0 breathing problems and dizziness as a result of having less oxygen to breathe in high areas, for example when climbing mountains:
They are suffering from all kinds of mountain hazards, such as altitude sickness, snow blindness, and hypothermia.
He estimates that 25 percent of visitors to Colorado suffer from altitude sickness.
Altitude sickness inflicts headaches, nausea and insomnia usually lasting from 24 to 36 hours.
