Sometimes fingers turn white or blue. This can happen when it is cold. It can also happen when you feel stressed. Your fingers might feel numb or hurt. Then they turn red and feel warm. 
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Raynauld.jpg
Hand with Raynaud's Syndrome.jpg
Nipple-blanching.jpg
Raynaud's Disease.jpg
A thermal image demonstrating the loss of...
Consensus Diagnostic Criteria Raynaud's...
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Content adapted from Wikipedia
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Readability: FK 14.6
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Vital Level 5