Asthma that is, bronchial asthma, current research believes that the onset of bronchial asthma and genetic and environmental factors have a significant correlation. 1. Heredity: Asthma is a complex disease with polygenic genetic predisposition, and its onset is characterized by the phenomenon of family clustering, with a higher prevalence of asthma the closer the kinship relationship. Genome-wide association studies have identified a number of asthma susceptibility genes, such as YLK40, IL6R, PDE4D and L33. However, the prevalence of asthma in people with asthma susceptibility genes is strongly influenced by environmental factors. 2. Environment: including allergenic factors, such as indoor allergens (dust mites, domestic pets, cockroaches), outdoor allergens (pollen, grass pollen), occupational allergens (paints, reactive dyes), food (fish, shrimp, eggs, milk), medications (fish, shrimp, eggs), and other allergens. Milk), drugs (aspirin, antibiotics) and non-allergic factors such as air pollution, smoking. Exercise and obesity can trigger asthma. In addition to genetic and environmental causes, there are many other triggers that can trigger asthma, such as: sudden climatic changes, strenuous exercise, respiratory infections, and psychosomatic.