As others have said, it depends on the cause of the itch. I have an alpha-galactose allergy. This is sort of a food allergy: beef and lamb, probably venison a

As others have said, it depends on the cause of the itch. I have an alpha-galactose allergy. This is sort of a food allergy: beef and lamb, probably venison and to a lesser extent pork, trigger it. But unlike other food allergies, this doesn't hit me at the time, but maybe six or eight hours later. While I can get hives whenever I eat too much of that kind of meat (which of course I try to avoid), the best guarantee that it will happen after such a meal is heat on my skin. Initially, this happened several times when I stopped running after an hour or so, and my body was no longer cooled by the breeze and by breathing hard; but I've also gotten hives when taking a hot shower hours after eating beef, or sleeping under more blankets than I really need. BTW, the alpha-gal allergy is transmitted by bites of the Lone Star Tick. You don't get hives from the bite, but it somehow makes you allergic to beef. And I'm not making this up--it is well documented: https://www.mayoclinic.org/diseases-conditions/alpha-gal-syndrome/symptoms-causes/syc-20428608 https://www.mayoclinic.org/diseases-conditions/alpha-gal-syn...; see also https://en.wikipedia.org/wiki/Exercise-induced_anaphylaxis https://en.wikipedia.org/wiki/Exercise-induced_anaphylaxis on the link between exercise and hives.