The presence of cough for more than two months without improvement requires consideration of chronic inflammation, including both infectious and non-infectious factors, with blood tests, PPD tests, CT of both lungs, and examination of allergens and lung function. The more common clinical condition is tuberculosis caused by Mycobacterium tuberculosis infection, which should be treated with a combination of anti-tuberculosis drugs such as isoniazid, rifampin, pyrazinamide, streptomycin, and ethambutol after a clear diagnosis. In addition, for non-infectious factors, the most common one is cough variant asthma, which is a type of allergic asthma. Glucocorticoids such as dexamethasone and bronchodilators including salbutamol, terbutaline and ipratropium bromide should be given. Anti-allergic drugs can also be given in combination, including cetirizine, loratadine, ketotifen, montelukast sodium, etc. In this case, cough symptoms can be improved by systematic and standardized treatment.