Recognize and treat acute thyroiditis as a cause of transient hyperthyroidism.         

Explanation:   

Sub acute thyroiditis is a cause of transient hyperthyroidism where the injured thyroid tissue offloads all its stores and causes hyperthyroidism.Patient presented in question usually has soreness in neck/throat region.

It can be due to Viruses(De-quervain's) or auto-immune(Hashimoto's). Antibodies to thyroid peroxidase are positive in the latter.

The thyroid radioactive iodine uptake is the test of choice to distinguish this from Graves disease where thyroid scan shows increased uptake in graves but decreased uptake in thyroiditis . Thyroiditis is best treated with Aspirin or steroids and use Beta blockers to control peripheral manifestations of hyperthyroidism. Also see endo3.htm