Allergic rhinitis is sometimes called “hay fever” or “seasonal allergies,” although it can be caused by nonseasonal substances as well. Allergic rhinitis refers to inflammation in the nose (rhinitis) that occurs when you are exposed to a substance you are allergic to. The term “allergic rhinitis” does not refer to all kinds of allergies you may have. For example, food allergies and allergies to medications do not typically cause allergic rhinitis.