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 agency also noted that mountaineers must also deal with altitude sickness due to the high elevation levels of the mountain.
—
Kimberlee Speakman, People.com, 5 June 2025
More on altitude sickness, risks of climbing Mount Fuji
Mount Fuji was created from volcanic activity that started 100,000 years ago, per the Japan National Tourism Organization.
—Saleen Martin, USA Today, 31 Oct. 2024
On their ascent, one of the team members, a Nepali soldier named Narayan Singh, showed signs of altitude sickness.
—Ben Ayers and Tulsi Rauniyar, Outside Online, 7 May 2024
Even dosing people with EPO directly with injections may not prevent altitude sickness or improve performance at high elevation, Subudhi says.
—Stephanie Pappas, Scientific American, 29 May 2025
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Kimberlee Speakman, People.com, 5 June 2025
More on altitude sickness, risks of climbing Mount Fuji
Mount Fuji was created from volcanic activity that started 100,000 years ago, per the Japan National Tourism Organization.
—Saleen Martin, USA Today, 31 Oct. 2024
On their ascent, one of the team members, a Nepali soldier named Narayan Singh, showed signs of altitude sickness.
—Ben Ayers and Tulsi Rauniyar, Outside Online, 7 May 2024
Even dosing people with EPO directly with injections may not prevent altitude sickness or improve performance at high elevation, Subudhi says.
—Stephanie Pappas, Scientific American, 29 May 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 5 Jul. 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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