Phenomenon : While professionalism is largely understood to be complex and dynamic, it is oftentimes implemented as if it were static and concrete. As a result, policies and practices reflect dominant historical norms of the medical profession, which can cause tension for trainees from marginalized groups. One such group comprises those who identify as first-generation physicians - those whose parents have not earned an associateâs degree or higher. This group is highly diverse in terms of gender, race, ethnicity, and socioeconomic status; however, their experiences with institutional professionalism policies and practices has not yet been fully explored. In this study, our aims were to understand the ways in which these participants experience professionalism, and to inform how professionalism can be more inclusively conceptualized. Approach : In November 2022-March 2023, we conducted semi-structured interviews with 11 first-generation medical students, residents, and physicians and analyzed select national and institutional professionalism policies in relation to key themes identified in the interviews. The interviews were designed to elicit participantsâ experiences with professionalism and where they experienced tension and challenges because of their first-gen identity. Data were analyzed using thematic analysis through a critical perspective, focused on identifying tensions because of systemic and historical factors. Findings : Participants described the ways in which they experienced tension between what was written, enacted, desirable, and possible around the following elements of professionalism: physical appearance; attendance and leaves of absence; and patient care. They described a deep connection to patient care but that this joy is often overshadowed by other elements of professionalism as well as healthcare system barriers. They also shared the ways in which they wish to contribute to changing how their institutions conceptualize professionalism. Insights : Given their unique paths to and through medicine and their marginalized status in medicine, first-generation interviewees provided a necessary lens for viewing the concept of professionalism that has been largely absent in medicine. These findings contribute to our understanding of professionalism conceptually, but also practically. As professionalism evolves, it is important for institutions to translate professionalismâs complexity into educational practice as well as to involve diverse voices in refining professionalism definitions and policies.