Nutrition
Exercise Associated Hyponatremia
Exercise associated hyponatremia is low blood sodium from over-drinking plain water in long hot efforts—prevent with electrolytes, not water alone.
Exercise associated hyponatremia is low blood sodium during or after long efforts—often from over-drinking plain water without replacing sweat salt in humid heat. Symptoms mimic heat illness: confusion, nausea, headache, and swelling.
Prevention pairs drink-to-thirst with electrolytes on multi-hour sessions; know event medical plans. Distinct from dehydration alone.
Common questions
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Can hyponatremia happen in humid marathons?
Yes—runners who drink water every mile without sodium are at risk even when not dehydrated. Match fluids to thirst and include sodium on efforts over two to three hours.
Related terms
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