Nebulization with saline only is equal to not using any drugs, itself if there is no disease, nebulized saline is not harmful, mainly some patients with chronic obstructive pulmonary or asthma, need nebulized drugs, only nebulized saline, without drugs, the actual is no treatment for patients, because there is no treatment with drugs, will bring the corresponding harm. Therefore, it is important to distinguish between cases in which saline nebulization can be used and cases in which it cannot be used. In the case of patients with severe lung disease, you cannot simply nebulize saline only, there may be some more serious hazards that lead to the patient not being treated, resulting in aggravation of the condition.