Allergies are unusual reactions to normally nontoxic substances. The allergens can be inhaled, swallowed or make contact with the skin. Allergens that are identified as most commonly root problems are: pollen, mold, dust, foods, animal dander, insect bites, insect spores, viruses and germs.
Normally the human body learns to protect itself though experience. That is by aggressively attacking an unknown substance that has invaded and harmed the body by producing antibodies. The best known antibody is the histamine. Sometimes the immune system incorrectly recognizes a foreign to be dangerous when it is not. This can lead to the overproduction of histamines particularly designed to destroy the exact foreign substance. If the overproduction of the histamines is large enough, the adjoining tissue is also damaged resulting in sneezing, a stifling head, sniffing, stuffed-up head, read and watery eyes or a skin irritation.
A person with allergies is loaded with an overprotective immune system and is forever on guard in opposition to everyday things that do not normally bother other people. It might be a cute loving kitten, a patch of green grass, to a slice of fresh backyard tomato. Most of the people can turn over poison ivy and come out with no any problems, while others can simply brush up against a few leaves of the stuff and there are scratching for weeks. In mainly cases, allergies are more irritating that debilitating but to the severe allergy suffers life can be pure misery or even passing away.
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