Common symptoms of respiratory diseases are as follows: 1. Cough: Cough is a reflexive or voluntary, sudden, and explosive breathing action to clear material from the airways. Common causes of acute cough include upper respiratory tract infection, postnasal drip syndrome, acute exacerbation of chronic obstructive pulmonary disease, and lung infection. More common causes of chronic cough include chronic bronchitis, postnasal drip syndrome, post-infectious cough, gastroesophageal reflux syndrome, and lung tumors; 2. Hemoptysis: Hemoptysis is mostly a respiratory disease, but can also involve the cardiovascular system, hematologic diseases, and other systemic diseases. The amount of hemoptysis is blood in the sputum if the amount is small, and 300-600ml in 24 hours if the amount is large; the amount of hemoptysis is small when the bronchial mucosa and lung is congested; lung cancer is mostly blood in the sputum or a small amount of hemoptysis; bronchiectasis, bronchial mucosal ulcer, bronchial artery fistula, bronchial artery lesion and tuberculosis cavity wall aneurysm rupture can cause a large amount of hemoptysis, and a large amount of hemoptysis can cause airway obstruction and asphyxia, which is life-threatening; 3 The respiratory distress can be divided into acute, chronic and recurrent, and the respiratory distress can be divided into inspiratory, expiratory and mixed according to the respiratory phase. Respiratory distress often occurs rapidly when there is a large amount of pneumothorax and pleural effusion. Chronic bronchitis and chronic obstructive pulmonary disease take several years or even more than 20 years before dyspnea appears. Asthma manifests as recurrent dyspnea with croup, laryngeal edema, laryngeal or airway inflammation, and upper airway narrowing caused by tumors or foreign bodies, which manifests as inspiratory dyspnea with wheezing. Chronic bronchitis, chronic obstructive pulmonary and bronchial asthma present with expiratory dyspnea, obstructive lung disease with deep and slow breathing, restrictive lung disease, such as interstitial lung fibrosis, with shallow breathing; 4. Chest pain: chest paralysis includes soft tissue, rib pain is superficial pain, seen in thoracic trauma, rib fracture, costochondritis, herpes zoster, dry pleurisy, etc. Acute bronchitis, angina pectoris, esophageal disease, etc. are caused by deep pain. The clinical significance of chest pain is sometimes not easy to determine, and sometimes it indicates more serious disease, such as persistent knife-like pain from lung cancer metastasis to the rib cage.