The social environment comprising communities, families, neighbourhoods, work teams, and various other forms of social group is not simply an external feature of the world that provides a context for individual behaviour. Instead these groups impact on the psychology of individuals through their capacity to be internalised as part of a person's social identity. If groups provide individuals with a sense of meaning, purpose, and belonging (i.e. a positive sense of social identity) they tend to have positive psychological consequences. The impact of these identity processes on health and well-being is explored in the contributions to this special issue. In this editorial, we discuss these contributions in light of five central themes that have emerged from research to date. These themes address the relationship between social identity and (a) symptom appraisal and response, (b) health-related norms and behaviour, (c) social support, (d) coping, and (e) clinical outcomes. The special issue as a whole points to the capacity for a social identity approach to enrich academic understanding in these areas and to play a key role in shaping health-related policy and practice.

A survey study of patients recovering from stroke (N = 53) examined the extent to which belonging to multiple groups prior to stroke and the maintenance of those group memberships (as measured by the Exeter Identity Transitions Scales, EXITS) predicted well-being after stroke. Results of correlation analysis showed that life satisfaction was associated both with multiple group memberships prior to stroke and with the maintenance of group memberships. Path analysis indicated that belonging to multiple groups was associated with maintained well-being because there was a greater likelihood that some of those memberships would be preserved after stroke-related life transition. Furthermore, it was found that cognitive failures compromised well-being in part because they made it hard for individuals to maintain group memberships post-stroke. These findings highlight the importance of social identity continuity in facilitating well-being following stroke and, more broadly, show the theoretical contribution that a social identity approach to mental health can make in the context of neuropsychological rehabilitation.

The COVID-19 pandemic represents a massive global health crisis. Because the crisis requires large-scale behaviour change and places significant psychological burdens on individuals, insights from the social and behavioural sciences can be used to help align human behavior with the recommendations of epidemiologists and public health experts. Here we discuss evidence from a selection of research topics relevant to pandemics, including work on navigating threats, social and cultural influences on behaviour, science communication, moral decision-making, leadership, and stress and coping. In each section, we note the nature and quality of prior research, including uncertainty and unsettled issues. We identify several insights for effective response to the COVID-19 pandemic, and also highlight important gaps researchers should move quickly to fill in the coming weeks and months.

We argue that additional understanding of work motivation can be gained by incorporating current insights concerning self-categorization and social identity processes and by examining the way in which these processes influence the motivation and behavior of individuals and groups at work. This theoretical perspective that focuses on the conditions determining different self-definitions allows us to show how individual and group processes interact to determine work motivation. To illustrate the added value of this approach, we develop some specific propositions concerning motivational processes underpinning leadership and group performance.

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The health of people's body and mind is powerfully conditioned by social factors that affect their social identity. Consistent with this notion, there is a growing interest in the way that group memberships (and the social identities derived from belonging to these groups) affect health and well‐being. To the extent that group memberships provide individuals with meaning, support, and agency (i.e., a positive sense of social identity), health is positively impacted, constituting a “social cure”. However, when group membership is not associated with these positive psychological resources or when social identity is challenged in other ways (e.g., group membership is devalued or stigmatised), social identities may become a curse, threatening and potentially harming health and well‐being. In a range of social contexts, novel examples of these processes are brought together in the contributions to this special issue. In this editorial, we link the findings from these contributions to a set of hypotheses that emerge from the social identity approach to highlight the nuanced ways in which social identity processes are key to understanding health and well‐being (Haslam, Jetten, Cruwys, Dingle, & Haslam, forthcoming). The contributions in this special issue point to fruitful ways to develop the social cure agenda. Together they highlight the importance of social identities as powerful psychological resources that have an important role to play in managing and improving health.

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We argue that additional understanding of work motivation can be gained by incorporating current insights concerning self-categorization and social identity processes and by examining the way in which these processes influence the motivation and behavior of individuals and groups at work. This theoretical perspective that focuses on the conditions determining different self-definitions allows us to show how individual and group processes interact to determine work motivation. To illustrate the added value of this approach, we develop some specific propositions concerning motivational processes underpinning leadership and group performance.