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An allergy is an abnormal reaction to ordinarily harmless substance or substances. These sensitizing
substances, called allergens, may come into contact with the nose, the eyes, and the lung, causing typical allergic symptoms
like allergic rhinitis (hay fever with running & itchy nose), allergic conjunctivitis (runny & itchy eyes), and asthma
(cough, wheezing, and shortness of breath) respectively .
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