mountain sickness

noun Pathology.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mountain sickness
 
n
1.  Also called: altitude sickness nausea, headache, and shortness of breath caused by climbing to high altitudes (usually above 12 000 ft)
2.  vet science a disease of cattle kept at high altitude in S and N America, characterized by congestive heart failure

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American Heritage
Medical Dictionary

mountain sickness moun·tain sickness (moun'tən)
n.
Altitude sickness brought on by the diminished oxygen pressure at mountain elevations.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If things don't go well, one can get acute mountain sickness, which often
  starts with a headache reminiscent of a hangover.
Be on the alert for the early symptoms of acute mountain sickness, such as a
  persistent headache or nausea.
But chances are he's suffering from the sudden onset of acute mountain sickness.
Some medications are available for prevention or treatment of acute mountain
  sickness.
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