In this introduction, I explore theories of injury and ethnographic methods for studying them. I treat injuries and their causes holistically, as reflecting the wounding and coactive effects of an array of harmful exposures, historical circumstances, technologies, environments, and political systems. In conceiving of injury across different scales of time, I offer insights into what health scholars term the ‘secondary’ impacts of injury on claimants and their families. Increasingly, scholars recognize that compensation systems, medico-legal assessments, and claim-making practices themselves contribute to or cause significant negative harm and secondary impacts to both the injured and their families. In contrast to the medical language of primary and secondary illness, I argue for a participant-centred and experience-near approach, one that can trace the connections test veterans themselves draw across time and within their personal and community illness narratives, as they built understandings of radiation injury and harm. Original injury or exposure ‘events’ were narratively enfolded within the cascade of transforming and accumulating harms that participants experienced.