Allergies are among the most common chronic conditions worldwide.
According to the leading experts in allergy research, an allergic reaction begins in the immune system. The immune system overreacts to the allergen by producing Immunoglobulin E (IgE) antibodies. These antibodies travel to cells that release histamine and other chemicals, causing an allergic reaction.
An allergic reaction typically triggers symptoms in the nose, lungs, throat, sinuses, ears, lining of the stomach, or on the skin. For some people, allergies can also trigger asthma symptoms. In serious cases, a life-threatening reaction called anaphylaxis can occur.
A number of different allergens are responsible for allergic reactions. The most common include: