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Types Of Allergic Disease. Common Allergic Diseases Include: Allergic rhinitis or hay fever.In the U.S., approximately 35 million people suffer from this disease, which is characterized by sneezing, congestion, itching and dripping of the nose and itchy, watery eyes.
Hay Fever. Hay fever is an immune disorder characterized by an allergic 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.