"Thyrotoxic psychosis" associated with subacute thyroiditis.

Severe psychiatric derangements are a rare manifestation of Graves disease or toxic goiter. An 18-year-old male college student was hospitalized with depression and psychotic behavior. He was found to have thyrotoxicosis due to subacute thyroiditis, as evidenced by a reduced radioactive iodine uptake, elevated thyroglobulin level, and spontaneous remission into a hypothyroid phase. His behavioral abnormalities resolved with progressive normalization of thyroid function. To our knowledge, this is the first reported case of the self-limited condition of subacute thyroiditis causing 'thyrotoxic psychosis' and serves to remind clinicians of this association when treating patients in clinical practice.