Much of the U.S. is grappling with severely high temperatures and choking humidity this week. Here's what that means for your health.

A dangerous heat wave is tightening its grip on the East Coast, with the worst conditions arriving as millions prepare to celebrate the Fourth of July outdoors.

Long hours outdoors, day drinking, and World Cup matches are among the factors raising the risks of heat-related illness, as hot weather spreads across the eastern US.