Abstract
A 23 yr old woman had silent thyrotoxic thyroiditis and chronic adrenocortical insufficiency (Addison''s disease). Silent thyroiditis apparently is an autoimmune disease characterized by lymphocytic infiltration of the thyroid and by transient hyperthyroidism, followed occasionally by transient hypothyroidism and eventually recovery. This case would seem to expand the spectrum of autoimmune thyroid diseases (Graves'' disease, lymphocytic [Hashimoto''s] thyroiditis and hypothyroidism) associated with chronic adrenocortical insufficiency.