Coughing is worse after nebulization may be related to sputum dilution, drug allergy, too high drug concentration, etc. 1. Phlegm dilution: nebulized medicine has the effect of dissolving phlegm, after doing nebulization the sticky phlegm becomes loose and easy to cough out. At this time, coughing will be more severe, which will help to expel phlegm. Symptoms will improve after the phlegm is discharged. 2. Drug allergy: a small number of people cough too serious, may be allergic to nebulizer, patients allergic to bronchial smooth muscle spasm increased, causing severe cough symptoms. 3. High drug concentration:Part of the population undergoing nebulization may be intolerant of the drug dosing concentration, which can produce airway irritation symptoms, resulting in a more severe cough. Cough more serious after nebulization, you can reduce the number of nebulization, nebulization after gargling, drink more warm water. However, there are many reasons why the cough is worse after nebulization, and patients should go to regular hospitals for professional treatment.