Many of the chapters, in this volume of 16, illustrate how these three questions are inextricably linked. The chapters are divided into four sections (“The Nature of the Blush,” “Theoretical Perspectives on the Blush,” “The Blush in Social Interaction,” and “Blushing Problems: Processes and Interventions”). The first addresses how the blush arises in the vasculature of the face and how this can be measured using, for example, photoplethysmography, infrared thermography, and self- and observer questionnaires. The second addresses the affective causation of the blush, exploring it from neurodevelopmental, neuroscientific, and evolutionary perspectives. The third provides analyses of how various social situations (embarrassment, shame, shyness, or public praise) can induce blushing and how the blush serves as a signal to the beholder. The last section of the book uses specific disorders of blushing to further examine the causes of both normal and excessive blushing, as well as the treatment of it, both of which lend further insights into the three central concerns: the evolutionary, the physiological, and the psychological causes and effects of the blush.