My son has it. It developed when he was a teen. He researched and had an experimental surgery where they cut a nerve to stop the problem and he was "cured." Seriously, usually this has to be done by cracking open your chest, major recovery. He flew to San Antonio with my husband, had the surgery, drove to Austin that night for dinner, got checked out by the doc the next morning and then flew home. They went in through his armpit and the temperature in his hands was like 20 degrees higher immediately after the surgery. Blue Cross paid for all of it, too.