Subclinical hyperthyroidism is an entity that is being increasingly recognised, probably because
of the ageing of the population and the development of assays with enhanced thyroid-stimulating
hormone sensitivity. It is characterised by a clearly low serum concentration of thyrotropin and
the absence of obvious symptoms of overt hyperthyroidism. In this two part article, Dr Nabil
Aly reviews the clinical features and treatment options in older adults.