Effectiveness of a Multidisciplinary Treatment for Patients With Chronic Low Back Pain

PAINDOC is a treatment program that includes 4 disciplines that, separately, have demonstrated their effectiveness in the treatment of chronic low back pain: education in pain neuroscience, therapeutic education (Empowered Relief®), psychotherapy based on cognitive-behavioral therapy and therapeutic exercise. The primary objective of the study is to evaluate the effectiveness of the PAINDOC multidisciplinary treatment program in reducing pain intensity and improving quality of life in persons with chronic low back pain referred to the pain unit of the Hospital Clinic of Barcelona, compared to usual care treatment. As secondary objectives, the present study aims to evaluate the effect of the PAINDOC program on: * The reduction of pain-related disability. * The reduction of pain catastrophizing. * The improvement in perceived social support. * The improvement in perceived autonomy (self-efficacy). * The reduction of analgesic, anti-inflammatory and adjuvant analgesic medication. The main questions it aims to answer are: * Is the proposed multidisciplinary treatment effective in improving pain-related outcomes? * Is the proposed multidisciplinary treatment effective in reducing analgesic medication? Participants will receive either usual care (pharmacological control) or the PAINDOC program, which consists of 7 multidisciplinary sessions within 2 months. There will be one therapeutic education session called Empowered Relief®, 2 pain neuroscience education sessions, one pain psychology session and 3 therapeutic education sessions. Besides, participants will be assessed using written questionnaires before treatment, at 3 months and at 6 months. Researchers will assess the effectiveness of the multidisciplinary treatment group comparing both groups to see if there is any difference in several pain-related outcomes.