Polycystic ovary syndrome affects roughly 1 in 10 women and is diagnosed by any two of: irregular or absent ovulation, excess androgen signs (acne, excess hair, scalp thinning) or blood levels, and polycystic-appearing ovaries on ultrasound — after mimics are excluded. Its engine in most women is insulin resistance: high insulin pushes the ovaries to overmake androgens, which disrupt ovulation. Treatment targets the person's priorities — cycle regulation (hormonal contraception), fertility (ovulation induction with letrozole works well), androgen symptoms, and metabolism (lifestyle, metformin; inositol has fair trial support). Long-term, PCOS raises type 2 diabetes and endometrial risks — both manageable with monitoring.
What PCOS is
Polycystic ovary syndrome is a hormonal-metabolic condition affecting roughly 8–13% of women of reproductive age, and its name is a historical accident: the ovarian "cysts" are stalled follicles — eggs whose monthly development halts partway — crowding the ovary's rim. The real machinery is a signaling loop:
Insulin resistance (present in most women with PCOS, lean ones included) keeps insulin levels high → high insulin prods the ovaries' theca cells to overproduce androgens (testosterone and relatives) and tells the liver to make less of the protein that binds them → free androgens disrupt follicle maturation (cycles stall → irregular ovulation → the crowded-follicle scan) and act on skin and hair → meanwhile disrupted ovulation feeds back into the hormonal disorder. Weight gain amplifies the loop; the loop's insulin side promotes weight gain — the bidirectional trap familiar from insulin resistance generally.
Genetics load the mechanism (FAQ); environment sets its volume.
How it shows up
- Cycle irregularity — cycles beyond 35 days, skipped months, or unpredictable timing, from ovulation that happens erratically or not at all; often present since adolescence
- Androgen effects — persistent acne, hirsutism (coarse dark hair on face, chest, abdomen — affecting the majority to some degree), scalp-pattern thinning
- Metabolic signature — abdominal weight gain that resists effort, energy dips, skin tags, darkened velvety neck/armpit creases (acanthosis nigricans — insulin's skin signature)
- Fertility friction — per the FAQ: delay more than denial
- Mood effects — anxiety and depression run higher, from biology and burden both
Severity spreads widely; plenty of PCOS is mild, discovered only when cycles or conception raise the question.
Diagnosis
By the Rotterdam criteria: any two of (1) irregular/absent ovulation, (2) clinical or biochemical androgen excess, (3) polycystic ovarian morphology on ultrasound — after excluding mimics: thyroid disease, high prolactin, congenital adrenal hyperplasia, and (rarely) androgen-secreting tumors or Cushing's. Bloods typically cover testosterone (total and free), SHBG, LH/FSH, prolactin, TSH, 17-OHP — plus the metabolic set this site keeps recommending: A1C or glucose, lipids. Teenagers get stricter criteria (irregularity and acne are adolescent normals; scans mislead) — usually both cycle disturbance and androgen excess, scan not required.
Treatment, by goal
PCOS management is modular — matched to what the woman wants treated:
The metabolic base (everyone): the insulin-resistance playbook — resistance training and daily movement, a protein-and-fiber-forward eating pattern, sleep and stress repair; 5–10% weight loss where weight has risen restores ovulation in a substantial fraction and improves everything downstream. Metformin helps cycles and metabolism, especially with higher weight or prediabetes. Inositol (myo-inositol, often with d-chiro) — the aisle's respectable citizen: multiple trials show improved ovulation and insulin measures, with international PCOS guidelines acknowledging it as an option; typical studied dose 2 g myo-inositol twice daily. It earns the same honest framing as everything here — adjunct with fair evidence, not cure.
Cycles and androgen symptoms: combined hormonal contraception regulates bleeding, protects the uterine lining and lowers androgens (helping acne and hirsutism over months); anti-androgens (spironolactone) add hair-and-skin benefit with contraception aboard; cosmetic approaches (laser/electrolysis) are legitimate medicine here, not vanity.
Fertility: letrozole first-line for ovulation induction (outperforming clomiphene in trials), weight optimization, metformin as adjunct, then gonadotropins/IVF for the minority — a well-trodden, mostly successful path.
Long-term surveillance — the quiet essentials: markedly raised lifetime type 2 diabetes risk (periodic A1C/OGTT, pregnancies screened early for gestational diabetes), lipids and blood pressure checks, and endometrial protection — months without periods mean unopposed estrogen thickening the lining, so persistent long gaps warrant induced bleeds or protective hormonal methods, and any prolonged absence then heavy flooding merits review.
When to see a doctor
For cycles persistently outside 21–35 days beyond adolescence, androgen symptoms that distress, conception delays past 6–12 months of trying, the acanthosis-type skin signs, or PCOS-plus-pregnancy planning (preconception glucose matters). And for the already-diagnosed: the annual metabolic check is the appointment that pays decades later — PCOS managed is mostly PCOS outlived comfortably.
Frequently asked questions
I have ovarian "cysts" on a scan — do I have PCOS?
Not by that alone. The "cysts" of PCOS are actually crowds of small stalled follicles (a normal structure, arrested mid-development), and up to a quarter of women have that appearance with normal cycles and hormones — no syndrome. Conversely, PCOS can be diagnosed with normal-looking ovaries if cycles and androgens qualify. The scan is one criterion of three, and the least decisive.
Can I get pregnant with PCOS?
Very likely yes — PCOS is a cause of slower conception, not sterility. Many women conceive unaided (ovulation is irregular, not absent — which is also why contraception still matters when avoiding pregnancy). When help is needed, letrozole induces ovulation with good success, weight change restores ovulation in a meaningful share, and IVF stands behind for the minority. Most women with PCOS who want children have them.
Does PCOS go away after menopause — or with weight loss?
The reproductive symptoms retire with the ovaries; the metabolic tendency doesn't — diabetes vigilance stays lifelong. Weight loss (5–10%) can restore ovulation, soften androgen symptoms and improve metabolism, and is genuinely first-line where weight has risen; it treats the syndrome's expression, not its underlying wiring, and PCOS occurs in lean women too, where insulin resistance can still be present.
Is PCOS caused by my diet or something I did?
No. It's a heritable predisposition (it clusters in families, affects identical twins concordantly, and likely involves programming before birth) whose expression is amplified by insulin resistance and weight gain. Diet and activity are levers on the expression — powerful ones — not causes of the wiring, and no one flexes their way into or out of the genetics.
References
- Office on Women's Health. Polycystic ovary syndrome (2023). https://www.womenshealth.gov/a-z-topics/polycystic-ovary-syndrome
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Type 2 Diabetes (2023). https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/type-2-diabetes
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