Why do you always feel cold when you get tired?
In: Biology
Assuming you arent talking about directly after physical exertion (excercise/manual labor), then the cold from being tired is due to low blood flow. The slower your blood flow, the less warmth is being spread from your core to your extremities. Extremities (hands, ears, nose, toes, etc) have a higher rate at which they lose warmth compared to legs/torso, which cools you off faster, making you feel colder as a result. An easy (depending on why) way to warm up could be to stretch or other movements that get the blood flowing.
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