Common respiratory symptoms are divided into upper respiratory tract and lower respiratory tract symptoms. Upper respiratory tract symptoms are commonly found in nasal congestion, sneezing, runny nose, sore throat, itchy throat, and phlegm in the throat. Lower respiratory tract symptoms are commonly found in the bronchial tubes and lungs, often with cough, coughing, chest tightness, shortness of breath, etc. The location of the disease can be basically determined based on the common symptoms in respiratory medicine. If it is an upper respiratory tract infection, it is usually a relatively mild condition. If it is accompanied by chest tightness, dyspnea, coughing and coughing with severe sputum, it is mostly due to bronchopulmonary infection, lung abscess, pneumothorax or other acute attacks of chronic bronchitis, etc.