It happens in all kinds of heat, sun, warm room, exercise, emotion, etc. It is downright life changing. I am a 71 year old recreational
tennis player and I can tell you that since this began in Sep 2007 I have not played tennis ...bummer. I have taken a battery of tests and when the neurologist gave up on me he sent me to a neurologist at the Johns Hopkins Hospital in Baltimore. This new neurologist is as baffled as all the other doctors I have seen.