Hiker Fatality From Severe Hyponatremia in Grand Canyon National Park

A fatal case of severe hyponatremia, likely the first documented in a wilderness hiking setting, occurred at Grand Canyon National Park. The hiker, who consumed excessive water during a 5-hour trek, collapsed and died from cerebral edema within 24 hours despite medical intervention with intravenous saline. The incident highlights the dangers of overhydration, particularly in strenuous environments, and underscores the importance of adhering to treatment guidelines—symptomatic hyponatremia should be managed with hypertonic saline rather than isotonic fluids, which can delay recovery or prove fatal. This case also illustrates the challenges of diagnosing and treating acute hyponatremia in remote settings.

Myers, T. M., & Hoffman, M. D. (2015). Hiker Fatality From Severe Hyponatremia in Grand Canyon National Park. Wilderness & Environmental Medicine, 26(3), 371–374. https://doi.org/10.1016/j.wem.2015.03.001