Physical Activity, Fatigue, Social Support, and Psychological Well-Being in Women With Primary Hypothyroidism

Inclusion Criteria: * Have a diagnosis of primary hypothyroidism (clinical or subclinical), established by a specialist in Endocrinology or Internal Medicine based on TSH and FT4 levels. * Female. * Are aged ≥18 years at the time of inclusion. * Have stable treatment for thyroid dysfunction (levothyroxine dose or other replacement regimen without relevant modifications) for at least the previous 3 months, or a stable clinical condition if treatment is not required. * Are able to ambulate independently in the community (with or without usual assistive devices), allowing participation in light to moderate physical activity. * Are able to understand and complete the questionnaires independently. * Have provided written informed consent Exclusion Criteria: * Have a diagnosis of severe medical conditions that predominantly limit the ability to perform physical activity independently of hypothyroidism (e.g., advanced heart failure, severe chronic respiratory disease). * Have severe psychiatric disorders or significant cognitive impairment that hinder understanding of the information or reliable completion of the questionnaires. * Have undergone major surgery, severe trauma, or an acute medical condition that has substantially limited physical activity in the three months prior to assessment. * Are pregnant or in the immediate postpartum period, due to potential hormonal and functional interference with the study variables. * Are concurrently participating in a clinical trial or a structured physical exercise program.