Altitude sickness is triggered by a rapid decline in air pressure and air oxygen levels at higher altitudes. By allowing your body to adapt to lower oxygen levels (using the methods outlined in this article), you can decrease the chances of developing altitude sickness, or at least lessen your symptoms. If you want to prepare yourself for an upcoming hike at altitude, I recommend checking out this podcast with Dr. Rich Berkowitz, a chiropractor from North Carolina who used the same LiveO2 system I have to prepare for a trek to Mount Everest base camp.