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Seasonal allergic rhinitis affects the body's immune system by causing it to react to harmless allergens as threatening invaders. White blood cell levels will usually increase in response to the allergen, and these cells trigger the release of histamine. Histamine then affects other parts of your body by causing symptoms like congestion, headache, itchy throat and eyes, and a runny nose.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.