Pain beliefs and their relationship with pain, psychological distress and catastrophizing in individuals with Parkinson's disease.

In Parkinson's disease (PD), a large number of individuals are confronted with pain. This issue has been receiving increasing attention in literature in recent years, as the complexity of pain in this disease makes its evaluation and treatment challenging. However, psychological variables related to the pain experience have received limited attention, especially when it comes to the exploration of beliefs regarding pain which, to our knowledge, remains unexplored in PD. Pain beliefs are defined as a subset of a patient's belief system which represents a personal understanding of the pain experience. Four dimensions of pain beliefs have been isolated in literature: mystery, pain permanence, pain constancy and self-blame. Thus, the goal of this study was first to describe pain beliefs in individuals with PD and second, to explore the relationships between pain beliefs and clinical and psychological variables. One hundred and sixty-nine international individuals with PD completed an online survey with socio-demographic and medical data. Participants completed self-report instruments to assess their pain (King's Parkinson's Disease Pain Questionnaire, McGill Pain Questionnaire and Brief Pain Inventory), psychological distress (Beck Depression Inventory, short-form and Parkinson Anxiety Scale), pain catastrophizing (Pain Catastrophizing Scale) and pain beliefs catastrophizing (Pain Beliefs and Perception Inventory). The study's findings revealed that most participants' beliefs are marked by the dimension of permanence, suggesting that individuals with PD perceive the pain experience as chronic and enduring. Meanwhile, pain is minimally perceived as constant, mysterious, or a source of guilt. Our finding concerning the permanence dimension deserves specific attention: even though this belief is prevalent in our population, it is not, or only weakly, associated with an impact on mood or pain catastrophizing. These results bring forth several hypotheses for understanding, highlighting the role of acceptance, and offer new perspectives toward improving clinical practices in terms of assessing and managing pain in PD.