<unk>  features a small goiter without tenderness. This condition tends to have a phase of hyperthyroidism followed by a return to a euthyroid state, and then a phase of hypothyroidism, followed again by a return to the euthyroid state. The time span of each phase can vary; however, each phase usually lasts 2–3 months.
Subacute lymphocytic thyroiditis
Radiation-induced thyroiditis
Subacute thyroiditis
Autoimmune thyroiditis
Hashimoto's thyroiditis
Ord's thyroiditis
Acute infectious thyroiditis
Riedel's thyroiditis