Headache and other types of pain have some common characteristics concerning pain generation and chronicity. But some distinct pathophysiological processes are unique to the headache. This book explores pain mechanisms, diagnosis, and management of headache and other chronic pain through sessions of a joint symposium in 2012 in Hamburg, Germany, of IASP and the International Headache Society as part of the Global Year Against Headache. The goals of the meeting were to stimulate discussions about pain from different angles, establish potential cooperation and synergies between IASP and IHS, and most importantly, involve young scientists and help them build networks to advance their work. This book represents the current state of scientific discussions of the respective fields in both pain areas. It strictly follows the structure of the meeting´s topics, which were chosen based on similarity of research interest of both fields. More than 100 young scientists and clinicians from 22 countries participated, with speakers from both societies represented in all sessions.