This review article deals with the classification, clinical features and morphology of thyroiditis. These inflammatory diseases account for approximately 20 % of all thyroid diseases. The vast majority of cases of thyroiditis are of immunogenic origin while non-immunogenic thyroiditis (caused by pathogens or iatrogenic) is a rarity.
Keywords: Autoimmune thyroiditis; Immunogen; Riedel’s thyroiditis; Subacute granulomatous thyroiditis; Thyroiditis.