It is unclear whether the father and son reached the summit, but any travelers reaching altitudes of 8,000 feet — sometimes lower — are susceptible to altitude sickness and symptoms.

Zane Wach, 14, left, began hallucinating before stepping off a 120-foot cliff while hiking with his father, seen right.

Zane Wach, 14, was exhibiting symptoms of altitude sickness before falling from a cliff on California's Mount Whitney.

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Ryan Wach said his son Zane Wach, 14, experienced altitude sickness while climbing California's Mount Whitney and seemed to ...

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A California teen, who was placed in a coma after he hallucinated and walked off a cliff while hiking, is now breathing on ...