Allergic rhinitis

Posted by e-Medical PPT Friday, July 9, 2010
Allergic rhinitis or hay fever is an allergic inflammation of the nasal mucosa. It occurs when an allergen such as pollen or dust is inhaled by an individual with a sensitized immune system, and triggers antibody production. The antibodies mostly bind to mast cells, which contain histamine. When the mast cells are stimulated by pollen and dust, histamine released. This causes itching, swelling, and mucus production.Characteristic physical findings in individuals who have allergic rhinitis include conjunctival swelling and erythema, eyelid swelling, lower eyelid venous stasis, lateral crease on the nose, swollen nasal turbinates, and middle ear effusion.Some disorders may be associated with allergies: Comorbidities include eczema, asthma, depression and migraine.Allergies are common. Heredity and environmental exposures may contribute to a predisposition to allergies.Allergic rhinitis triggered by the pollens of specific seasonal plants is commonly known as "hay fever", because it is most prevalent during haying season.
Allergy testing may reveal the specific allergens an individual is sensitive to. Skin testing is the most common method of allergy testing. This may include intradermal, scratch, patch, or other tests.

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