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Polycystic ovary syndrome (PCOS) is often recognized by its reproductive manifestations, but its biology extends far beyond ovarian dysfunction.
PCOS reflects a complex hormonal–metabolic network in which insulin resistance, androgen excess, and thyroid dysfunction can reinforce one another and shape disease severity.
Polycystic ovary syndrome (PCOS) is often recognized by its reproductive manifestations, but its biology extends far beyond ovarian dysfunction. Metabolic disturbances, particularly insulin resistance (IR) and compensatory hyperinsulinemia, frequently coexist with androgen excess, while thyroid abnormalities may further influence metabolic and reproductive health. Viewing these abnormalities separately may overlook important biological connections.
This narrative review explored PCOS through a triangular hormonal–metabolic model, bringing IR, androgen excess, and thyroid dysregulation into a single framework to better comprehend the heterogeneity of PCOS and its potential cardiometabolic consequences.
A targeted literature search was executed across Scopus, PubMed, and Google Scholar. The literature search used combinations of keywords covering PCOS, IR, hyperinsulinemia, hyperandrogenism, thyroid abnormalities, subclinical hypothyroidism, autoimmune thyroiditis, and cardiometabolic risk. Relevant evidence was prioritized from systematic reviews, meta-analyses, mechanistic investigations, observational studies, international guidelines, and clinically pertinent interventional research. Evidence was synthesized thematically in accordance with the epidemiology, pathophysiology, clinical manifestations, and phenotype-directed care.
IR was identified as a major metabolic component of PCOS. Compensatory hyperinsulinemia may stimulate ovarian androgen production while decreasing sex hormone-binding globulin levels, thereby raising androgen bioavailability and contributing to impaired ovulation. Conversely, androgen excess may worsen IR through effects on visceral adiposity and adipose tissue dysfunction, suggesting a potentially bidirectional relationship.
Thyroid abnormalities, particularly thyroid autoimmunity and subclinical hypothyroidism, may further influence the PCOS phenotype in selected patients. Thyroid abnormalities have been connected with alterations in insulin sensitivity, lipid metabolism, inflammatory pathways, and follicular function, potentially intensifying both metabolic and reproductive disturbances.
Overall, the evidence supports an interconnected model in which IR, hyperandrogenism, and thyroid dysregulation may interact rather than function as isolated abnormalities. This relationship may help explain the heterogeneity of PCOS presentations and differences in cardiometabolic and reproductive risk among affected individuals.
PCOS is best viewed as a complex endocrine–metabolic disorder in which IR, androgen excess, and thyroid dysfunction may converge to influence reproductive and cardiometabolic health. The proposed triangular model offers a broader perspective on how these interconnected pathways may amplify metabolic dysfunction and reproductive abnormalities across different PCOS phenotypes. Recognizing this interplay could support more individualized evaluation and phenotype-directed care.
Journal of Health, Wellness and Community Research
Insulin Resistance, Thyroid Dysregulation, and Androgen Excess in Polycystic Ovary Syndrome: A Narrative Review of a Triangular Hormonal–Metabolic Model
Javeria Shabbir et al.
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