CLINICAL MANIFESTATIONS OF THYROID DISEASES: DIAGNOSTIC CHALLENGES, DIFFERENTIAL DIAGNOSIS, AND INDIVIDUALIZED APPROACHES TO PATIENT MANAGEMENT

Abstract

Thyroid diseases present through altered hormone production, diffuse or focal structural abnormalities, and inflammatory processes. Their clinical significance cannot be established from fatigue, weight change, or neck enlargement alone. This narrative review examines hypothyroidism, hyperthyroidism, autoimmune thyroiditis, nodular goiter, and features that raise concern for malignancy. Clinical findings are interpreted alongside thyroid-stimulating hormone, free thyroxine, and additional investigations selected for the presentation. Ultrasonography evaluates structure but does not independently determine hormonal function. Early recognition of emergencies, identification of the cause of thyrotoxicosis, and risk-based assessment of nodules are central to appropriate care. Treatment should reflect the disease mechanism, age, cardiovascular status, and individual circumstances. Follow-up must assess symptoms, laboratory response, medication safety, and quality of life rather than biochemical results in isolation.