An allergist is a physician who specializes in diagnosing and treating allergy-related symptoms to identify triggers for allergic reactions and allergy diseases such as asthma. They are often sought out to treat and prevent allergic reactions, whether that treatment is through identifying the allergy triggers so that the patient can know what to avoid, or providing immunology for allergens that are unavoidable, like seasonal allergies. The allergist will likely want to perform one or more allergy tests to accurately identify allergens according to the experienced symptoms provided by a patient to determine the best course of action for treatment to prevent future allergic reactions from occurring. Allergists are experts in the immune system, allergy diseases, and asthma.