Bronchitis includes acute chronic bronchitis, which is an infectious disease of the lower respiratory tract. Allergic cough mainly includes allergic rhinitis, allergic pharyngitis, cough variant asthma, belonging to respiratory allergic diseases. Clinical manifestations of both can appear cough, less sputum, accompanied by chest tightness, shortness of breath and so on. Clinical chest imaging examination, can be found in bronchitis double lung texture increase, coarsening, disorder, allergic cough chest imaging is mostly normal. Bronchial excitation test and exhaled breath nitric oxide test can further understand the patient’s airway inflammation level, if the level of inflammation is high, mostly suggesting allergic cough, airway inflammation level is not high, mostly respiratory tract infectious diseases, including acute and chronic bronchitis. Clinical treatment of the two is different, bronchitis is mainly given antibiotics and symptomatic cough and phlegm treatment. Allergic cough is preferred to glucocorticoids and anti-allergic drugs, representing drugs such as sulpiride, Cymbalta, tiotropium bromide, montelukast sodium, ibastine, loratadine and other drugs.