What is Hand Arm Vibration Syndrome (HAVS) and how to prevent it Raynaud's phenomenon is a condition where small blood vessels in the fingers and toes suddenly narrow in response to cold or stress. This causes the classic color changes: white (reduced blood flow), Does this happen to your fingers when it's cold? This is Raynaud's phenomenon, a common condition that's usually triggered by cold temperatures, anxiety, or stress. The most common type of Raynaud's VIBRATION WHITE FINGER: THE INCURABLE CONDITION THAT GETS WORSE WITH AGE.