altitude sickness

noun

: the effects (such as headache, nausea, or swelling of the brain) of oxygen deficiency in the blood and tissues developed at high altitudes having reduced atmospheric pressure see mountain sickness

Examples of altitude sickness in a Sentence

Recent Examples on the Web

Travelers should also be aware of the potential for altitude sickness in some areas of the country. — Michael Cappetta, Travel + Leisure, 27 Aug. 2026

The inclement weather conditions and fatigue combined with the altitude sickness that could set in at that height are a bad combination for even the most experienced hikers. — Austin Perry Outkick, FOXNews.com, 26 Aug. 2026

Climbers of the 12,388 feet-tall (3,776 meters) volcano have had to be rescued after suffering altitude sickness in the past. — Chris Lau, CNN Money, 23 Aug. 2026

The jet has the lowest cabin altitude in its class—2,691 feet while cruising at 41,000 feet—which can help to stave off fatigue and altitude sickness. — Rachel Cormack, Robb Report, 8 June 2026

Word History

First Known Use

1901, in the meaning defined above

Rhymes for altitude sickness

• homesickness
• seasickness
• quickness
• thickness

Medical Definition

altitude sickness

noun

al·​ti·​tude sickness ˌal-tə-ˌt(y)üd- 

: the effects (as nosebleed, nausea, headache, or cerebral edema) of oxygen deficiency in the blood and tissues developed at high altitudes with reduced atmospheric pressure