Hiker Fatality From Severe Hyponatremia in Grand Canyon National Park The stress-associated hyponatremia in endurance athletes is well-known and well examined. An American group describes the case of a woman who wandered at the Grand Canyon National Park for 5 hours.During this hike, she should have drunk a lot of water.After she collapsed she was brought to the nearest hospital and a hypervolemic hyponatremia with encephalopathy was diagnosed.Despite all measures, it died within 24 hours on a brain edema.
This case shows that an excessive supply of water can also be deletary even at low physical load. The case is described under https://pubmed.ncbi.nlm.nih.gov/25935312/