Medical Effects Of Extreme Cold: Why It Hurts And How To Stay Safe

Frank Lettiere’s eyebrows and eye lashes froze after his walk along Lake Michigan’s Chicago shoreline Wednesday. Frostbite warnings were issued for parts of the U.S. Midwest, as outside temperatures plunged.

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Updated Thursday at 1:33 p.m. ET

Parts of the Dakotas and Minnesota dived to minus 27 F or lower this week, according to the National Weather Service. That is not just uncomfortable — that kind of cold can be dangerous and even deadly, especially if you don’t take precautions regarding how long you’re out and how you dress.

“I’ve seen patients develop frostbite within approximately 10 to 15 minutes after being exposed to these extreme temperatures,” Dr. Jeff Schaider tells NPR’s Ari Shapiro on All Things Considered. Schaider is chief of emergency medicine at the John H. Stroger, Jr. Hospital in Chicago and head of emergency medicine at Cook County Health.