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Allergy is a condition where your body reacts adversely to some common substances when come in contact with them. Those are called allergens. Some common allergens are dust mites, pollens, animal danders, some chemicals like sulphur, tetrazine, some foods like egg, shell fish, mango, strawberries, milk, meat, soy, some drugs like pencilin, tetracycline etc. If those allergens gives reaction on skin then it swelled up like a patch and that itches. This is called urticaria. If those allergens react to your nasal surface that causes recurrent itching. If those allergens react to your respiratory tract then causes bronchial asthma. If those substance react to your eyes causes redness, itching and swelling of eyes.
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