[Raynaud's phenomena of occupational origin].

Raynaud's phenomenon must systematically lead to the research of a professional cause, mainly if the patient is a manual worker. The most frequent professional cause is vibrations disease which involves different occupations, especially woodcutters. In this disease, Raynaud's phenomenon may be associated with neurological or rheumatic manifestations. Prevention relies on tool improvement and reduction of exposure-time. The more uncommon hammer's syndrome is characterized by the onset of a terminal cubital artery aneurysm, resulting from repeated trauma on the palm of the hand. Raynaud's phenomenon is severe, with frequent trophic complications related to embolic migration towards digital arteries. Improved prevention explains that acrosyndromes related to vinyl chloride exposure are now very rare. Finally, a Raynaud's phenomenon may be the first symptom of a systemic sclerosis induced by silicate exposure.