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Rhinitis
Rhinitis refers to inflammation of the nasal passages. It can be caused by a respiratory infection (cold or flu), allergies, or contact with a medication.

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Allergies (Seasonal and Perennial Allergic Rhinitis)

Allergies are an exaggerated immune reaction to normally harmless substances known as allergens. When a susceptible person is first exposed to an allergen, an immune response is activated. Later re-exposure may result in the release of substances, including histamine, triggering a range of reactions.
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