Asthma, or bronchial asthma, is a respiratory disease characterized by chronic airway inflammation and airway hyperresponsiveness, usually manifested by recurrent episodes of wheezing, shortness of breath, chest tightness, or coughing, etc. Heredity and the environment are the main factors leading to the development of asthma. Typical symptoms of asthma are episodes of expiratory dyspnea with rales, which may be accompanied by shortness of breath, chest tightness or cough. There are also special types of asthma in which coughing or chest tightness is the only symptom, and the episodes are often exacerbated or worsened at night and in the early morning. It may be relieved by medication or resolve on its own. The causes of asthma: 1. Genetic factors: asthma is a complex, polygenic genetic predisposition of the disease, its onset of family clustering phenomenon, the closer the kinship, the higher the prevalence. 2. Environmental factors: including allergenic factors, such as dust mites, pollen, paint, certain foods (fish, shrimp, eggs), certain drugs such as aspirin, etc.; but also non-allergenic factors, such as atmospheric pollution, smoking, exercise and so on. If there are episodes of wheezing, coughing, chest tightness and other symptoms need to be alert to the possibility of asthma, we should go to the regular hospital in a timely manner to determine the cause of the disease, and give reasonable treatment.