mountain sickness

Ascending too quickly increases the chances of altitude-related illnesses, like acute mountain sickness, with symptoms that include headache, nausea, dizziness, and shortness of breath.

Meantime my mountain sickness tuned up something fierce, and I sat down on a big rock to wait for it to ease down.

And how will I manage to tow along this lump of a Pinocchio who is half dead with mountain-sickness?

The altitude of the rim of the canyon was 16,000 feet; the mules showed signs of acute distress from mountain sickness.

The severity of mountain-sickness differs greatly in different localities, apparently not depending entirely on the altitude.

"It's the soroche, the mountain-sickness," explained Professor Ditson.