Incidence of hypothyroidism in patients undergoing radiotherapy for head and neck cancer at the Tellippalai Trail cancer hospital

Head and neck cancers (HNCs) are a significant global health concern with substantial morbidity and mortality. The relatively low metastasis rate of HNCs allows for effective management through localized treatments like surgery and radiotherapy. However, radiation-induced hypothyroidism (RIH) can occur when the thyroid gland is inadvertently exposed during radiotherapy. This exposure damages thyroid tissue, compromising hormone production. Taking focused history during follow-ups is crucial for early detection of RIH. This study aims to investigate the incidence of RIH in patients who have received neck radiotherapy in Northern Sri Lanka.