inflammation of the thyroid gland. thyroiditis may be an autoimmune disease that affects the thyroid gland over time, causing hypothyroidism (too little thyroid hormone). a temporary form of thyroiditis may also occur after the birth of a baby, or when viral or bacterial infections spread to the thyroid.
出典:Wiktionary
thyroiditis (countable かつ uncountable, 複数形 thyroiditides または thyroiditises または thyroidites)