Symptoms of Raynaud's phenomenon occur because little to no blood reaches the affected body parts. During a Raynaud’s attack, the affected areas typically turn white then blue for a period of time, while feeling numb, cold or painful. When blood flow returns, these areas may turn red, throb, tingle and burn.
Raynaud’s attacks can last from a few seconds to several hours. Their occurrence can range from daily to weekly. In rare instances, severe Raynaud’s attacks can cause skin sores or gangrene, which occur when tissue dies.