Altitude sickness occurs when the body cannot get enough oxygen from
the air at high altitudes. This causes symptoms such as a headache, loss
of appetite, and trouble sleeping. It happens most often when people
who are not used to high altitudes go quickly from lower altitudes to
2500m or higher. The condition is common — some estimates suggest that
more than 20% of people visiting the European Alps get it. It is
difficult to predict who is likely to suffer, e.g. fitness level does
not seem to affect the likelihood of getting altitude sickness. The
generally recognized treatment for at least mild altitude sickness is
simply to go to a lower altitude…