Metabolic & Cardiometabolic
chronic psychological stress causes systemic inflammation
In plain terms: Does stress drive real, measurable inflammation?
Yes — psychological stress measurably raises inflammatory markers (IL-6, CRP) via a well-characterised glucocorticoid-resistance pathway, robustly shown in stress and PTSD meta-analyses.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
The evidence (9)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Peruzzolo 2022 · Mol Psychiatry | meta-analysis | supports | high | Meta-analysis (54 studies) found PTSD associated with significantly elevated CRP, IL-6 and TNF-alpha versus controls. |
| Passos 2015 · Lancet Psychiatry | meta-analysis | supports | moderate | Meta-analysis and meta-regression found increased inflammatory markers in PTSD patients relative to healthy controls. |
| von Kanel 2006 · Am J Geriatr Psychiatry | observational | supports | low | Alzheimer caregiving stress combined with age predicted higher IL-6, CRP and D-dimer, consistent with premature frailty. |
| Jesuthasan 2025 · Brain Behav Immun | meta-analysis | supports | moderate | Meta-analysis found childhood adversity, a chronic stressor, associated with adult autoimmune disease, implicating durable immune dysregulation. |
| Cohen 2012 · Proc Natl Acad Sci U S A | mechanism | supports | high | Viral-challenge studies showed chronic stress induced glucocorticoid receptor resistance and greater proinflammatory cytokine production, a mechanistic pathway. |
| Renna 2018 · Depress Anxiety | meta-analysis | supports | moderate | Meta-analysis found anxiety, PTSD and OCD associated with elevated chronic inflammation markers including CRP and cytokines. |
| Parsons 2021 · Child Adolesc Ment Health | meta-analysis | mixed | moderate | Meta-analysis in children/adolescents found inconsistent associations between anxiety-based (stress) disorders and inflammatory markers. |
| Steptoe 2007 · Brain Behav Immun | meta-analysis | supports | high | Meta-analysis of 30 studies found acute psychological stress robustly raised circulating IL-6 and IL-1beta, with marginal effects on CRP. |
| Potier 2018 · Aging Clin Exp Res | observational | mixed | moderate | Systematic review of caregiving stress found frequently but inconsistently elevated pro-inflammatory biomarkers among caregivers. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.