[The epideiology of postoperative pain].

Postoperative pain, as all types of pain, is a complex phenomenon including sensory, emotional and behavioural factors. The incidence and severity of postoperative pain is very variable between patients and is rather unpredictable. Patients characteristics as well as the types of surgery and anaesthesia will be of importance. Health professionals have a major role to play for improving effectiveness of pain management as well as safety.