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Background: Pain is a prevalent symptom in patients with advanced cancer. Recognition of prognostic factors associated with pain intensity, could help provide better assessment, leading to better pain management. Aim: identifying prognostic factors which could guide improvements on cancer pain classification. Design: a prospective observational study on chronic cancer pain, exploring the association between average mean pain intensity during a 28 days study follow-up and patients’ clinical and pain-related characteristics, including pain syndromes. To evaluate these associations, a mixed model was built. Setting/participants: Patients attending a Palliative Care and Pain Outpatient Clinic from May 2015 to June 2019 were screened. Patients with moderate to severe cancer pain who were already receiving or needed treatment with third step WHO ladder opioids were enrolled in the study. Data from 342 patients with at least one follow-up visit were analyzed. Results: Pain intensity decreased significantly for all patients during time ( p Conclusions: The recognition of specific pain syndromes may help to better classify cancer pain.