Raynaud’s (ray-NODES) is named for the French physician Maurice Raynaud, who first recognized the condition in 1862. The disease causes an interruption of blood flow to the fingers, toes, nose, and/or ears when a spasm occurs in the blood vessels of these areas. Spasms are caused by exposure to cold or emotional stress. Typically, the affected area turns white, then blue, then bright red over the course of the attack. There may be associated tingling, swelling, or painful throbbing. The attacks may last from minutes to hours. In severe cases, the area may develop ulcerations and infections, which can lead to gangrene.