Why Do We Get Cold Feet But Hot Headaches?

Imagine your body is a cozy house. When it gets cold outside, the house keeps all its warmth in the living room (your heart and brain) so you stay warm inside. To do this, it turns down the heat to the rooms at the edge, like your hands and feet. This makes your extremities chilly while your head stays toasty.

Your blood acts like hot water pipes. When you are relaxed, these pipes are wide open, letting lots of warm blood flow everywhere. But when you shiver or feel stressed, tiny muscles around the pipes squeeze tight. This is called vasoconstriction. It saves heat for your vital organs.

Your head has many sensitive nerves. When those blood vessels in your scalp swell up (the opposite of squeezing), they push against the nerves. Your brain interprets this pressure and extra warmth as a hot, throbbing pain. So, while your toes might be freezing because the pipes are narrow, your head feels like a furnace because the pipes there are bursting with warm blood.