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The incidence of asthma complicated reasons, but mainly include two aspects, namely, asthma patients with physical and environmental factors. Patient's physical, including "genetic predisposition", immune status, psychological status, health status and other endocrine and subjective conditions is that the patient susceptible to asthma, an important factor. Environmental factors including allergens, irritant gases, viral infections, living area, room conditions, occupational factors, climate, drugs, exercise (hyperventilation), food and food additives, dietary habits, social factors and even economic conditions of staff may be led to the development of asthma is more important reasons.
Allergy-induced asthma, a group originally an important cause. Main points of inhaled allergens and food allergens allergens. Inhaled allergens mainly come from the living environment containing allergens of particulate matter, its allergenic components are mainly proteins and polysaccharides. Allergens invade the body can determine the way to lesions of the organ, due to air-borne particles can draw at any time in their lives and exists, is usually caused by inhalation of respiratory allergens and asthma attacks for children a major way.
Inhaled allergens in a wide range of major sub-indoor allergens and outdoor allergens. Indoor allergens, including room dust, dust mites, fungi and cockroaches, are the main reason for childhood asthma; outdoor allergens include pollen and fungus, due to fewer children, outdoor activities, outdoor allergens is relatively less important.
At present, most authors believe should be divided into the many factors that lead to asthma risk factors (Trigger)? And predisposing factors (Contributor) two categories (see extended reading 2), risk factors refer to the first attack of asthma factor is the onset of asthma "trigger" and the main cause of asthma in terms of both the occurrence and development play an important role; inducing factor is that the patient had been suffering from asthma on the basis of renewed activity-induced asthma or asthma hidden acute factor was having an asthma attack in the process of synthesis induced by one of the factors in causing asthma relapse and further development of the situation play an important role. In these two categories of factors, some factors such as allergens, irritant gases and harmful gases, occupational factors, viruses, food, and the dual role of both drugs not only can lead to the occurrence of asthma, but also the situation in the asthma the development process play an important role. However, we should be clear to all of the environmental factors of asthma is to determine whether there was not the only factor, its own asthma atopic quality is also very important.
Regional differences in the incidence of asthma with greater prevalence rate of around about 1% ~ 13%, and China in recent years, Shanghai, Guangzhou, Xi'an and other places the results of a sample survey, the prevalence of asthma is about 1% ~ 5%. The information in five cities from 13 to 14-year-olds the incidence of asthma was 3 ~ 5%, while the adult prevalence rate of about 1%. Roughly the same prevalence rate for men and women, about 40% of patients have a family history. Developed than developing countries, in urban than in rural areas.

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