Recently, awareness of the importance of health in explaining political participation has grown considerably. Studies have focused on individual participation forms but not on broader participation modes. Furthermore, analyses of the mechanisms explaining the health effects have been lacking. Here, structural equation models are employed to study the relationship between health, political trust, and institutional and non-institutional participation using data from Finland. Poor health is related to increased non-institutional participation, while good health boosts traditional institutional participation, although the latter relationship is very weak. These observations are explained by differences in political trust. Those in good health have stronger trust in the political system, while poor health is connected with reduced trust. These differences manifest themselves in varying behaviour. Poor health decreases trust which leads to increased non-institutional participation, while good health leads to a high trust and institutional activities.