[Definition and terminology of Raynaud's syndrome].

Physicians have for a long time used different definitions, terminology and differential diagnoses for Raynaud's syndromes, which has resulted in diagnostic, therapeutic and prognostic problems. In order for difficulties of understanding to be prevented, the terminology should be restricted to the most common terms in international use, i. e. primary, secondary and suspected secondary Raynaud's syndrome. The characteristics of those three forms of Raynaud's syndrome are outlined.