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What is hay fever?

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Hay fever, or allergic rhinitis, affects over 40 million people. Learn more about the symptoms, causes and treatments for hay fever. read more

Hay fever is an allergic disorder characterized by an exaggerated immune response to pollen grains and other substances. Also known as allergic rhinitis, there are two types: seasonal, which occurs only during the time of year in which certain plants pollinate, and perennial, which occurs all year round. read more

Hay fever, also called allergic rhinitis, causes cold-like signs and symptoms, such as a runny nose, itchy eyes, congestion, sneezing and sinus pressure. But unlike a cold, hay fever isn't caused by a virus. read more

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