The goal of this observational study is to compare different treatment options in a chronic pain population. The main questions it aims to answer are: * What is the effectiveness of the different therapy options in the pain center of Sint-Lucas on outcomes related to pain and disability? * What are predictive factors for the different therapy options in the pain center of Sint-Lucas? Which factors predict improvement in pain related outcomes? Participant data will be gathered as part of their routine care. They can be advised to 4 different treatment options: * Consultations with the pain specialist * Interventions by the pain specialist (infiltrations, denervations) * Baxter therapy * Interdisciplinary treatment Researchers will compare patients with different dominant pain mechanisms to see which treatment are most effective for which dominant pain mechanisms.