Cough is a common symptom of respiratory diseases and many diseases can cause cough. In addition to cough and phlegm treatment and etiology treatment, patients with cough can also apply nebulized medications to stop the cough. Nebulization when done for cough is generally safe and has no significant side effects, but there are patients who can experience related side effects. The following side effects can be caused: 1. Stimulation of the airway when doing nebulization can cause bronchospasm and aggravation of chest tightness and shortness of breath if the patient’s airway is sensitive; 2. Nebulized drugs contain glucocorticoids and the nebulized time is long, which can cause bacterial infections such as oral candidiasis.