Our expert says:
It is often hereditary or genetic. You have to be exposed to an allergen in order to develop an allergy. The more intense and repetitive the exposure to an allergen and the earlier in life it occurs, the more likely it is that an allergy will develop. Other important influences that may conspire to cause allergic conditions are smoking, pollution, infection, and hormones. Allergic people have an overactive response to certain allergens because they make more Immunoglobulin E.
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