Thyroid autoimmunity linked to lower ovarian reserve markers in womenThyroid antibodies may link to lower ovarian reserve in women
Frontiers in MedicinePublished October 20, 2026DOI ↗Editorial oversight: Dr. Sofia Müller, MD · Lifespan & Whole-Person Care
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Key Takeaway
Interpret thyroid autoimmunity as associated with, not causative of, lower ovarian reserve markers.
This meta-analysis pooled data from observational studies to evaluate the relationship between thyroid autoimmunity (TAI) and diminished ovarian reserve (DOR) in women. The analysis included 4,286 participants and focused on serum anti-Müllerian hormone (AMH) and thyroglobulin antibody (TgAb) levels or positivity.
Among TAI-positive women (n=870), serum AMH levels were significantly lower than in controls, with a small effect size (SMD -0.20; 95% CI -0.34 to -0.06; P=0.005). In the reverse analysis, women with DOR (n=1,496) had significantly higher TgAb levels compared with controls (SMD 0.93; 95% CI 0.36 to 1.50; P=0.001). Additionally, women with DOR (n=2,568) had higher odds of TgAb positivity (OR 1.65; 95% CI 1.29 to 2.11).
The authors note high heterogeneity (I2=94%) for the TgAb level estimate in women with DOR, which limits confidence in that pooled effect. The meta-analysis is based on observational studies, so the findings indicate association rather than causation. The authors explicitly state that the reverse analysis does not imply temporal or causal reversal. Safety data, funding, and practice relevance were not reported.
These results suggest a modest cross-sectional link between thyroid autoimmunity and ovarian reserve markers, but the observational design and heterogeneity preclude clinical recommendations. Clinicians should interpret these associations cautiously and not infer that treating thyroid autoimmunity would alter ovarian reserve.
How this fits prior evidence
This meta-analysis extends prior coverage of diminished ovarian reserve by focusing on thyroid autoimmunity as a correlated factor. Previous notes highlighted preclinical macrophage immunometabolism modulation, Chinese herbal medicines, and platelet-rich plasma/G-CSF as potential ovarian rejuvenation strategies, all with limited or heterogeneous evidence. Separately, hyperthyroidism was noted to have a small association with anxiety (OR 1.38), while evidence for hypothyroidism was inconclusive. The current findings add observational support for an association between thyroid autoimmunity and lower AMH, but like prior coverage, they do not establish causality or clinical utility.
For many women, understanding the link between thyroid health and fertility is a vital piece of the puzzle. New research highlights a specific connection between thyroid autoimmunity and a woman's ovarian reserve, which is the remaining supply of eggs. The study looked at thousands of women to see how these factors interact.
Researchers found that women with thyroid autoimmunity had significantly lower levels of anti-Müllerian hormone. This hormone is a common marker used to estimate how many eggs a woman has left. Additionally, women with a diminished ovarian reserve showed much higher levels of thyroglobulin antibodies. These are proteins that the body produces in response to thyroid issues.
While these findings show a clear link between thyroid markers and ovarian health, it is important to remember that this study shows an association rather than a direct cause. Because the data comes from various sources, there is some variation in the results. If you have concerns about your thyroid or fertility, talk to your doctor to see what these markers mean for your specific health journey.
What this means for you:
Women with thyroid autoimmunity may have lower hormone levels linked to a smaller ovarian reserve.
Common questions
What is ovarian reserve and why does it matter?
Ovarian reserve refers to the number of eggs a woman has left. This is important because it helps doctors understand a woman's fertility potential. The study found that women with thyroid autoimmunity had significantly lower levels of anti-Müllerian hormone, which is a key marker used to measure this reserve.
What are thyroglobulin antibodies?
Thyroglobulin antibodies (TgAb) are markers that can indicate thyroid issues. The study found that women with a diminished ovarian reserve had significantly higher levels of these antibodies compared to healthy controls. Specifically, these women had significantly higher odds of testing positive for these antibodies.
Does this mean thyroid issues cause low egg counts?
The study shows a link between thyroid antibodies and lower ovarian reserve, but it does not prove that one causes the other. Because this was a meta-analysis of observational studies, it shows an association rather than a direct cause. You should speak with a healthcare provider to understand how these findings apply to your specific situation.
BackgroundEvidence suggests that thyroid autoimmunity (TAI) may be associated with ovarian dysfunction; however, most studies have focused primarily on thyroid peroxidase antibodies (TPOAb), while evidence regarding thyroglobulin antibodies (TgAb) remains limited and inconsistent. This study aimed to evaluate the association between TAI/TgAb and ovarian reserve.MethodsA systematic literature search was conducted in PubMed, Embase, Web of Science, CNKI databases for Chinese- and English-language articles published from January 2014 to January 2025. A bidirectional validation design was employed: (1) forward analysis, quantifying between-group differences in serum anti-Müllerian hormone (AMH) levels between TAI-positive women and healthy controls using standardized mean differences (SMD); and (2) reverse analysis, quantifying differences in TgAb levels (SMD for continuous variables) and TgAb positivity rates (odds ratios OR for dichotomous variables) between women with diminished ovarian reserve (DOR) and healthy controls. This study was prospectively registered with PROSPERO (CRD420251207428) and conducted in accordance with the PRISMA 2020 guidelines. The reverse analysis denotes a reverse-direction cross-sectional comparison in which the grouping and outcome variables are exchanged; it does not imply temporal or causal reversal.ResultsThirteen studies (total n = 4,286) were included. Forward analysis (4 studies, n = 870) demonstrated significantly lower serum AMH levels in TAI-positive women compared with controls (SMD=−0.20, 95% CI [−0.34, −0.06], P = 0.005, I2 = 0%). Reverse analysis of continuous variables (5 studies, n = 1,496) revealed significantly elevated TgAb levels in women with DOR compared with controls (SMD=0.93, 95% CI [0.36, 1.50], P = 0.001, I2 = 94%); however, this estimate should be interpreted with caution given the substantial heterogeneity. Reverse analysis of dichotomous variables (7 studies, n = 2,568) confirmed that women with DOR had significantly higher odds of TgAb positivity compared with controls (OR=1.65, 95% CI [1.29, 2.11], P
