Metabolic & Cardiometabolic
PCOS increases chronic inflammation
Part of: • PCOS
📅 Last reviewed: 2026-07-15 ⓘ
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
What the evidence shows
PCOS is associated with elevated low-grade inflammation (CRP).
The evidence (9)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Jin C, Xu Y, Xu L, Zhang N, Zhou C, Shen Y, Pan J 2026 · Journal of ovarian research | observational | supports | moderate | PCOS women had significantly elevated ESR vs controls across ALL age/BMI strata; higher hyper-ESR (>20mm/h) prevalence; low discriminative AUC for PCOS. |
| Butler AE, Moin ASM, Begam HH, Waris S, Azeez JM, Sathyapalan T, Atkin SL, Brennan E 2025 · Int J Mol Sci | observational | mixed | moderate | Case-control, 24 non-obese non-insulin-resistant PCOS vs 24 age/BMI-matched controls (Hull IVF clinic): CRP 2.8 +/- 2.6 vs 2.3 +/- 2.34 mg/L, 'BMI, insulin resistance, and CRP did not differ' between cohorts, but 'The alternative pathway of the complement protein system was overexpressed in PCOS' - C3a 534 vs 415 RFU (p=0.007), C5a 14,729 vs 11,343 (p=0.02), C3 p=0.002. CRP correlated with BMI within PCOS (r=0.52). Two-way on inflammation: canonical CRP null (small n), complement anaphylatoxins up. |
| Buia V, Catellani C, Croci S, Righi B, Morini D, Falbo AI, Nicoli A, De Fanti A, Belloni L, Aguzzoli L, Villani MT, Sartori C, Street ME 2026 · Frontiers in endocrinology | observational | supports | low | HMGB1 increased in PCOS vs controls overall; in the BMI-matched under/normal-weight (<25) stratum, IGF-II and IGFBP-4 still lower and IGFBP-7 higher in PCOS vs controls. |
| Atheeb AK, Hussein SZ 2026 · International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics | observational | supports | low | Serum HMGB1, sTLR4, and IFN-b significantly elevated in PCOS vs controls, consistent with low-grade inflammation (no BMI-matching stated). |
| Alataş H, Arslan N, Keskin L, Ağralı C 2026 · Diabetes, metabolic syndrome and obesity : targets and therapy | observational | supports | low | NLR elevated in PCOS vs controls (2.09 vs 1.63); HOMA-IR ~2x higher (3.52 vs 1.98); inflammation partly mediates PCOS-IR link via SEM. |
| Aboeldalyl S, James C, Seyam E, Ibrahim EM, Shawki HE, Amer S 2021 · Int J Mol Sci | meta-analysis | supports | moderate | CRP significantly elevated in PCOS vs controls; partly adiposity-driven. |
| Adhami K, Karimian M, Karimian Z 2026 · Scientific reports | observational | supports | low | Exosomal IL-6 and TGF-b1 mRNA significantly upregulated in PCOS vs healthy controls (no raw values/CI given). |
| Kagitci M, Bahceci I, Kivrak M, Deseet SA, Senturk S 2026 · Journal of clinical medicine | observational | supports | low | Serum IL-39 significantly higher in PCOS vs controls (p<0.001); independent predictor in multivariable analysis; AUC=0.74 alone, 0.78 with BMI/LH/age. |
| Azarbayjani K, Jahanian Sadatmahalleh S, Mottaghi A, Nasiri M 2024 · Sci Rep | observational | mixed | low | IL-6 higher (4.94 vs 3.48, p<0.001) but CRP NOT significantly different between groups. |
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