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hyponatremia (s) (noun)
, hyponatremias (pl)
A lower-than-normal level of sodium, or salt, in the blood: "Hyponatremia has sometimes been referred to as water intoxication
; especially, when it is caused by an excess consumption of water, as during strenuous exercise and without an adequate replacement of sodium."
"When a person has hyponatremia, there is a loss of sodium which is essential for many body functions including the maintenance of fluid balance, regulation of blood pressure, and normal function of the nervous system; and when it is severe, it can lead to confusion and seizures."