Raynaud’s phenomenon is when blood vessels in the fingers constrict or narrow in response to cold or emotional stress. The resulting disruption in blood circulation causes a series of color changes in the skin: white, blanched or pale, when circulation is reduced or stopped; blue as the affected part lacks oxygen from decreased blood flow; and then red or flushed as blood flow returns. Raynaud’s phenomenon affects about 4% of the general population. It is present in over 90% of patients with scleroderma. “Crises” can last anywhere from a few minutes to a few hours and tend to worsen with time. Although, there is currently no cure for Raynaud’s phenomenon, many common-sense preventative measures can be taken by those affected. The most obvious is minimizing exposure to cold, wear gloves or mittens and avoid smoking. A number of different medications can also help to prevent, reduce the frequency and minimize the effects of Raynaud’s phenomenon.