Bronchitis is a common disease of lower respiratory tract infection, with cough and expectoration as the main clinical manifestations. Chest imaging showed thickening of bilateral pulmonary veins, which can be divided into acute bronchitis and chronic bronchitis. Bronchitis has symptoms of cough and expectoration, which are common. If accompanied by wheezing, chest tightness, shortness of breath, dyspnea and other symptoms may occur, which are usually related to allergic rhinitis and allergic asthma. Bronchial provocation test and exhaled nitric oxide test are needed to evaluate the level of airway inflammation and whether there is an attack of allergic bronchitis. The main manifestations of common bronchitis are cough and expectoration. If accompanied by fever, we should be alert to the possibility of pneumonia. In short, when bronchitis occurs in clinic, cough, expectoration, chest tightness and shortness of breath are the main manifestations, so it is necessary to consider whether to give antibiotics according to blood routine and chest X-ray examination.