This study describes the nature of unmet needs (UN) as women with breast cancer transition from “patient” to “survivor.” Data are from a longitudinal study of 90 women with stage I-III breast cancer. Data were collected 2–3 weeks before, and 10 weeks after, completion of radiation. A modified Cancer Survivors’ Unmet Needs (CaSUN) instrument measured UN. Most participants reported ≥1 unmet need at baseline (80.00%) and follow-up (69.31%), with UN across physical, healthcare, information, psychosocial, and survivorship domains. Total number of UN declined over time (t(87)=3.00, p<.01). UN likely to persist from baseline to follow-up involved cancer recurrence concerns, stress management, household responsibilities, and others not acknowledging/understanding cancer. Younger women (p=.01) and those with more severe (p<.01), life-interfering (p=.01) symptoms had greater burden of UN. This study highlights the dynamics of UN in the weeks before and after primary treatment. Future studies should identify long-term consequences of persistent UN.