Altitude sickness is one of the major problems while you will travel in high altitudes like Cusco. But there are certain measures that can be applied while traveling at the high altitudes; which help the travellers to avoid the altitude sickness. Besides, if it will affect to any trekkers/ traveller then there are several provisions for the first aid and other medicines to recover. If the condition of the trekkers gets worst, then he will immediately transfer to the nearby hospitals.