The bacteria living in your gastrointestinal tract may play a surprising role in how much altitude sickness affects you.

At last, you’ve arrived in Cuzco, Peru — you’re ready for your dream trek to Machu Picchu. There’s just one problem: You can barely catch your breath, your stomach is churning and, in the morning, ...

Ever dash through the airport in Salt Lake City? Worse yet, have you ever run a 5K in Denver? Even if you live at high altitude, you’re bound to be more winded and considerably slower than you would ...

They call it the “death zone.” It’s a stretch of Mount Everest that’s about 26,000 feet up and is strewn with something like 200 corpses permanently frozen into the landscape —a warning to other ...

The Estadio BBVA in Monterrey is actually closer to sea level than the two other Mexican host cities Julio Cesar Aguilar/AFP via Getty Images It was 1969 and Joao Saldanha was on the search.

The term “high-altitude illness” is used to describe the cerebral and pulmonary syndromes that can develop in unacclimatized persons shortly after ascent to high altitude. Acute mountain sickness and ...