Raynaud's phenomenon. A practical approach to a common problem.

: Raynaud's phenomenon is a common condition that affects about 5 per cent of the population, although not all patients affected seek medical attention. At present it is useful to categorize the condition as either primary or secondary. In most instances the diagnosis of Raynaud's phenomenon is straightforward, however it may present diagnostic and therapeutic difficulties. This review concentrates on distinguishing between primary and secondary causes of Raynaud's phenomenon, its investigation and its management.