A Case of Hyponatremia in Hypothyroidism / 대한신장학회지

ABSTRACT

Hypothyroidism is widely accepted as a cause of hyponatremia, but severe hyponatremia in hypothyroidism is clinically rare. We report a case of 74-year-old female patient presented with severe hyponatremia and hypothyroidism. Hyponatremia gradually improved with water restriction and hypertonic sodium infusion prior to the initiation of thyroid hormone replacement. After a diagnosis of Hashimoto's thyroiditis had been made, the patient was treated with levothyroxine. She remained well on maintenance dose of levothyroxine with euthyroid and normal serum sodium level.