The article discusses the relationship between social identity and health and well-being, emphasizing the importance of social identity in shaping individual psychology and influencing health outcomes. Social identity theory and self-categorisation theory are key frameworks in understanding how individuals define themselves in terms of group membership and how this affects their health and well-being. The article highlights that social identities can have both positive and negative impacts on health, depending on the context and the nature of the group membership. For example, belonging to a group that provides a sense of purpose and belonging can enhance well-being, while being part of a stigmatised or disadvantaged group can lead to negative health outcomes. The article also discusses how social identity influences symptom appraisal, health-related norms and behaviour, social support, coping mechanisms, and clinical outcomes. It argues that social identity is a central factor in health and well-being, and that understanding it can help inform health-related policies and practices. The article also highlights the importance of social identity in promoting health and well-being through group-based interventions and social support. Overall, the article underscores the significance of social identity in shaping individual and collective health and well-being, and calls for further research and application of social identity theory in health and well-being contexts.The article discusses the relationship between social identity and health and well-being, emphasizing the importance of social identity in shaping individual psychology and influencing health outcomes. Social identity theory and self-categorisation theory are key frameworks in understanding how individuals define themselves in terms of group membership and how this affects their health and well-being. The article highlights that social identities can have both positive and negative impacts on health, depending on the context and the nature of the group membership. For example, belonging to a group that provides a sense of purpose and belonging can enhance well-being, while being part of a stigmatised or disadvantaged group can lead to negative health outcomes. The article also discusses how social identity influences symptom appraisal, health-related norms and behaviour, social support, coping mechanisms, and clinical outcomes. It argues that social identity is a central factor in health and well-being, and that understanding it can help inform health-related policies and practices. The article also highlights the importance of social identity in promoting health and well-being through group-based interventions and social support. Overall, the article underscores the significance of social identity in shaping individual and collective health and well-being, and calls for further research and application of social identity theory in health and well-being contexts.