There are also some very complicated changes that occur in your fluid balance as you acclimate. One of these is a more concentrated blood level and you will find you urinate more frequently. Other changes also take place to help your body adapt to this change in altitude.
Altitude IllnessThe problem of altitude illness starts when acclimatization does not keep pace with your ascent to high altitude. This often happens when you ascend too quickly or go from sea level to high altitude in a day. Altitude illness symptoms are more extreme and serious than those of acclimatization.
Prevent Altitude IllnessThe best way to prevent altitude illness is by making a slow, gradual ascent to altitude and give yourself time to acclimatize. Rates of acclimation are not the same for everyone, so it is not easy to determine the amount of time you will require. Some general guidelines include the following:
After 10,000 feet do not increase sleeping elevation more than 1000 feet per night.
For every 3000 feet of ascent spend two nights at the same elevation. You should also avoid alcohol and remain well hydrated because dehydration occurs more quickly at high altitude.
Recognize Altitude IllnessIf you have recently ascended to 8000 feet or more, you may notice a headache as the first warning sign of altitude illness. Other symptoms may follow and include:
Loss of appetite, nausea, or vomiting
Fatigue or weakness