According to NHS Choices the condition occurs because your blood vessels go into a temporary spasm which blocks the flow of blood. This causes the affected area to change colour to white, then blue and then finally red as the blood flow returns.
According to NHS Choices Raynaud's is thought to affect up to 10 million people in the UK. Only a small proportion of those affected will be admitted to hospital.
Raynaud's is more common in women than men, and can affect people of all age groups (as shown by HES data in the graph below).
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HES data for Raynaud's (diagnosis code I73.0 in ICD-10) show that:
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More information on this topic is available from NHS Choices here.
A finished consultant episode (FCE) is a continuous period of admitted patient care under one consultant within one healthcare provider. FCEs are counted against the year in which they end. Figures do not represent the number of different patients, as a person may have more than one episode of care within the same stay in hospital or in different stays in the same year.