RATIONALE: The field of mass gathering medicine has tended to focus on physical factors in the aggravation and mitigation of health risks in mass gatherings to the neglect of psychosocial factors. OBJECTIVES: This study sought to explore perspectives of healthcare professionals (HCPs) on (1) implications of social identity processes for mass gathering-associated health risks; and (2) how social identity processes can be drawn on to inform and improve healthcare practices and interventions targeted at mitigating health risks in mass gatherings. METHODS: Semi-structured interviews, complemented by a brief survey, were conducted with 17 HCPs in the United Kingdom operating at a religious pilgrimage and music festivals. RESULTS: The findings fr...