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
The climber, identified only as a 27-year-old Chinese student living in Japan, made an emergency call on April 22 after developing symptoms of altitude sickness, Shizuoka prefectural police said.
—
Landon Mion, FOXNews.com, 29 Apr. 2025
Moro told Outside that a Ukrainian climber was suffering from altitude sickness and exhaustion, and he was stranded at Camp III at 21,500 feet.
—Ben Ayers, Outside Online, 24 Apr. 2025
Those suffering from altitude sickness may experience: Headache, dizziness, and feeling faint.
—Saleen Martin, USA Today, 31 Oct. 2024
Studies have suggested that the odorless gas can protect vital organs from altitude sickness, while boosting the body’s production of erythropoietin, or EPO, the hormone that stimulates the production of red blood cells.
—Frederick Dreier, Outside Online, 31 Mar. 2025
See All Example Sentences for altitude sickness
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Landon Mion, FOXNews.com, 29 Apr. 2025
Moro told Outside that a Ukrainian climber was suffering from altitude sickness and exhaustion, and he was stranded at Camp III at 21,500 feet.
—Ben Ayers, Outside Online, 24 Apr. 2025
Those suffering from altitude sickness may experience: Headache, dizziness, and feeling faint.
—Saleen Martin, USA Today, 31 Oct. 2024
Studies have suggested that the odorless gas can protect vital organs from altitude sickness, while boosting the body’s production of erythropoietin, or EPO, the hormone that stimulates the production of red blood cells.
—Frederick Dreier, Outside Online, 31 Mar. 2025
See All Example Sentences for altitude sickness
Cite this Entry
“Altitude sickness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/altitude%20sickness. Accessed 16 May. 2025.
Copy CitationMedical 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
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