you wouldn't be diagnosed with hyponatremia for drinking too much of anything else like coffee mentioned above. It is specific to too much water replacement and not enough sodium replacement. This is a condition whose median is age group endurance athletes, typically marathoners. Furthermore it is predominantly a lower weight female condition. Because men weigh more it is more difficult for them to reach the condition.

Though this is a condition that can be fatal, it is rare. The media has like much else sensationalized it for their purpose. Furthermore it is a race day problem that can be easily controlled by simple steps like using a sport drink, gel or electrolyte replacement pill.

Hikers, who populate this forum more than endurance athletes, should have no problem with this whatsoever. Our meals are overly salted. I might guess as little as a couple cheeks of beef jerky is enough for a day of our movement to stave this off. Though I use electrolyte replacement pills (I use Endurolytes by Hammer)in my endurance training and hiking.