Almost 8 percent of adults in the United States also suffer from allergic rhinitis … Hay fever can … Pollen is the most common allergen in seasonal allergic rhinitis. Allergic rhinitis is an inflammatory procedure of the nasal mucosa due to the impact of an external irritant – an irritant (dust, pollen, frost, etc.). Pollen, pet dander, mold and insects can lead to hay fever symptoms. Allergic rhinitis, also called hay fever, is an allergic reaction that causes sneezing, congestion, itchy nose and sore throat. Signs and symptoms include a runny or stuffy nose, … Allergic rhinitis, also known as hay fever, is a type of inflammation in the nose which occurs when the immune system overreacts to allergens in the air. Hay fever is caused by an allergic … What Causes Hay Fever? Allergens are harmless substances that cause an allergic reaction, as in the case of allergic rhinitis or hay fever which is an allergic reaction to a specific allergen. But unlike a cold, hay fever isn't caused by a virus. If you suffer from hay fever (allergic rhinitis), it's because your immune system views harmless inhaled pollen or other allergens as dangerous substances invading the body. Allergic rhinitis might appear like this: Mucus appears in … Hay fever, also called allergic rhinitis, causes cold-like signs and symptoms, such as a runny nose, itchy eyes, congestion, sneezing and sinus pressure.