Thyroiditis primarily includes acute, subacute, and chronic forms. Acute and subacute thyroiditis are generally seen in bacterial and viral infections, while chronic thyroiditis mainly consists of autoimmune thyroiditis, painless thyroiditis, and postpartum thyroiditis. However, autoimmune thyroiditis itself encompasses five scenarios, including Hashimoto's thyroiditis, atrophic thyroiditis, painless thyroiditis, euthyroid thyroiditis, and Hashitoxicosis. These types of thyroiditis are mainly seen in chronic thyroid conditions and are all autoimmune diseases. Therefore, the type of thyroiditis should be determined based on the cause to develop appropriate treatment plans.