Allergies

An allergy is a hypersensitivity disorder of the immune system. Allergic reactions occur when a person's immune system reacts to normally harmless substances in the environment. A substance that causes a reaction is called an allergen. 

These reactions are acquired, predictable, and rapid. Allergy is one of four forms of hypersensitivity and is formally called type I (or immediate) hypersensitivity.

 Allergic reactions are distinctive because of excessive activation of certain white blood cells called mast cells and basophils by a type of antibody called Immunoglobulin E (IgE). This reaction results in aninflammatory response which can range from uncomfortable to dangerous.

Following are the article about Allergies..there causes and symptoms:-

• Allergy Causes & Symptoms
• Do You Have Food Allergies
• Peanut Allergy, How Dangerous It Is?
• Allergy and Allergy Treatments for Relief
• Best Seasonal Allergy Treatments that you can Explore
• Allergies Symptoms and Natural Foods That Fight Allergies

• 10 Tips on Avoiding and Responding Properly to Seasonal Allergy