Bronchitis is mainly caused by viral or bacterial infection, clinical can be divided into acute bronchitis and chronic bronchitis, its X-ray performance can not be generalized, need to be based on specific conditions, with individual differences. 1. Acute bronchitis: acute bronchitis is often manifested as upper respiratory tract infection symptoms in the early stage of the disease, X-ray chest radiographs can be no abnormality, some patients can be manifested as an increase in lung texture, the patient usually exists in nasal congestion, runny nose, sore throat and hoarseness and other clinical manifestations. Bronchitis often causes respiratory difficulties, so patients with a long course of the disease can be combined with emphysema. 2. Chronic bronchitis: chronic bronchitis is often seen in the elderly, clinical manifestations of cough, sputum, wheezing, the annual onset of the disease usually lasts three months or more than three months, more than two years in a row. x-ray manifestations of increased lung texture, disorders, slender, reticulate, cord shadows, to the lower lungs of the two more pronounced, the combination of the infection can be seen in the case of patchy images.