General purpose of this article paper is to discuss on some problems happens during an Allergic Reaction. Allergies may happen under various conditions. Its symptoms are sometimes similar to a different sort of allergy. Sneezing, red eyes and itchy red-colored marks are some similar symptoms of a number of allergy. According to a number of researches, for you to be aware of what happens during sensitized reaction, you must initial identify the peripheral broker that causing the hypersensitivity.