ABSTRACT
Transient hyperthyroidism is caused by a self-limiting serum excess of thyroid hormones and low TSH, lasting a few weeks to a few months and returns spontaneously to normal. TSH concentration is inversely log-linearly proportional to thyroid hormone excess; minimal changes in serum thyroid hormone levels may suppress serum TSH. It is important to differentiate persistent subclinical hyperthyroidism from other causes of transient TSH suppression.
