49 year old female, 5 8 , 211 pounds...overall healthy. Every once in a blue moon, I get a sudden severe case of the chills with shivering and chattering teeth...only lasts a few minutes and usually relieved by putting my hands under hot water and putting on a heavy robe or blanket. Is this just something that happens if the body is resetting it s thermostat, so to speak? No other symptoms...no lingering effects. Usually happens if temperature is a little cooler in apartment...last night I was watching tv covered by a blanket and when I got up to go to bathroom, I realize that it was a bit chilly in the apartment...and then I got the bad shivers. I really tense up when this happens...thought I would ask about it.