common
Allergies
An allergy is an exaggerated response where the body mistakenly identifies an ordinarily harmless allergen as a threat. Allergic reactions give rise to allergic diseases such as hay fever, allergic conjunctivitis, allergic asthma, atopic , food allergies, and anaphylaxis. Symptoms of allergic diseases may include red eyes, an itchy rash, sneezing, coughing, a runny nose, shortness of breath, or swelling.
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Symptoms — what it feels like
- ·Red eyes, itchy rash, vomiting, runny nose, shortness of breath, swelling, sneezing, and cough
Causes — why it happens
- · and environmental factors
Prevention
- ·Early exposure to potential allergens
Treatment
- ·Avoiding known allergens, medications, allergen immunotherapy
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See all of Immune System →Plain-language summary adapted from Wikipedia. Not medical advice.