When someone is exposed to an allergen a substance to which their body is sensitive they may produce histamines, which cause inflammation and irritation as they work to rid the body of the allergen. In the case of allergy induced asthma, the histamines go to work on the bronchial passages and lungs, making it difficult for the allergic person to breathe.
The incidence of allergy induced asthma has grown almost geometrically in recent years, and scientists arent quite sure why. They suspect that part of the reason may be the increased exposure of children to some common allergens. This seems to be borne out by population based studies African-American and Hispanic children living in the inner city are far more likely to develop allergy induced asthma than Caucasian children in the same cities, and even those children are more likely to develop allergy induced asthma than suburban and rural children of the same socioeconomic level.
A number of reasons have been advanced for the disparity, but the most likely is simply that Black and Hispanic children are far more likely to live in the most crowded old neighborhoods of the city. Crowding is the biggest risk factor...
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