Perhaps the tumor or the scar tissue from the radiation is affecting his nervous system? the part of the brain that controls sensory perception of hot and cold? Anything like this is bothersome but probably not a cause for huge worry. When Andy had an audible clicking in his tumor area, no one seemed to care much. And it went away.
Brains! Can't live with 'em, can't live without 'em. Sorry, a little BTH. (Brain tumor humor.)
Sarah
mother of Andy 27 dx gbm/pnet 1/09