A group of 42 thyrodiabetics was studied and a total of 45 thyroidectomies were done. Cases were gleaned from 1616 diabetics and 1607 patients who had thyroidectomy. The incidence of thyrodiabetics to diabetic admissions was 2.41%, and of hyperthyroid admissions 2.43%. Highest incidents occurred in patients 51 to 70 yrs. of age. [female][female] predominated. Operative mortality rate was 2.38%. Diagnosis of hyperthyroidism as a complication of diabetes mellitus was easily overlooked.