This prospective observational cohort study aims to examine changes in occupational disidentification among undergraduate nursing interns during clinical internship and to identify factors associated with high-risk trajectories. Undergraduate nursing students will be followed using online questionnaires from the end of the first internship week and approximately every three months until the end of internship. The study will assess occupational disidentification, personal psychological resources, clinical learning environment, occupational stigma, negative clinical experiences, transition shock, emotional exhaustion, occupational fatigue, sleep, and musculoskeletal symptoms.