Is this trip for a general visit, or an athletic event? If it's the former, I don't think you'll have much to worry about.

I can't say that I recall being at 11,000ft, but when I went to Lake Tahoe (elevation over 6000ft), the altitude was not really a factor until I went hiking. It just felt like I was being winded sooner than normal for the effort being put out.

I don't think you'll have any issues regarding your stoma, but you may want to see if an anti-nausea medication (i.e. gravol) will work for altitude.

Enjoy your trip!

It's Peru. Two of the places, Cusco and Puno are up at 11,000 and 12,500 ft and I have been reading about how the low pressure at that altitude can affect hydration (and maybe ballooning??).

Nothing athletic. Just walking and stairs.

I got some Diamox from my doctor and will be making sure I have water on hand.

balloning could be possible in quickly changing pressures, going from high pressure to low pressure fairly rapidly, similar to divers getting the bends.   slow pressure changes should equalize everything. 

Posted by: @dogtalkerer

↑

balloning could be possible in quickly changing pressures, going from high pressure to low pressure fairly rapidly, similar to divers getting the bends.

This is a good point. I assumed that @tim was talking about static high altitude, but yes, the likelihood of issues will happen with rapid elevation changes (i.e. on the plane).

Posted by: @tim

↑

It's Peru. Two of the places, Cusco and Puno are up at 11,000 and 12,500 ft

Wow! Honestly, that sounds amazing. I hope you have a great time!

When travelling, the biggest risk factor for ballooning or output changes, in my opinion, come with the change in diet at your destination and the timing of those meals (as they tend to differ from "regular" meal times at home.

Back to report, ballooning wasn't a noticable difference at high altitude (low air pressure). But dehydration definately is! I didn't hydrate properly when I got up one day (at 11,000 ft), had breakfast, and as we started out from the bus at one location, I vommited. Definately a hydration problem.

So, hydrate, and use hydration tablets when at high altitude! Very important!

@tim Thanks for the update! That's a shame about the dehydration, but it sounds like a learning experience.

Hopefully, you still had a great time!