If you’ve seen marathon runners collapse, it’s because of hyponatremia. Hyponatremia is a state where the concentration of salt in the body is abnormally low. Most are familiar with dehydration and it’s likely more common, however hyponatremia is not talked about quite as much and can be deadly. As discussed in this article, it can cause confusion, nausea, headache, and swelling of the brain which can lead to death if severe enough. Another problem that it has been linked to is osteoporosis.

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