Chronic Pain and the Risk of Dementia: A Systematic Review and Meta-Analysis

Clinical Snapshot

Key Findings

• P Value: Not explicitly reported in abstract; implied statistically significant given CI excludes 1.0

• Effect Size: Pooled Risk Ratio (RR) = 1.28 — representing a 28% increased risk of dementia in individuals with chronic pain

• Primary Outcome: Risk of incident all-cause dementia in individuals with chronic pain versus those without chronic pain, pooled from 25 independent cohort studies (N = 2,091,835)

• Nnt Or Sensitivity: Hazard ratios from individual studies treated as equivalent to risk ratios (assuming low event rates). Subgroup RRs: migraine, headache, arthritis-related pain, and widespread pain each associated with increased dementia risk; vascular dementia subtype not significantly associated. Association significant in Asian populations but not in American or European populations. ICD-based but not DSM-based diagnostic criteria yielded significant associations. I² = 91% indicating very high between-study heterogeneity.

• Confidence Interval: 95% CI: 1.18–1.38

Clinical Application

The findings do not yet support specific clinical interventions for dementia prevention in chronic pain patients. However, they reinforce the importance of comprehensive chronic pain management, including addressing modifiable dementia risk factors (depression, sleep disorders, physical inactivity, cardiovascular risk) that frequently co-occur with chronic pain. Clinicians should maintain cognitive surveillance in older patients with longstanding chronic pain. In Australia, chronic pain affects approximately 3.4 million people (Deloitte Access Economics, 2019), representing a substantial population-level concern. The RACGP recommends a biopsychosocial approach to chronic pain management, which aligns with addressing the multifactorial dementia risk factors identified in this review. PBS-listed analgesics including opioids and NSAIDs carry their own cognitive risk profiles that were not disentangled in this meta-analysis — a critical gap for Australian prescribers. The TGA has not issued specific guidance linking chronic pain management to dementia prevention. The non-significant findings in Western populations (America and Europe) suggest Australian clinicians should exercise caution before extrapolating the pooled RR to their patient populations. Dementia Australia and the National Dementia Action Plan 2024–2034 emphasise modifiable risk factor reduction; chronic pain management may warrant inclusion in future risk reduction frameworks pending stronger evidence. Community-dwelling adults with established chronic pain conditions, particularly those with migraine, inflammatory arthritis, or widespread pain syndromes. The evidence is most applicable to Asian populations based on subgroup findings; applicability to Western populations including Australians is uncertain.

Abstract

BACKGROUND: The relationship between chronic pain and dementia risk has been extensively studied, but findings remain inconclusive. We conducted an updated meta-analysis to synthesize evidence from recent large-scale cohort studies. METHODS: Two authors independently and systematically searched PubMed, Web of Science, Embase, Cochrane Library, and Chinese National Knowledge Infrastructure for cohort studies published through April 2025, with a minimum follow-up of one year. Hazard ratios (HRs) were considered equivalent to risk ratios (RRs) assuming low event rates. Random-effect models pooled risk ratios (RR) with 95% confidence intervals (CI). Subgroup analyses and meta-regression explored heterogeneity. RESULTS: Of 3,823 publications, 30 studies met the inclusion criteria. After excluding five studies with overlapping populations, 25 studies involving 2,091,835 participants were pooled in the primary analysis. Individuals with chronic pain had a 28% higher dementia risk (RR = 1.28, 95% CI = 1.18-1.38). Heterogeneity was high (I²=91%). Subgroup analyses showed migraine, headaches, arthritis-related pain, and widespread pain were associated with increased risk. The association was significant in Asia but not in America or Europe, and when using ICD (but not DSM) criteria. Chronic pain increased the risk of Alzheimer's disease and non-vascular dementia, but not vascular dementia. Study quality, region, measurement methods, and pain types influenced the relationship. Pain type was a source of heterogeneity. CONCLUSIONS: In this meta-analysis of cohort studies, chronic pain was associated with an increased risk of dementia. Due to the observational nature of the included studies and high heterogeneity, this association should not be interpreted as causal. Further research is needed to determine whether pain management can mitigate dementia risk.

References

1. 1.Lin, Q., Qiu, N., Wang, X., Wei, Y. B., & Liu, J. J. (2026). Chronic pain and the risk of dementia: A systematic review and meta-analysis. Current Pain and Headache Reports. https://doi.org/10.1111/head.13215