Background: Despite limited empirical support, chronic pain has traditionally been defined mainly on the basis of its duration, which takes no account of the causative mechanisms or its clinical significance. Scope: For this commentary on current pain management practice, the CHANGE PAIN Advisory Board considered the evidence for adopting a prognostic definition of chronic pain. The rationale underlying this approach is to take psychological and behavioural factors into account, as well as the multidimensional nature of pain. Measures of pain intensity, interference with everyday activities, role disability, depression, duration and number of pain sites are used to calculate a risk score, which indicates th Findings: When this method was compared with the number of pain days experienced over the previous 6 months - in patients with back pain, headache or orofacial pain - it was a better predictor of clinically significant pain 6 months later for all three pain conditions. Further evidence supporting this approach is that several factors other than the duration of pain have been shown to be important prognostic indicators, including unemployment, functional disability, anxiety and self-rated health. The use o Conclusion: The implementation of a prognostic definition and wider adoption of integrated care could bring significant advantages. However, these measures require improved training in pain management and structural revision of specialist facilities, for which political support is essential.