Hay fever, also called allergic rhinitis, causes cold-like symptoms such as a runny nose, congestion, sneezing and sinus pressure. But unlike a common cold, which is caused by a virus, hay fever is an allergic response to indoor or outdoor airborne allergens, such as pollen, dust mites or pet dander. Some individuals have hay fever year-round. Others have episodes of hay fever at certain times of the year, usually in the spring, summer or fall.
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