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Asthma is not infectious disease, will not be infected. But prone to heredity, such as parents being the anaphylactic physique, suffer from asthma, the probability that its child suffers from asthma will be slightly high. Forming and outbreak of asthma are not only relate to inherent cause but also influenced by environmental factor. A lot of survey materials indicate, patient's relative's morbidity of asthma is higher than colony's morbidity, and the nearer the blood reason relation is, the higher the morbidity is; In a family, the more ill number of people is, the higher its relative's morbidity is; The more serious patient's condition is, the higher its relative's morbidity is. The environmental factor influences asthma mainly including can suck aninals or plants' anaphylactogen to contact ( abnormally and originally)ing, air pollution, especially the virus and mycoplasma are infected in the airway infection, sports and excessively keeping in touch with, the weather changes, some food and food additive, the medicine and spiritual factor of the nerve include being excited, frightened. On the basis of inherent cause, a kind of environmental factor can bring out and can inspire asthma. In various environmental factors of inspiring the asthma, the allergic factor is the most common and important. Among them the indoor anaphylactogen is room dust mite, cockroach, other insects, mould,etc. commonly; The outdoor anaphylactogen is often pollen, globefish grass and mould,etc.. The albumen compositions in some food such as milk, eggs, fish, shrimp, crab,etc. can also be regarded as the anaphylactogen and brought out asthma.
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