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Why Do Some People Get Altitude Sickness While Others Don’t?

April 6, 2026

Quick Answer

Altitude sickness occurs when the body cannot adapt to lower oxygen levels at high elevations, causing symptoms like headaches and nausea, due to genetic and environmental factors, including acclimatization rate and individual physical condition.

Factors Contributing to Altitude Sickness

Altitude sickness can affect anyone, but some people are more susceptible than others due to factors such as genetics, physical condition, and acclimatization rate. Research suggests that people with a slower acclimatization rate are more likely to develop altitude sickness, with studies indicating that the body adapts to high altitude at a rate of about 300 meters per day. This means that ascending too quickly can lead to altitude sickness.

Acclimatization Strategies and Descent

To prevent altitude sickness, it’s essential to ascend gradually, allowing the body to adapt to the lower oxygen levels. Travelers can use the “climb high, sleep low” strategy, where they ascend to a higher altitude during the day but sleep at a lower elevation. If symptoms of altitude sickness occur, immediate descent is often recommended, with a gradual reduction in elevation every 300-500 meters. For severe cases, medical treatment with Diamox (acetazolamide) may be necessary.

Treatment and Prevention with Diamox

Diamox, a medication used to treat altitude sickness, works by increasing breathing rate and promoting the production of red blood cells. When taken before ascending to high altitude, Diamox can help prevent altitude sickness. However, it’s essential to note that Diamox is not a substitute for proper acclimatization and should only be used under medical supervision. The recommended dosage for Diamox varies, but a typical dose is 250-375 mg per day, taken in the morning.

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