Hillary Clinton fainting at the 9/11 memorial this weekend has raised concern and speculation over possible causes. There are three causes of fainting.
Are the Mountains Killing Your Brain?
Alarming new science shows that thin air can wreck brain cells—at lower altitudes than you’d think. Here’s how to protect yourself.
“YOU HAVE TO BE poco loco to be a climber,” says Dr. Nicholás Fayed. A neuroradiologist at the Clinica Quirón de Zaragoza, in northern Spain, Dr. Fayed leads me into his office and pulls out a collection of MRI images. They’re brain scans, taken from amateur and professional mountain climbers after they came back from major expeditions, and the results aren’t pretty.
“Atrophy of the frontal lobes,” Fayed says, pointing to a black-and-white slice of brain on one MRI. The frontal cortex—the region just behind the forehead that handles higher-level mental functions—looks like a piece of dried fruit. This kind of damage can leave patients with an impaired ability to plan, focus, and make complex decisions. And it’s permanent…