Allergies, 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 or no problems to most people. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma and anaphylaxis. Symptoms may include red eyes, an itchy rash, sneezing and a runny nose, shortness of breath or swelling. Food intolerances and food poisoning are separate conditions.
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