Cough after radiotherapy is often caused by two reasons: 1, radiation pneumonitis, radiotherapy in the chest will cause pulmonary fibrosis, resulting in radiation pneumonitis, at this time should be carried out anti-inflammatory, phlegm, asthma treatment, traditional Chinese medicine, local heat therapy and hormone therapy; 2, non-radioactive injuries, just other non-thoracic radiotherapy combined with respiratory infections appeared to cough, at this time should be carried out anti-virus or anti-bacterial, anti-bacteria, anti-Mycoplasma anti-inflammatory treatment, at the same time, the phlegm and cough symptomatic treatment, if necessary, can be nebulized inhalation drugs. At the same time, the symptomatic treatment should be carried out to resolve phlegm and relieve cough, and if necessary, nebulized inhalation drug treatment. To summarize, the cough after radiotherapy, to actively identify the cause of the cough, according to the cause of the cough to take the appropriate treatment.