What are allergies

An allergy is an overreaction of the defense system of the organism to various environmental factors. These factors are called antigens or allergens.
When any allergen comes into contact with the body, the body defends itself by producing  protective antibody immunoglobulin E (IgE). This protein is located in the body of every human being, but in small quantities, while in people who suffer from allergies there are many more. IgE is specific for each allergen, which is why are all allergies specific.

In some people,  defense system overreacts to antigenic stimuli, and antibodies to fight the antigens leads to allergic inflammation.
Such turbulent defensive reaction produces  inflammation, which  destroys the tissue, rather than to defend the body. The result of this reaction are the symptoms of allergies – locally occurring redness, swelling and itching. These symptoms can recognize as signs, eg. A cold and that’s because it’s the same defense mechanism except that this time the reaction is violent and not useful – in fact it’s not the harmful substances.

Allergies usually occur between 25 and 34 years. The men threatened earlier, at age 15, while women are equally exposed to all ages.
It has been shown that allergies often occur in families with a positive history of allergic diseases, but can`t inherit the defined allergies, but the tendency that the immune system reacts violently to antigens. If both parents are allergic, the likelihood that a child will be allergic is 75%. The child will be prone to allergies if the mother is allergic.

Image source:http://www.weather.com/health/allergy/news/reduce-allergy-risks-20120417

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