Theres a lot of talk about allergies. But just what is an allergy and what causes them? Why do some people have them while others dont? And why are people with one allergy more inclined to have many?
The immune system is set up to protect our bodies from harmful, foreign substances. Like viruses and bacteria (dirt and germs). Sometimes the immune system doesnt develop properly or is just oversensitive and doesnt react right.
In these cases, it reacts to things that arent harmful and dont usually cause people any problems. These things are called allergens. The term allergens is just an easier way to say things that cause allergies.
When the oversensitive or improperly developed immune system sees these allergens, it sends out chemicals like histamine. Its the histamines that cause the symptoms that are common with allergies.
Symptoms like itching, watery eyes, runny nose, swelling, hives or rashes. Different people have different symptoms, but the causes are the same.
The symptoms that are displayed depend on the part of the body the allergen comes in contact with. Allergens that are breathed in, like pollen or dust cause coughing or wheezing,...
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