why allergy happens?? explain briefly.
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Allergy occurs when a person reacts to substances in the environment that are harmless to most people. These substances are known as allergens and are found in dust mites, pets, pollen, insects, ticks, moulds, foods and some medications. Atopy is the genetic tendency to develop allergic diseases. hope it helps u
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It happens if u have a allergy to something.
It may be because u may have experienced it before, or u hate that particular things or it could even be lifestyle.
Eg: If u are allergic to seafood, you will have to avoid it.
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