This hospital-based observational cross-sectional study aims to investigate the morphometric characteristics of internal organs and the morphofunctional status of the musculoskeletal system in adult patients with previously diagnosed hypothyroidism. The study will evaluate ultrasonographic morphometric characteristics of the liver, pancreas, and kidneys, as well as anthropometric and functional characteristics of the musculoskeletal system. Associations between these outcomes and clinical characteristics, anthropometric parameters, physical activity, and laboratory findings will also be assessed. The study is expected to identify accessible clinical, anthropometric, and functional markers associated with morphometric and musculoskeletal changes in patients with hypothyroidism, thereby improving risk assessment and early detection of systemic involvement.