Hay fever, also known as allergic rhinitis, is the condition responsible for seasonal allergies or allergic reactions to other environmental allergens, like dust mites and animal dander. Estimates vary, but somewhere around 10–30% of the population worldwide experiences hay fever at least occasionally. Symptoms include nasal congestion, headaches, itchy throat and ocular symptoms, like itchy eyes, tearing and redness. Ultimately, these symptoms disrupt daily activities and affect quality of life for hay fever sufferers.



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