Bronchitis is an inflammatory change in the mucous membrane of the trachea and bronchi caused by viral or bacterial infection or physicochemical irritation, and is divided into two types: acute and chronic. The symptoms of acute bronchitis are: the onset of the disease may be characterized by symptoms of respiratory infection, nasal congestion, runny nose, sore throat, hoarseness, etc., accompanied by low-grade fever, fear of cold, weakness, coughing, and coughing up phlegm easily. The symptoms of chronic bronchitis are: recurrent and gradually worsening cough, which is more intense after waking up in the morning and less intense during the day, and in severe cases, uncontrollable cough that occurs both day and night. Sputum is mostly white, sticky, and foamy. When combined with respiratory tract infections, symptoms of wheezing can occur, and the infection is easily recurring due to the seasonal temperature. Most of the early stages do not have special signs, and dry and wet rales can be heard. Therefore, there are two types of bronchitis, acute and chronic, but the symptoms are dominated by coughing and coughing, if the patient has the above symptoms, you can go to the hospital for further examination to confirm the diagnosis.