If route considerations force you to do more, monitor your condition closely and take a rest day if necessary. No exceptions, no excuses. The common early symptoms are headaches, slight nausea, dizziness, heart palpitations, and shortness of breath. Never go higher if you have even minor symptoms. If your symptoms worsen or intensify, go downhill to the last place you felt well.
Severe symptoms can quickly turn into fatal pulmonary or cerebral edemas.
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