Altitude Mountain sickness Called "Soroche" in Peru is the most common sickness that affects more than 50 percent of people who ascend higher than 8,000 feet (2,400 meters) in a relatively short time span. It's caused by the lower levels of oxygen in the air at high elevations; your lungs can't take in as much oxygen as they're used to and your heart and lungs have to work harder to keep your blood oxygenated.
Symptoms of acute mountain sickness include dizziness, fatigue, nausea, headaches and difficulty sleeping. The problem usually goes away within a few days as long as you remain well hydrated (Non alcoholic drinks) and stay at the same altitude until the symptoms pass.
In Peru the traditional Coca leaf has being used since generations to avoid the symptoms of altitude sickness and most hotels and restaurants offer Coca tea or Coca leaves to their guests and for a good reason! We recommend to drink it! One sip, and you’ll note that coca has a pleasant, delicately herbal flavour similar to green tea. A few more sips and your head clears, the throbbing subsides and you can breathe again.
If you’re concerned about altitude sickness, it is a good idea to visit your doctor before your trip.