The prevalence of allergic diseases is increasing sharply in both developed and developing countries. These diseases include: asthma; rhinitis; anaphylaxis; drug, food, and insect allergy; eczema; and urticaria (hives) and angioedema. Allergic asthma and rhino-conjunctivitis are the most common. Asthma incidence is rising, affecting some 300 million people worldwide. Allergic rhinitis (AR) affects an estimated 10-30% of the world’s population, with prevalence rates also increasing worldwide. Dr Juan Gispert, Senior Medical Director and Head of Quintiles’ Allergy and Respiratory Center of Excellence, provides an overview of allergy therapies.