ABSTRACT
Mild hyponatremia is a common finding in pregnancy. Both serum osmolality and sodium levels drop by a predictable amount due to hormonal, renal, and vascular effects leading to a reset osmostat. These changes correct spontaneously after delivery back to nonpregnant levels. Severe hyponatremia rarely develops during pregnancy. Excess water intake, medications, and metabolic or hormonal irregularities can lead to symptomatic, severe hyponatremia requiring a high index of suspicion and careful, immediate treatment.
