The word allergy springs from the Greek phrases “allos,” which means diverse or changed and also “ergos,” meaning work or perhaps actions. Allergy roughly refers to an “altered reaction.” An allergic reaction refers to the high response by your immune system in reaction to actual contact with certain foreign materials. Allergic people’s systems acknowledge the foreign material and one particular section of the immune system is switched on. Allergy-producing substances are known as “allergens.” Types of allergens comprise of pollens, dust mite, molds, danders, and food items. For you to grasp the language of allergy it is important to remember which allergens are substances that are unusual to your system and can result in an hypersensitive reaction in certain persons.