The concept of identity is crucial in understanding the existence of a person. In the context of health and social care, psychological theories help develop an understanding of the sense of identity needed by service users. While the principle of identity may not be effective in stimulating behaviour change in service users, it can be applied to improve communication with them and facilitate advocacy and intervention planning. Additionally, psychological theories such as group decision-making and social identity theory can enhance cognitive performance among care residents. Overall, psychology plays a vital role in health care, particularly in understanding the complex relationships between social ties, support, and physical and mental health.