Interesting. I'm surprised that in a situation where you're packing your own water, someone could drink enough plain water to induce hyponatremia.
It's a combo of drinking free water and losing salty water. Relatively easy to fix, a real PITA to diagnose, since it looks pretty close to heat exhaustion. In fact, a lot of times with patients I'll just recommend gatorade alternating with water for active folks.
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