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), Learn the 5 Tiers of Vibration Health Surveillance Protecting Worker's Health Vibration Exposure Health Matters Occupational Health It's Raynaud's Awareness Month. Raynaud's is a condition where the small blood vessels of the fingers become narrow, causing fingers to change colour and become painful. Read about how to treat the Premom Fertility Lubricant: Water Based & Glycerin Free Hand Arm Vibration Syndrome