Hay fever, also called allergic rhinitis, causes cold-like signs and symptoms such as a runny nose, congestion, sneezing and sinus pressure. But unlike a cold, hay fever isn't caused by a virus. Hay fever is caused by an allergic response to outdoor or indoor allergens, such as pollen, dust mites or pet dander. Hay fever is common — it affects more than 1 in 5 people. Some people have symptoms year-round. For others, hay fever symptoms get worse at certain times of the year, usually in the spring, summer or fall.

Hay fever can make you miserable and affect your performance at work or school, and interfere with leisure activities. But you don't have to put up with annoying symptoms. Learning how to avoid triggers and finding the right treatment can make a big difference.

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