This introduction provides information on health psychology theories, models, and research findings: What factors influence health (e.g., stress, resilience, social support)? How does risky behavior develop (e.g., smoking, inadequate sun protection)? How can harmful behavior be changed (e.g., prevention, relapse avoidance)? Using heart disease and cancer as examples, it demonstrates how health psychology knowledge can be applied in prevention and therapy. Health programs are critically examined. Ideal for beginners who want to learn about the topic of health psychology and its areas of application.