“…Amongthe various hypotheses which have been proposed to explain the hyponatremia in hypothyroidism, inappropriate secretion of ADH (2,3,8) and adreno-cortical dysfunction (4, 9) have been frequently described. However, changes in the glomerular filtration rate, renal plasma flow and tubular excretory capacity (5, 6) have also been observed in hypothyroidism and are potential causes of hyponatremia.…”