He was left weakened, dehydrated and in pain by altitude sickness and exhaustion.
And now that you mention it, I also got seasick, and had altitude sickness, and had to be rescued a few times.
But everything I read said women like me, who got seasickness, altitude sickness, motion sickness, were more likely to suffer HG.
altitude sickness al·ti·tude sickness (āl'tĭ-tōōd', -tyōōd')
A collection of symptoms, including shortness of breath, nausea, and nosebleed, brought on by decreased oxygen in the atmosphere, such as that encountered at high altitudes. Also called Acosta's disease.