What are allergies? What is an allergy?

Allergies are hypersensitive immune responses to substances that either enter or come in contact with the body, such as pet dander, pollen or bee venom. A substance that causes an allergic reaction is called an "allergen". Allergens can be found in food, drinks or the environment. Most allergens are harmless, i.e. the majority of people are not affected by them. If you are allergic to a substance, such as pollen, your immune system reacts to it as if it were a pathogen (a foreign harmful substance), and tries to destroy it. Allergies are very common...

Source: http://feedproxy.google.com/~r/mnt/healthnews/~3/RnnkVuH85sw/264419.php

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