Budesonide is a common potent glucocorticoid. Budesonide nebulization facilitates the reduction of airway inflammation, thus reducing airway secretion and stretching the airways for the purpose of resolving phlegm and cough, and is commonly used in the treatment of cough and asthma. Cough can be caused by many reasons, such as cough caused by phlegm in the throat, inhalants or infections, weather changes, and budesonide nebulization can treat common cough as well as cough caused by phlegm in the throat. The specific treatment of phlegm or cough should be used with different drugs together with budesonide in order to play a targeted role. Budesonide has a good effect on asthma and improving lung ventilation function.