There are many kinds of respiratory diseases. According to the structure and pathophysiological characteristics of the respiratory system, they are mainly divided into three major categories: airflow-restrictive lung diseases, restrictive ventilation function lung diseases, and pulmonary vascular diseases. 1. Airflow-restrictive lung diseases: mainly including asthma, chronic obstructive pulmonary disease, bronchiectasis, bronchiolitis, etc. 2. Airflow-restrictive lung diseases: mainly including interstitial lung diseases, pulmonary nodules, idiopathic pulmonary fibrosis, hypersensitivity pneumonitis, pneumoconiosis, amyotrophic lateral sclerosis, ankylosing spondylitis and so on. 3. Pulmonary vascular diseases: mainly including pulmonary embolism, pulmonary hypertension, pulmonary veno-occlusive disease, bronchopulmonary cancer, tuberculosis, new respiratory infections, etc. Local symptoms of respiratory system mainly include coughing, coughing up sputum, dyspnea, hemoptysis, chest pain, etc. If you have such symptoms or feel unwell, you should consult a doctor in time to avoid delaying your condition.