Also known as mountain sickness, this is basically a consequence of the shortage of oxygen. It is suffered mainly by people who do not acclimatize within a day or two, at an altitude of over 2,000 meters above sea level. Even though the effects are different in every person, almost all tourists who arrive at Cusco by plane are prone to suffering altitude sickness. In fact, there are some people who are never affected by altitude at all. There are various symptoms that generally show within the first 48 hours of ascent, among which we can mention headaches, nausea, loss of appetite and even a feeling of breathlessness, sleep problems and palpitations, among others.

Prevention

The best way to prevent altitude sickness is by making a gradual ascent. It is essential for travellers to Cusco to carry out their activities in a gradual way. It is highly advisable to rest for a day, have a light meal and enjoy the delicious mate of coca, a brew that is effective against mountain sickness.
If you have some time available and can spend the first nights of your trip to Cusco in the Holy Valley, you will have fewer chances of being affected by altitude sickness.