Book excerpt: As our understanding of what constitutes ‘good health’ grows, so does our need to understand the psychological aspects of medicine and health, as well as the psychological interventions available in healthcare. This new edition of this bestselling textbook provides a comprehensive overview of the research, theory, application and current practices in the field, covering topics from epigenetics to social determinants of health and transdiagnostic approaches to mental health and everything in between. An essential read for all medicine and healthcare students, this text is now accompanied by a suite of online resources for all your learning needs.