SyndiCARE is an innovative research project looking at the health of union representatives in three countries (France, Quebec and the UK). The topic came to the fore following the COVID pandemic and major social reforms in these three countries. The specialists brought together for this project were all able to observe the growing incidence of health problems among trade unionists, while trade unions are still largely powerless to deal with this issue, even though it is crucial to the way they operate, as it is to social democracy. From a scientific point of view, this topic addresses a major research gap in extant employment relations and sociology literature. The SyndiCARE project aims to fill this gap through ambitious comparative research, combining quantitative and qualitative methodologies, on three contrasting national systems of industrial relations, but exposed to the same trends. Two sectors will be the focus of particular attention: healthcare and transport. For each of these sectors, a threefold focus will be placed on 1/ the characteristics of industrial relations and their effects on the health of union representatives, 2/ the organisational variations and union strategies aimed at preventing and dealing with health issues for union representatives, and 3/ individual and subjective experiences of trade union activity. As well as producing original and unprecedented knowledge, one of the aims of the project is to equip trade unions with a better understanding of the health issues facing activists in order to strengthen their representation role.