About 20 percent of people who travel to the Rocky Mountains or other peaks over 8,000 feet experience acute altitude sickness.  It’s due to oxygen deprivation and results in headache, loss of appetite, and trouble sleeping.  Altitude sickness occurs most often when people travel quickly from lower altitudes to higher altitudes.  It has nothing to do with fitness levels, and both men and women are equally likely to suffer from altitude sickness.…

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