Raynaud’s Syndrome also known as Raynaud’s phenomenon or Raynaud’s disease, is a condition where small blood vessels in the extremities—typically fingers and toes—undergo excessive constriction (vasospasm) in response to cold temperatures or stress.

This leads to reduced blood flow, causing affected areas to change color: turning white (pallor), then blue (cyanosis) due to low oxygen, and finally red (rubor) as blood flow returns, often accompanied by numbness, tingling, pain, or a ‘pins and needles’ sensation.