| 11. | Expert climbers can reach the top faster, but many experience altitude sickness.
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| 12. | Morse toiled in cold mud, battled altitude sickness and quickly shed 25 pounds.
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| 13. | Cotton and others collapsed from altitude sickness during the five-day climb.
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| 14. | He has dealt with altitude sickness, and hiking in the dark.
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| 15. | He is remembered for pioneer studies of altitude sickness and hypoxia.
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| 16. | Encounters with passing yaks, and hypothermia and altitude sickness, are common.
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| 17. | The Terran women suffer frostbite and altitude sickness, but continue despite their troubles.
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| 18. | A single randomized controlled trial found that sumatriptan may help prevent altitude sickness.
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| 19. | Last summer altitude sickness ruined one Sierra trip of mine and half-ruined another.
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| 20. | Due to the elevation of, some passengers may experience symptoms of altitude sickness.
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