ARC - Raynaud's Phenomenon

If you have Raynaud's phenomenon your hands, and sometimes your feet, change colour when exposed to cold conditions. Typically the hands go white, then blue, and then red. People with Raynaud's phenomenon often complain of cold feet as well, and the tip of the nose may also feel uncomfortable. Raynaud's phenomenon can also occur as a result of using vibrating machinery, when it is called 'vibration white finger' or 'hand-arm vibration syndrome'. It can also sometimes occur as a side-effect of certain drugs such as beta-blockers which are used in the treatment of raised blood pressure and angina.

The link address is: http://www.arc.org.uk/about_arth/booklets/6052/6052.htm