儿童哮喘的发生并非偶然的,而是多因素共同作用的结果。其中内因很难改变,是遗传因素决定。外因常常也是多源的,环境因素起到了促发的作用。哮喘是一种具有复杂性状的多基因遗传倾向疾病。其特征为:外显不全、遗传异质化、多基因遗传、协同作用。在很多哮喘儿童身上都可以体现出来,比如绝大多数哮喘儿童的家长(有血缘关系、近三代人)当中,都可 Childhood asthma is not accidental occurrence, but the result of multiple factors together. Which is difficult to change the internal causes, is determined by genetic factors. External causes are often also multi-source, environmental factors played a role in promoting. Asthma is a polygenic disorder with complex traits. Its features are: incomplete recognition, genetic heterogeneity, polygenic inheritance, synergy. In many children with asthma can be reflected in body, such as the vast majority of asthma children’s parents (kinship, nearly three generations), can be