BackgroundJourneying with patients throughout their cancer trajectory and caring for them at the end of life can lead to emotional and moral distress in oncologists, negatively impacting their personal and professional identities. A better understanding of how transitions in care goals affect oncologists can shed light on the challenges faced and the support required. This study explored the impact of care transitions on oncologists’ professional identity formation (PIF).MethodsFrom September to December 2023, semi-structured interviews were conducted with oncologists in a palliative care center in Singapore. The Ring Theory of Personhood (RToP) was used as a framework to capture the effects of experiences with patients transitioning from curative to palliative care on the oncologists’ sense of self and identity. Data were analyzed using both inductive and deductive qualitative analysis.ResultsParticipants included six female and six male physicians, aged 30 to 53 years (mean 38 years), with an average of 9.75 years of experience as oncologists. The main domains identified were 1) challenges faced in transitioning patients to palliative care, 2) the impact of dealing with dying patients on oncologists, and 3) coping mechanisms.ConclusionOncologists experience self-doubt and moral distress as they manage transitions in care. The PIF of oncologists can be supported through reflection and introspection, peer support, and interventions to promote self-care — ultimately enabling them to make meaning of their experiences, renew family ties, and reaffirm their commitment to the profession.