
Altitude sickness—also known as acute mountain sickness (AMS), altitude illness, hypobaropathy, `the altitude bends`, or soroche—is a pathological effect of high altitude on humans, caused by acute exposure to low partial pressure of oxygen at high altitude. It commonly occurs above 2,400 metres (8,000 feet). It presents as a collection of n.....
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http://en.wikipedia.org/wiki/Altitude_sickness

acute reaction to a change from sea level or other low-altitude environments to altitudes above 8,000 feet (2,400 metres). Altitude sickness was ... [3 related articles]
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http://www.britannica.com/eb/a-z/a/53

A condition stemming from a lack of oxygen in blood and tissues due to low atmospheric pressure. Night vision is impaired, followed by breathlessness, headache, and faintness. At 5,000 meters, mental changes include indifference, euphoria, and faulty judgment but complete acclimatization is possible...
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A condition that results from prolonged exposure to high altitude. ... Symptoms include a continuous dry cough, shortness of breath, poor exercise tolerance, dizziness, headache, sleep difficulty, anorexia, confusion, fatigue and a rapid pulse. ... Treatment includes the immediate movement to a lower altitude. Prophylaxis has been accomplished succ...
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Type: Term Definitions: 1. a syndrome caused by low inspired oxygen pressure (as at high altitude) and characterized by nausea, headache, dyspnea, malaise, and insomnia; in severe instances, pulmonary edema and adult respiratory distress syndrome can occur; Synonyms: Acosta disease, mountain sickness, puna, soroche
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http://www.medilexicon.com/medicaldictionary.php?t=81715

Altitude sickness: Altitude sickness (or altitude illness) is a disorder caused by being at high altitude. It more commonly occurs above 8,000 feet (2,440 meters). The cause of altitude illness is a matter of oxygen physiology. At sea level the concentration of oxygen is about 21% and the barometric pressure averages 760 mmHg. As altitude increases...
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http://www.medterms.com/script/main/art.asp?articlekey=8584

[
n] - effects (as nosebleed or nausea) of oxygen deficiency in the blood and tissues at high altitudes
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http://www.webdictionary.co.uk/definition.php?query=altitude%20sickness

headaches, dizziness, and nausea usually experienced at heights above 8,000 ft because of reduced oxygen in the air
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https://www.encyclo.co.uk/local/20875
noun effects (as nosebleed or nausea) of oxygen deficiency in the blood and tissues at high altitudes
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https://www.encyclo.co.uk/local/20974

Sickness that occurs at high elevation, usually above 8000 feet and is caused by the lower level of oxygen found at such high altitudes. It rarely affects holiday skiers and the more severe symptoms of altitude sickness tend to occur at altitudes of 3,600m (about 12,000 feet) and above.
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a condition affecting some persons at high altitudes, caused by insufficient oxygen in the blood and characterized by dizziness, nausea, and shortness of breath.
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https://www.infoplease.com/dictionary/altitude-sickness
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