This report delves into the multifaceted realm of psychology within health and social care settings. It begins by outlining the significance of lifespan development, introducing key psychological theories such as those of Freud, Erikson, Piaget, Maslow, and Darwin, and their relevance across different life stages. The report then examines the interplay of biological and social factors that shape human behavior, emphasizing the roles of genetics, socialization, family, education, culture, and media influences. Furthermore, it underscores the importance of social roles in health and social care, highlighting their impact on well-being and the effective management of stress, mental health disorders, and behavioral changes. The report explores how psychological principles can be applied to promote positive behavioral changes and enhance understanding in health and social care practices, offering insights into the application of various psychological theories in this context.