Two factors come into play with all allergic reactions. These are the allergen and the person who is sensitive to it. An allergen is any substance that causes an allergic reaction in an individual. To understand some of the common causes of allergic reactions, a little simple science is all that is needed.

Every year, it is estimated that over fifty million Americans are affected with some type of allergy. Many of these hypersensitive reactions, such as mild seasonal hay fever can be handled with over-the-counter drugs or with no treatment at all. On the other hand, some allergies can have a big effect on your life and in some cases, even become life threatening. If this is the case, you should see a doctor for a complete review and allergy testing.