Allergies and allergic reactions are caused when the body’s immune system reacts to external stimuli that manifest in physical response. Millions of people suffer from allergies which can range from mild symptoms to severely debilitating reactions. There are numerous causes that can be from one’s environment that range from food, pollen, chemicals, and a host of substances. Because there are so many potential allergens and ones that may even be unknown to cause symptoms, allergy testing can be performed evaluate and discover the various causes. Testing cannot only demonstrate what you are allergic to but inform you of allergens in your environment and geographic location.