A meta-analysis of 23 studies found no overall association between chronic pain and increased risk of cancer mortality or incidence, though some site-specific analyses suggested potential increases for breast, prostate, and lung cancers.
- Meta-analysis of 10 studies showed no link between chronic pain and cancer-related mortality (HR 1.00, 95% CI 0.97-1.04)
- Some individual studies suggested higher incidence for breast (SIR 2.12-4.8) and prostate (SIR 1.49-5.59) cancers
- Methodological challenges including reverse causation and confounding factors limit conclusions
How this compares to prior research
Experimental studies have suggested that pain may influence cancer development, prompting researchers to investigate whether this relationship exists in human populations. Previous epidemiological evidence on the association between chronic pain and cancer risk has been inconsistent and limited by methodological challenges. This systematic review aimed to synthesize available evidence specifically for chronic pain with minimal or non-inflammatory features.
Chronic pain prevalence globally, 1990–1999
Key findings
- Meta-analysis of hazard ratios from 10 studies showed no association between cancer-related mortality and chronic pain (HR 1.00, 95% CI 0.97-1.04)
- Site-specific analyses suggested chronic pain may be associated with higher breast cancer incidence (SIR 2.12-4.8) and prostate cancer incidence (SIR 1.49-5.59)
- Lung cancer mortality showed increased risk in chronic pain patients (MRR 3.09, 95% CI 1.45-6.62)
What this means in practice
- Discuss any chronic pain concerns with your doctor without assuming it increases overall cancer risk
- Continue recommended cancer screenings regardless of chronic pain status
- Note that site-specific risks for breast, prostate, and lung cancers require further high-quality research
Frequently asked questions
Does chronic pain increase your risk of getting cancer?
Overall, the meta-analysis found no association between chronic pain and increased cancer incidence or mortality. However, some individual studies suggested potential increases for specific cancer types like breast and prostate.
Why is it hard to study the link between pain and cancer?
Researchers face challenges including reverse causation (undetected cancer causing pain rather than pain causing cancer) and confounding factors like opioid use that make it difficult to establish clear relationships.
Which cancers showed the strongest association with chronic pain?
Site-specific analyses suggested potential associations with breast cancer incidence, prostate cancer incidence, and lung cancer mortality, though overall evidence remains limited and methodologically challenged.
Key terms explained
Hazard ratio (HR)
A measure comparing the rate of an event (like death) between two groups over time; HR of 1.0 means no difference.
Standardized incidence ratio (SIR)
The ratio of observed cancer cases to expected cases in a population; values above 1.0 indicate higher than expected incidence.
Reverse causation
When undetected cancer causes pain rather than pain causing cancer, making it difficult to determine true cause-and-effect relationships.
Source: Risk of cancer incidence and mortality in patients with chronic pain: A systematic review and meta-analysis. · DOI: pii: 32. doi: 10.1007/s10555-026-10341-2
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