If the cough has not cleared up after a week, it is very likely that a respiratory infection has occurred, and if the infection does not get better and spreads downward, it may cause bronchitis or pneumonia, which will be more difficult to recover from. At this time, we must do chest CT or flat film examination to confirm the diagnosis, if there is indeed the case of pneumonia, need to be hospitalized for infusion treatment, oral medication is often not effective enough. In addition, blood tests, C-reactive protein and mycoplasma antibodies should be checked. If there are elevated leukocytes in the blood count, it is a bacterial infection, and intravenous levofloxacin or penicillin is recommended to reduce the inflammation. If the C-reactive protein is simply elevated, it is often a viral infection, and intravenous ribavirin can be ordered. If the mycoplasma antibody is positive, it is mycoplasma infection, which requires intravenous azithromycin. In addition, a one-week cough may be accompanied by cough variant asthma, which requires the use of Symbicort to relieve the symptoms of cough.