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OverviewSeasonal allergic rhinitis (SAR), also known as hay fever, is an allergic reaction in the upper airways that occurs when sensitized individuals encounter airborne allergens (typically tree, grass, and weed pollens and some molds). Although pollen seasons vary across the United States, generally, tree pollens emerge in the spring, grass pollens in the summer, and weed pollens in the fall. Outdoor molds generally are prevalent in the summer and fall. SAR is distinguished from perennial allergic rhinitis (PAR), which is triggered by continuous exposure to house dust mites, animal dander, and other allergens generally found in an individual Full Product DetailsAuthor: Agency for Healthcare Resea And Quality , U S Department of Healt Human ServicesPublisher: Createspace Independent Publishing Platform Imprint: Createspace Independent Publishing Platform Dimensions: Width: 21.60cm , Height: 2.00cm , Length: 27.90cm Weight: 0.866kg ISBN: 9781492252399ISBN 10: 1492252395 Pages: 374 Publication Date: 25 August 2013 Audience: General/trade , General Format: Paperback Publisher's Status: Active Availability: Temporarily unavailable ![]() The supplier advises that this item is temporarily unavailable. It will be ordered for you and placed on backorder. Once it does come back in stock, we will ship it out to you. Table of ContentsReviewsAuthor InformationTab Content 6Author Website:Countries AvailableAll regions |