BackgroundThe incidence of papillary thyroid carcinoma (PTC) is rising worldwide. Despite its excellent prognosis, many PTC patients experience impaired Health-Related quality of life (HRQoL). Vitamin D exerts pleiotropic effects on musculoskeletal, immune, and psychological health, but its impact on HRQoL in PTC patients remains unclear.MethodsThis prospective cohort study consecutively recrui...