Patients with thyroiditis are most often autoimmune and are first treated in endocrinology, and if necessary, they can be seen in surgery, rheumatology, and thyroid specialists. The clinical classification of thyroiditis is diverse and can be classified by etiology as bacterial, viral, autoimmune, post-radiation, parasitic, tuberculosis, syphilis, and HIV infection. The most common thyroiditis in clinical practice is chronic lymphocytic thyroiditis and subacute granulomatous thyroiditis and painless thyroiditis; the most common from an etiologic point of view is autoimmune thyroiditis. Most patients with thyroiditis present mainly with transient hyperthyroidism or hypothyroidism and are therefore treated mainly through endocrinology. Some patients will have concomitant systemic autoimmune disease, or thyroid symptoms that are themselves part of a systemic autoimmune disease, and may also be treated in a rheumatology emergency with adjunctive endocrine therapy. Other patients with significant thyroid masses or symptoms of compression that require surgery may also be seen in head and neck surgery or thyroid specialists for adjuvant endocrine therapy. Some bacterial thyroiditis, with obvious symptoms of infection and normal thyroid function, can be seen and treated in surgery. Therefore, thyroiditis is a group of diseases characterized by inflammation of the thyroid gland in common, and its main symptoms are usually caused by hyperthyroidism and hypothyroidism, so the preferred department for consultation is the endocrinology department.