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Allergy, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes little problem in most people. These diseases include hay feverfood allergiesatopic dermatitisallergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, runny noseshortness of breath, or swelling. Food intolerances and food poisoning are separate conditions.

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