Different causes of asthma have different symptomatic manifestations. There are physiological factors and pathologic factors that cause asthma, and pathologic factors such as bronchial asthma, chronic obstructive pulmonary disease, and acute myocardial infarction. For asthma caused by pathologic factors, timely medical attention should be sought. 1. Physiological factors: asthma caused by strenuous exercise and over-excitement, the main symptoms of shortness of breath, inter-laryngeal rales, and so on. 2. Bronchial asthma: dyspnea, rales, chest tightness, cough and other symptoms, and in severe cases, even sitting breathing, and even cyanosis. 3. Chronic obstructive pulmonary disease (COPD): cough, sputum, shortness of breath, dyspnea as the main symptoms, severe cases of wheezing, chest tightness. 4. Acute myocardial infarction: severe and persistent pressure pain in the retrosternal and precordial areas, accompanied by agitation, sweating, fear, nausea, vomiting, abdominal distension and other symptoms, and in severe cases, dyspnea, cough, cyanosis and other symptoms. There are symptoms of asthma, excluding physiological factors, should promptly seek medical attention to avoid aggravation of the condition. In addition, usually pay attention to avoid irritating gas inhalation, cold and so on, in order to prevent the trigger asthma symptoms.