This report delves into the application of psychology within health and social care, exploring the impact of psychological factors on human behavior. It begins by comparing different theories of lifespan development, such as stage theories and open-ended theories, and relates them to various life stages, including infancy, childhood, adolescence, and adulthood. The report then examines social and biological factors, like family, culture, genetics, and social exclusion, influencing behavior, using a case study of a patient with Alzheimer's. Furthermore, the importance of social roles, such as managers, care workers, and family members, in healthcare settings is analyzed. The report also addresses the application of psychological theories to understand mental disorders and promote behavior change, and it concludes by highlighting the role of psychological theories in understanding relationships. The report provides a comprehensive overview of the key psychological concepts and their practical applications in the context of health and social care, including discussions on psycho-dynamic, behavioral, cognitive, and humanistic perspectives.