[Comorbidities in psoriasic arthritis].

Psoriatic arthritis occurs almost exclusively together with psoriasis of the skin. It seems useful therefore for the practitioner to consider the two of them as manifestations of one "psoriatic disease". This pragmatic approach is more contemporary, particularly since it is increasingly clear that the "psoriatic disease" goes beyond damage to the skin and joints. The most important "comorbidities" associated with psoriatic disease are presented here; especially the cardiovascular diseases as well as their risk factors, namely smoking, obesity, and the metabolic syndrome. Moreover, infections, osteoporosis and neoplasia are to be considered.