[Psoriasis comorbidities].

Psoriasis is a chronic inflammatory skin disease affecting 2-4 % of Central European population. Nowadays, we know that psoriasis is not limited to the skin but is connected with several comorbidities like, psoriatic arthritis (around 25 %), Crohn's disease, ulcerative colitis, Bechterev, non-alcoholic liver steatosis, psychiatric disorders and mainly diseases of the so called metabolic syndrome, like diabetes mellitus type 2, arterial hypertension or dyslipidemia. In the last years, new information is arising which connect psoriasis with sleep apnoe and chronic obstructive pulmonary disease.