With the World Cup now in full swing, millions of fans are descending on stadiums and thousands of workers are facilitating the games, and many doctors warn that the risks of extreme heat extend far beyond the action on the field – especially at certain venues.

More than 1 in 3 World Cup matches face dangerously hot, humid weather. Here's how to protect yourself from heat illness.

MIAMI, June 17 : Players arriving in Miami for World Cup matches may find themselves battling more than just opposing teams, as sweltering heat and humidity threaten to turn the…