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Allergy is caused by an oversensitive immune system, which leads to a misdirected immune response. The immune system normally protects the body against harmful substances, such as bacteria and viruses. In contrast, an allergic reaction is when ...
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www.nlm.nih.gov/medlineplus/ency/article/000812.htm#Cau...
www.nlm.nih.gov/medlineplus/ency/article/000812.htm#Causes,%20incidence,%20and%20risk%20factors
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Causes Return to top ... The best "treatment" is to avoid what causes your allergic symptoms in the first place. It may be impossible to completely avoid all allergens to which you ... However, as a general rule, once a substance causes allergies for an individual, it can continue to affect the person over the long term.
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www.nlm.nih.gov/medlineplus/ency/article/000813.htm
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About 40% of us suffer from some form of allergies. And they're particularly bad during spring and fall, when pollens and molds are high. But allergies aren't just about a runny nose and scratchy throat. In fact, allergies are caused by a r...
http://adam.about.com/b/2004/08/30/what-causes-allergie...
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BackupMD - How allergies work and what causes them. ... Histamine lowers the local blood pressure and causes itching and swelling . It can also cause wheezing, an itchy, runny nose, nausea, vomiting or diarrhea. That is why "anti- histamine" drugs are used to treat allergies.
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www.wdxcyber.com/ngen28.htm
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Your body's overreaction to the allergens is what causes symptoms (see the box below for a list of symptoms). For example, sometimes the term "hay fever" is used to describe your body's allergic reaction to seasonal allergens in the air, such as grass or pollen. ... What causes allergies?
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familydoctor.org/online/famdocen/home/common/allergies/...
familydoctor.org/online/famdocen/home/common/allergies/basics/083.html
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Allergies are the result of a faulty immune system that mistakenly identifies certain proteins found in innocuous substances as harmful invaders. In response to exposure to these proteins, the body's immune system produces its own proteins,...
http://www.ehow.com/about_5098813_causes-nasal-congesti...
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Allergies are the result of a hypersensitive immune system. The allergic immune system misidentifies an otherwise innocuous substance as harmful, and then attacks the substance with a ferocity far greater than required. ... What causes allergic reactions?
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www.howstuffworks.com/allergy.htm
www.howstuffworks.com/allergy.htm
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Seasonal allergies, or "allergic rhinitis,"are triggered by "allergens"--substances that trigger reactions in the body. Pollens or molds are among the most common allergens, according to the American Academy of Allergy, ...
http://pregnancy.about.com/cs/healthduringpreg/a/aaseas...
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