Adverse Effects of Mindfulness-Based Practices: A Structured Narrative Review

Abstract

Mindfulness-based practices (MBPs) have spread from Buddhist contexts to clinical healthcare programs and onward to mass consumer use, reaching tens of millions in the United States alone. Yet these practices traveled without the qualified guidance, interpretive frameworks, and integration support of their original contexts, and app-based, workplace, and school delivery offer no equivalent. This narrative review synthesizes peer-reviewed evidence on the nature, prevalence, risk factors, and proposed mechanisms of MBP adverse effects. The corpus surfaces a seeming prevalence paradox. At first glance, occurrence ranges from 0 to above 90%. On inspection, 0 marks attributable serious adverse events in Mindfulness-Based Stress Reduction and Mindfulness-Based Cognitive Therapy trials, the 90%, unusual or mixed-valence experiences in broader samples. More specified ranges then emerge, such as 6-14% for lasting effects with impairment. What is measured shapes what is reported. 84% of those trials report no adverse-event monitoring at all. Effects include anxiety, depressive episodes, traumatic re-experiencing, and dissociation. Trauma history, psychiatric vulnerabilities, repetitive negative thinking, retreat participation, and deconstructive practices are associated with elevated risk. Proposed mechanisms have not yet converged. The evidence base reveals inconsistent definitions, missing standardized instruments, and systematic underreporting. Implications for research and practice (e.g., informed consent, risk screening, pathways to support) are discussed.