I was exhibiting at the Philadelphia Inquirer Travel Show this weekend and one of the most common concerns brought up by people interested in a tour to Peru and Machu Picchu was the issue of altitude sickness, also known as soroche or AMS (Acute Mountain Sickness). No matter how you slice it, 10% of all travelers to Peru and Machu Picchu will get it, but in this blog post I will give my tips on how to avoid it and how to handle altitude sickness if you do indeed get it while on a tour to Peru.