he Fifty-seven cases of hyperthyroidism in the elderly are analysed and their clinical features are dis-cussed The clinical man festations of hyperthyroidism in the aged are not typical and without obvious hyper-metabOlic state and severe enlargement of thyroidy and severe exophthalmos. Cardic disease of hyperthy-roidism is 40.3%in the aged with hyperthyroidism and the incindenec of cardic disease of hyperthyroidism issignificantly higher than that in adult patients (P<0. 01 ). The incidence of myopathy of hyoerthyroidism is15.8%. The misdiagnostic rate of hyperthyroidem in the aged is 35.1%. Measurement of thyroid.Function isof important diagnostic value.