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Raynaud (RAY-node) syndrome is a reversible condition in which the fingers or toes start throbbing and turning a whitish or blue color because a contraction (vasospasm) of the small arteries has interfered with blood flow. It typically occurs when the body parts are exposed to cold temperatures or stress.
There are two types of Raynaud syndrome:
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Primary Raynaud syndrome is by far the more common type and has no known cause, but contributing factors include cold weather and emotional stress. It is estimated to occur in about 5 to 10 percent of nonsmokers and is much more common in women than men.
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Secondary Raynaud syndrome is the result of a known underlying condition, such as connective tissue disorders (e.g., scleroderma or lupus), nervous system diseases or certain occupationally related disabilities.
It is important to understand that merely cold hands and feet are not Raynaud syndrome. It also should not be confused with frostbite. The symptoms of the condition vary with the duration and severity of the blood vessel spasms. In most cases, the skin changes color and there is a feeling of numbness. As blood flow returns, the skin tone changes back to normal and there is often a tingling sensation. These symptoms are caused by the rapid constriction of small arteries in the extremities, especially the fingers, although Raynaud can also occur in the nose and ears. Attacks can be triggered by cold, stress or brought on for no apparent reason.
People who have experienced what appears to be Raynaud syndrome are encouraged to see their physician to confirm the diagnosis and, if necessary, to get treatment. Most people need only to make minor lifestyle changes. In some cases, however, vasodilators may be prescribed to keep the blood vessels from constricting. | 
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