The most common symptoms of an asthma attack are coughing, wheezing, chest tightness, breath-holding, or a squeaky string-pulling sound in the throat when wheezing; this is wheezing. These symptoms usually occur at night, after exercise, after strenuous activity, and when you are emotionally upset, i.e., when you are anxious and angry, or when a child is crying and laughing. In addition, it is necessary to identify whether there are other symptoms accompanying fever, rhinitis, etc. It is recommended to go to the hospital and determine whether the symptoms of coughing, wheezing, chest tightness and breath-holding are caused by an asthma attack or something else by pulmonary function tests. The hospital mainly performs pulmonary function tests, and the patient undergoes nebulization followed by a pulmonary function test called a bronchodilator test. The bronchodilator test determines whether these symptoms are reversible or irreversible airway obstruction, and thus determines whether the asthma attack or bronchial inflammation is caused by an infection or allergy.