Hyponatremia overview

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The electrolyte disturbance hyponatremia exists in humans when the sodium (Natrium in Latin) concentration in the plasma falls below 130 mmol/L. At lower levels water intoxication may result, an urgently dangerous condition. Hyponatremia is an abnormality that can occur in isolation or, as most often is the case, as a complication of other medical illnesses.