The following are risk factors for AMS:

  • a history of previous acute mountain sickness,
  • fast ascent (≥625 m per day above 2000 m)
  • lack of previous acclimatization.
  • living at low altitudes (<2000 ft),
  • strenuous physical exertion during the ascent (can exacerbate AMS)
  • female sex,
  • an age younger than 46 years,
  • history of migraines.

Alcohol consumption on the first day at high altitude can exacerbate AMS.

Exercise may exacerbate AMS, but good physical fitness is not protective.

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