noun
a type of altitude sickness that can occur when a person quickly ascends to a high altitude
adjective
describing the severity or intensity of the mountain sickness
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Acute mountain sickness is a serious medical condition that can occur at high altitudes.
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If you start feeling really sick while hiking in the mountains, it could be acute mountain sickness.
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Dude, I got hit with some serious AMS while climbing that peak.
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Dealing with all these deadlines at work is like having acute mountain sickness - overwhelming and hard to cope with.