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The next lesson in allergy information is to understand what happens when an allergic reaction takes place. If a person with a hyper-alert immune system is exposed to an allergen, his/her body starts producing an antibody, called IgE, to fight the allergen.
The antibodies attach to a form of blood cell called a mast cell.

There are numerous mast cells in the airways and in the GI tract where allergens tend to enter the body. The mast cells explode and release a variety of chemicals including histamine, causing most of the symptoms of an allergy.

If the allergens are airborne, the reaction is likely to occur in the eyes, nose and lungs.

If the allergens are ingested, the reaction mostly occurs in the mouth, stomach and intestines. Sometimes the mast cells release sufficient chemicals causing a reaction throughout the body, such as hives, decreased blood pressure, shock, or loss of consciousness.

Next lesson in allergy information is to be familiar with the nature and categories of the symptoms. Allergy symptoms can be classified into mild, moderate, or severe (anaphylactic) categories. Mild symptoms are those that affect a specific area of the body such as rash, itchy, watery eyes, and some congestion.

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Read more here …… Allergy Information