Allergies are reactions caused by the immune system as it responds to environmental substances that are usually harmless to most people. They may occur in response to a range of different material (called allergens), such as food, pollen, dust mites, animals, insect stings, or medicines. An allergy can affect different parts of the body. Allergic ...
What are allergies and why are we getting more of them?
By Adam Collison, Ellizabeth Percival, Joerg Mattes, Rani Bhatia
21 Oct 2015