Allergic Rhinitis Causes
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This area has swelling and increased mucus production after contact with an allergen.
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Causes of Allergic Rhinitis
An allergic reaction occurs when your body's immune system overreacts to an allergen. When you breathe in an allergen, cells in your nasal passages make a chemical called histamine. Histamine causes your nose to feel itchy and also causes swelling and mucus production in the nasal passages.
This area has swelling and increased mucus production after contact with an allergen.
© 2009 Nucleus Medical Media, Inc.
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