An allergy is a hypersensitivity disorder of the immune system - royaldrugstore

18 April 2014, Saint-Petersburg, (http://royaldrugstore.co/) : Allergy involves an exaggerated response of the immune system, often to common substances such as foods or pollen.

• The immune system is an intricate system that defends the body against foreign invaders, such as bacteria and viruses, while also surveying for conditions such as cancer and autoimmunity. • Allergens are substances that are foreign to the body and can cause an allergic reaction. • IgE is the allergic antibody. • Allergies can not only develop at any age, but many individuals also outgrow allergies over time. • While environment plays a role in allergy development, there is a greater risk of developing allergic conditions if a person has a family history of allergy, especially in parents or siblings.

Causes:

• It begins with exposure. Even if you've inhaled an allergen many times before with no trouble, at some point, for some reason, the body flags it as an invader. During this particular exposure, the immune system studies the allergen. It readies itself for the next exposure by developing antibodies, special cells designed to detect it. You are now "sensitized" to the allergen. • Then, the next time you're exposed to the allergen, your immune system kicks into action. The antibodies recognize it. That triggers the activation of special cells called mast cells. These cells are responsible for allergy symptoms in the lungs,skin, and lining of the nose and intestinal tract. • The mast cells burst open, flooding the system with chemicals such as histamine. These chemicals cause allergy symptoms, like swelling. Swelling in your nasal passages might cause a runny nose. Swelling in the airways could cause asthma symptoms. • Keep in mind that the amount of exposure matters. If you're allergic to strawberries, maybe eating one or two never causes any symptoms. But once you eat three or four, you may suddenly break out in hives. There's a tipping point -- or threshold -- for people with allergies. You can handle some exposure, but if it gets to be too much, the immune system is triggered to attack.

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