Raynauds disease and phenomenon are problems with the blood vessels. It causes blood flow problems to the fingers ears, nose, and lips.

Constriction of Blood Vessels
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Raynauds Disease (primary Raynauds) is the most common form. It does not requires the presence of any other medical conditions.

Raynauds Phenomenon (secondary Raynauds) is the more severe form. It occurs along with other medical conditions such as:

Blood vessels normally narrow in response to cold temperatures or emotional stress. Raynauds is an exaggerated response to these triggers. The narrow blood vessels make it difficult to get enough blood flow to certain areas of the body. Fingers are affected most often.

It is not known what causes this abnormal reaction, but it is probably related to a problem of the nervous system. Secondary Raynauds is believed to be caused by the associated disease.