The Placebo Effect in Pain Therapies

Author:

Colloca Luana1

Affiliation:

1. Department of Pain and Translational Symptom Science, School of Nursing; Department of Anesthesiology, School of Medicine; and Center to Advance Chronic Pain Research, University of Maryland, Baltimore, Maryland 21201, USA;

Abstract

Pharmacological strategies for pain management have primarily focused on dampening ascending neurotransmission and on opioid receptor–mediated therapies. Little is known about the contribution of endogenous descending modulatory systems to clinical pain outcomes and why some patients are mildly affected while others suffer debilitating pain-induced dysfunctions. Placebo effects that arise from patients’ positive expectancies and the underlying endogenous modulatory mechanisms may in part account for the variability in pain experience and severity, adherence to treatment, distinct coping strategies, and chronicity. Expectancy-induced analgesia and placebo effects in general have emerged as useful models to assess individual endogenous pain modulatory systems. Different systems and mechanisms trigger placebo effects that highly impact pain processing, clinical outcomes, and sense of well-being. This review illustrates critical elements of placebo mechanisms that inform the methodology of clinical trials, the discovery of new therapeutic targets, and the advancement of personalized pain management.

Publisher

Annual Reviews

Subject

Pharmacology,Toxicology

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