Mountain sickness.
The varied and subtle symptoms of this potentially lethal disorder humble many who scale the summits. But the problem is often preventable.
Houston
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D000064:Acclimatization / Q000502:physiology; D000532:Altitude Sickness / Q000266:history / Q000503:physiopathology* / Q000517:prevention & control; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D000860:Hypoxia / Q000503:physiopathology; D009051:Mountaineering / Q000266:history / Q000502:physiology*; D011654:Pulmonary Edema / Q000503:physiopathology