You have an allergy if certain things make you sneeze or give you an itchy rash on your skin.
There are many different causes for allergies. One person may be allergic to animals another to certain kinds of food.
Hay fever is a very common allergy and it is caused by pollen from grasses or flowers. When someone knows they have an allergy to something in particular it is best to try and avoid it. If an allergy is severe then doctors will prescribe tablets or injections to treat it.
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