Asthma attacks are often accompanied by coughing sputum, such as coughing sputum when secondary infection occurs, or even the formation of sputum plugs, blocking the airway and aggravating the performance of hypoxia in asthma patients, so in clinical treatment to release airway spasm and eliminate airway inflammation, expectorant drugs can be used to assist in the treatment of asthma, which is a symptomatic treatment for wheezing and coughing sputum, and does not apply to asthma etiological treatment measures, which should be brought to the attention of asthma patients. It should not be inferred from the phenomenon that shortness of breath and dyspnea are relieved after some patients cough up a lot of foamy sputum or thick sputum that coughing and wheezing can be improved if the sputum is dissolved. Irrational application of expectorants may lead to dilution of airway secretions, blockage of airway by large amount of mucus and stimulation of airway to produce more secretions. Therefore, the process of asthma treatment should be based on the specific condition of the disease, and expectorant drugs should not be used easily, but should be based on the specific condition. Lin Yong, Department of Respiratory Medicine, Nanjing Chest Hospital