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Allergic rhinitis, also known as hay fever, is a type of
inflammation in the nose which occurs when the immune system overreacts
to allergens in the air. Signs and symptoms include a runny or stuffy nose,
sneezing, red, itchy, and watery eyes, and swelling around the eyes. The fluid
from the nose is usually clear. Symptom onset is often within minutes
following allergen exposure and can affect sleep, and the ability to work or
study.