Allergy or sensitivity, (in English: allergy) is an overreaction of the immune system to various factors. Those who are allergic, the immune system invaders who apparently harmless substances found in their home, reactive than usual show.

For example pollen, the allergic person's immune system so that if the stimulation is a serious risk. Sensitivity is a common problem and almost one in ten people, two of them are affected in some way.

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