What is Allergy?
Allergy, also called hypersensitivity, is a symptom of an over-sensitive or abnormal immune response to allergens - substances, often proteins, that cause an allergic reaction. These allergens are usually harmless, naturally occurring proteins and for many people they don't cause problems. For others, however, they are mistakenly considered foreign invaders by the immune system.
In the UK, 15% of people suffer from allergies and every year the incidence of allergies is increasing by five percent. Allergies can develop at any age but children are most affected by the condition.
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