避免和控制触发因素能减少哮喘发作、减轻症状、减少药物的需求量，因此称之为哮喘的非药物性二级预防。避免一些触发因素（如室尘螨），从长远看可以降低气道炎症和高反应性，有助于防止哮喘发展为不可逆的气流受阻。目前已知诱发哮喘急性发作的因素主要包括屋尘螨、动物的皮? Avoidance and control of triggers can reduce asthma attacks, reduce symptoms and reduce the need for medications, and are therefore called non-drug secondary prevention of asthma. Avoiding some triggers (such as house dust mites) can reduce airway inflammation and hyperalgesia in the long run and help prevent the development of asthma as irreversible airflow obstructions. Currently known factors that trigger acute exacerbation of asthma include house dust mites, animal skin?