Living with Allergies Make an Appointment Ask a Question Find a Doctor When you have allergies, your immune system reacts to a foreign substance (an allergen) as if it were dangerous, even though it is harmless to others. A doctor uses clinical and family histories, physical examination, and skin and laboratory tests to diagnosis allergic disease and identify potential allergic triggers. Allergy symptoms can be successfully relieved through a combination of allergen avoidance, allergy medications and immunotherapy. The best way to manage allergies is to learn about your allergens and triggers, avoid allergens and take your medication appropriately. For example, if you have pollen allergies, learn when pollen season starts in your area and take allergy medications before allergy symptoms start. Featured Stories Allergy Medication: FAQ Animal Allergy: FAQ How To Avoid Nighttime Allergies and Sleep Better Nasal Wash Guide A nasal wash is a way to clean the nasal passages and sinus cavities. It's a simple procedure that most people, even children, can do easily. View Nasal Wash Infographic Nasal Wash Directions & Videos Allergy Treatment Programs No matter where you are on the allergy spectrum, get care from the international leader in allergy research and treatment, National Jewish Health. Learn more. 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