This report delves into the application of psychology within health and social care settings. It begins by comparing various psychological theories of lifespan development, including Erikson's stages of psychosocial development and Freud's psychosexual stages, and then explores how these theories relate to specific life stages. The report then examines the influence of both social and biological factors on human behavior and analyzes the importance of social roles within health and social care environments. Furthermore, it analyzes how psychological theories inform the understanding of behavior disturbance and mental health disorders, as well as how psychological principles can be applied to effect behavior change. Finally, it explores how psychological theories can enhance the understanding of relationships in health and social care. The report concludes with an overview of the key findings and their implications for practice.