Raynaud's phenomenon (RP) is characterised by vasospasm that causes digits to change colour to white (pallor) from lack of blood flow, usually brought on by cold temperatures.
Affected areas subsequently turn blue due to de-oxygenation and/or red due to reperfusion. It can be a painful condition and can lead to complications.
Janet Pope, Professor of Medicine, Division of Rheumatology, Department of Medicine, University of Western Ontario, gives a clinical overview of the condition.
For more on Raynaud's phenomenon, visit BMJ Best Practice: bestpractice.bmj.com/topics/en-gb/193
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