Allergy is an immune system reaction to normally harmless substances that we commonly encounter in our lives. It is caused by incorrect activation of immunoglobulin E antibodies due to the allergen. The spectrum of allergic reactions is very wide, from mild rhinitis to anaphylactic shock, which can be life-threatening. Typical symptoms of an allergic reaction are swelling of the nasal mucosa, cold, redness, itching and swelling around the eyes, narrowing of the trachea, emphysema, shortness of breath and respiratory failure, eczema and hives.

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