Thyroiditis refers to a group of clinical diseases that involve the thyroid gland due to various reasons. Due to different causes, the clinical manifestations and prognosis of thyroiditis can vary significantly. Based on the duration of the disease, thyroiditis can be classified as acute, subacute, and chronic. Based on the cause, it can be divided into infectious, autoimmune, and radiation-induced thyroiditis, among others. Common types of thyroiditis that cause pain mainly include acute thyroiditis and subacute thyroiditis, while chronic thyroiditis, such as Hashimoto's thyroiditis, painless thyroiditis, and postpartum thyroiditis, generally do not cause pain.