Allergy

The bodies defence mechanism works over time to react against foreign particles which may pose danger to normal functioning of the human system. These foreign particles are known as Allergens.

People who are known to be allergic, respond to harmless allergens in an exaggerated manner thus resulting in irritations and discomfort to the body.There are several types of allergies like: Hay Fever, Asthma, Eczema, Hives, Contact Dermatitis (Skin Reactions), Conjunctivitis (Red eye), Sinusitis, Anaphylaxis (Life-Threatening Reaction).

For this general concept of the changed capacity for reaction, I propose the term "allergy". "Allo" denotes the deviation from the original state, from the behavior of the normal, as in "allorhythmia","allotropy". - Clemens Peter Pirquet von Cesenatico, 1906