The ageing of populations and the high prevalence of chronic diseases are risk factors for suicide, as well as the increasing prevalence of several mental disorders. The continuing growth of several other risk factors for suicide makes it possible to predict an increase in suicide rates worldwide unless resolute action is undertaken to prevent suicidal behaviour. A major problem in that respect is that, in many countries, suicide is not seen as a major public health problem despite its frequency and the severity of its consequences. A textbook bringing together current knowledge about suicide, its causes and its prevention is a precious tool for public health efforts and for clinicians' daily work and provides useful information from psychological, sociological and cultural perspectives which will help health professionals and provide them with data that they can use in developing proposals for action.