It's 10,000 to 12,000, it's not one of the 14-ners. Not everyone is the same, so I'd not tell you to not worry about everything since everyone else I saw didn't have problems. I've watched all kinds of people be affected, in different places on the globe. If worried, the simple pre-trip solutions are to eat heavy Italian or Spanish food with an overload of carbs and you drink a lot of water prior to going. Also, carry a big bottle of water, with you. You can also take some getorade with you for later. The heavier you are, the greater your portions. If you sweat a lot, bring a big spare of water. Also, bring the headache medicine of your choice, in case.