Hypothermia
If you’re not warm yourself up and you just can’t stop shivering, that’s when hypothermia strikes. The NWS explains hypothermia as a decrease in your body temperature below 95 degrees Fahrenheit. Around 98.6 degrees is considered normal.
“The lower core body temperature goes, the more severe the symptoms,” Dr. Miller says. Shivering can become quickly uncontrollable. “As hypothermia progresses, there can be a very dangerous lack of judgment that can lead people to make bad decisions and not get out of the cold,” he says.
If you surprise someone having hypothermia, you should call 911 immediately, because, without treatment, hypothermia is fatal.
Headaches
Don’t ignore your headaches! You can have fluctuations in barometric pressure that can trigger migraine or headaches in those who are freezing out. A type of cold stimulus headache is brain freeze and this appears as a response to cold over the palate.