crab or ? Mayfly and may be infected with lung bilharzia a history; whether the use of certain drugs that can cause lung lesions, such as bleomycin, acetaminophen may cause pulmonary fibrosis, beta; – adrenergic blockers can lead to bronchospasm, aminoglycoside antibiotics can cause respiratory muscle muscle strength reduction, etc.; and some hereditary diseases, such as bronchial asthma, alveolar microstomia, etc. can have a family history. 2.Symptoms Respiratory symptoms such as cough, sputum, hemoptysis, shortness of breath, croup, chest pain, etc. 3.Signs Due to the different nature and scope of lesions, the signs of chest diseases may be completely normal or appear significantly abnormal. Tracheobronchial lesions are characterized by dry and wet? Pulmonary inflammatory lesions have changes in the nature, tone and intensity of breath sounds, such as large inflammatory lesions showing solid signs; pleural effusion, pneumothorax, or pulmonary atelectasis may show corresponding signs, which may be accompanied by displacement of the trachea. Chest disorders can be accompanied by extra-pulmonary manifestations, such as pestle finger (toe) in bronchopulmonary and pleural septic lesions; pulmonary osteoarthropathy, pestle finger due to certain bronchopulmonary carcinomas, and paraneoplastic syndrome due to ectopic endocrine syndrome.