An allergy is a reaction of your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing.
An allergy can be caused by exposure to anything and everything under the sun, including the sun. For example, pollen in the air can cause allergy and result in a runny nose. Excess sunlight may cause allergic reactions of the skin. One important fact to note here is that a substance causes allergy in only some individuals. Thus, what determines if a person is likely to suffer from allergies is not only the allergen but the way the immune system deals with the external substance. Hereditary or genetic factors play an important role in determining if a person is likely to be allergic or not.
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