Raynaud' s phenomenon is a condition in which cold temperatures or strong emotions cause blood vessel spasms that block blood flow to the fingers, toes, ears, and nose.
Raynaud's phenomenon can be associated with other conditions. This is called secondary Raynaud's phenomenon. Most people with the condition are over age 30.
Common causes are:
Raynaud's phenomenon also occurs without another disease, medication, or cause. This is called primary Raynaud's phenomenon. It most often begins in people younger than age 30.
Bakst R, Merola JF, Franks AG Jr., Sanchez M, Perelman RO. Raynaud's phenomenon: pathogenesis and management. J Am Acad Dermatol. 2008;59:633-653.
Ferri FF, ed. Ferriâ€™s Clinical Advisor 2011. 1st ed. Philadelphia, Pa: Mosby Elsevier; 2010.
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