An allergen is an otherwise harmless substance that causes an allergic reactionallergic rhinitis or hay fever is an allergic response to specific allergens pollen is the most common allergen . Allergic rhinitis is a diagnosis associated with a group of symptoms affecting the nose these symptoms occur when you breathe in something you are allergic to such as dust animal dander or pollen. What is hay fever hay fever is an allergic disorder characterized by an exaggerated immune response to pollen grains and other substances also known as allergic rhinitis there are two types . Allergic rhinitis commonly known as hay fever is a group of symptoms affecting the nose but dont be misled by the name you dont have to be exposed to hay to have symptoms
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