Is altitude sickness common? And how high is the Inca Trail?
It’s impossible to predict who will be affected by altitude. Your ability to adapt to high altitude is determined by your genetic makeup and has little to do with fitness or health. Most people will have no problems as long as they take the time to acclimatize properly. A full day spent in Cusco (3249m), taking it easy and drinking plenty of water, is usually enough for most people. The highest point you will reach while hiking the Inca Trail is 4200 meters. You will sleep at 3600 meters for one or two nights.
