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Excedrin brand migraine medication contains caffeine, in addition to acetaminophen and aspirin, because it helps constrict blood vessels in a process called vasoconstriction, enhancing pain relief.

Ice, however, causes the opposite phenomenon: vasoconstriction, which causes blood vessels to narrow.

One such mechanism is vasoconstriction, which is when the muscles in blood vessel walls narrow to prevent heat loss, says cardiologist Laxmi Mehta of the Ohio State University Wexner Medical Center.

We agree that the tannins in tea have astringent properties, which means they can cause vasoconstriction and enhance blood clotting.

The blood vessels in my hands are being closed off - known as vasoconstriction - in order to keep my warm blood for my critical organs.