Ken Bob Saxton, in his book Barefoot Running, Step by Step, identifies what he calls B.R.E.S.: Barefoot Running Exuberance Syndrome. He refers to some of the pains one can get when getting too exuberant about barefoot running and overdoing it. Like everything else, you have to work up to barefoot running.
The same principle applies to acclimating to the cold. I’ve called that Acclimatization Inadequacy Syndrome.