Hyponatremia

(Greek hypo- - under, below, lower; Latin [obsolete] natrium - sodium; Greek -haemia/ -aemia/ -hemia/ -emia - blood condition)

Hyponatremia occurs when sodium in the blood is at a low level. Sodium ions (Na⁺) help to distribute fluids in your body. A lack of sodium can therefore cause dehydration.

Water and salt are lost by sweating, and salt contains sodium.

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