There are many reasons for the development of asthma: genetic factors and environmental factors. Environmental factors include climate change, immune abnormalities, respiratory infections, exposure to allergies, dusty environments, smoking, etc. Allergens such as pollen, mites, animal fur, food allergens, etc. can trigger asthma, as can medications such as aspirin. In addition, mental factors can also cause asthma, usually pay attention to keep warm and avoid allergen contact to avoid attacks. 1, genetic factors is bronchial asthma has a familial genetic tendency, is the case can lead to asthma attacks. 2, epidemic abnormalities is the body Th1, Th2 cell balance broken ring, is also the cause of asthma. 3, climate change, if the climate changes suddenly, inhalation of cold air is also caused by the onset of asthma. 4.Respiratory tract infection can also induce asthma and requires special attention. 5, exposure to allergens is the most common cause of asthma attacks. For example, asthma attacks are likely to occur in spring or autumn when pollen concentrations are high, and this asthma is generally seasonal. There are also dust mites, household pet dander, cockroaches, and dust are also triggers of asthma. Particulate matter and chemicals in the atmosphere may also trigger an asthma attack. Most of the symptoms of asthma are sudden attacks of dyspnea at night, which can be quickly relieved by inhaling salbutamol aerosol immediately. Asthma is a common respiratory disease, characterized by characteristic respiratory symptoms and changes in lung function consistent with asthma. Asthma is a chronic inflammatory disease of the airways and is a common respiratory disease.