This study aims to identify common catalysts of worker-to-worker violence and incivility in hospital settings. Qualitative content analysis was conducted on the total sample of employee incident reports of worker-to-worker violence and incivility that were documented in 2011 at a large American hospital system. Two primary themes emerged from the analysis: Work Behaviour and Work Organisation. Incidents of worker-to-worker violence and incivility stemmed from dissatisfaction with employee behaviour or from organisational practices or work constraints. These incident descriptions reflect worker dissatisfaction and frustration, resulting from poor communication and collaboration between employees, all of which threaten work productivity.