The pathophysiology of thyroiditis varies in each type, namely acute, subacute, and chronic thyroiditis. The pathophysiology of acute thyroiditis generally involves bacterial infection or radiation that causes inflammation, destruction of the thyroid parenchyma, and pain. Meanwhile, the pathophysiology of subacute thyroiditis generally involves viral infection. In chronic thyroiditis, the pathophysiology usually involves an autoimmune condition, the use of certain medications, and a fibrotic process.
