Red, White, and Blue
Named after a french physician, raynaud's is improper regulation of blood flow.
Pain and changes to the colors of the fingers and hand in response to cold (air conditioning, ice cubes, etc) or stress
occurs as follows: the fingers turn white as the blood vessels constrict, then turn blue as the oxygen
levels drop, then turn red upon rewarming. Usually benign, but see your doctor to be sure!