Altitude sickness or acute mountain sickness, a pathological condition that is caused by acute exposure to low air pressure
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In the sierra of Peru, Bolivia, and northern Argentina, coca has been consumed (by chewing and brewing in infusion) for thousands of years as a stimulant and cure for altitude sickness; it also has symbolic value.
In aviation, pressure suits protect fighter pilots from hypoxia / altitude sickness, and g-suits from the adverse effects of acceleration (gravity-induced loss of consciousness, or G-LOC).
He reached the base camp at 5,364 metres (17,598 ft) but the Altitude sickness made him stop climbing for a few days, during his second attempt Arana's illness progressed to high altitude pulmonary HAPE and cerebral HACE edema which led to Arana's emergency evacuation to Kathmandu.