This study aims to understand the health and social care needs and experiences of adults who frequently use urgent and emergency care services in Dorset. Using a mixed-methods design, the study combines analysis of non-patient-identifiable business intelligence data with qualitative interviews and co-production activities. The business intelligence data contextualises patterns of high intensity service use and informs participant identification. Qualitative interviews will explore the personal, social and system-level factors that contribute to frequent attendance. Co-production activities with an advisory group, supported by The Lantern Trust in Weymouth, will use these findings to develop a preventative intervention model grounded in lived experience. The study will recruit up to 50 patients, up to 10 carers and up to 20 health and social care professionals. The findings will contribute to the development of more effective, person-centred approaches to supporting people who frequently use urgent and emergency care services and will inform national and local policy in this area.