Introduction: More Than a Reproductive Disorder

Polycystic Ovary Syndrome (PCOS) is the most common endocrine disorder in women of reproductive age, affecting 8–13% of women worldwide. Despite its name, PCOS is not primarily an ovarian condition—it’s a complex metabolic and hormonal disorder with reproductive, metabolic, cardiovascular, and psychological implications.

Up to 70% of women with PCOS remain undiagnosed. Many are told their irregular periods are “just how their body works,” their weight gain is a personal failing, and their acne or hair growth is a cosmetic issue. The underlying metabolic dysfunction—insulin resistance—often goes unrecognized and untreated for years.

PCOS affects fertility, but it’s much more than a fertility problem. Understanding and managing PCOS is important for every aspect of health across the lifespan.

Internal link: PCOS often affects libido and sexual function—read Sexual Desire: The Science of Libido.

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What Is PCOS?

PCOS is characterized by a combination of:
1. Androgen excess: Elevated male hormones (testosterone, androstenedione, DHEA-S)
2. Ovulatory dysfunction: Irregular or absent ovulation → irregular or absent periods
3. Polycystic ovarian morphology: Multiple small follicles visible on ultrasound (not actually “cysts” but immature follicles that failed to develop)

The Central Role of Insulin Resistance

Insulin resistance is the core metabolic abnormality in PCOS, present in 65–80% of women with the condition, independent of body weight. Here’s how it drives PCOS:

1. Insulin resistance → compensatory hyperinsulinemia (high insulin levels)
2. High insulin stimulates the ovaries to produce excess androgens (testosterone)
3. High insulin reduces SHBG (sex hormone binding globulin) production in the liver → more free, active testosterone
4. Excess androgens disrupt normal follicular development → anovulation
5. Anovulation → absent progesterone → unopposed estrogen → endometrial overgrowth

This is why treating insulin resistance is the cornerstone of PCOS management—not just for metabolic health, but for reproductive and hormonal health as well.

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Symptoms and Signs

Reproductive

• Irregular, infrequent, or absent periods (<8 periods="periods" per="per" year="year">
• Heavy menstrual bleeding (when periods do occur, due to endometrial buildup)
• Infertility (PCOS is the leading cause of anovulatory infertility)
• Recurrent miscarriage (3x higher risk)

Androgen Excess

• Hirsutism (male-pattern hair growth): Face, chin, chest, abdomen, back
• Acne (particularly along jawline and lower face, often persistent into adulthood)
• Male-pattern hair loss (androgenic alopecia)
• Oily skin

Metabolic

• Weight gain and difficulty losing weight (particularly abdominal/visceral pattern)
• Insulin resistance and prediabetes (PCOS women have 4x higher type 2 diabetes risk)
• Dyslipidemia (high triglycerides, low HDL)
• Acanthosis nigricans (dark, velvety skin patches on neck, armpits, groin—a sign of insulin resistance)
• Skin tags (acrochordons)

Psychological

• Depression and anxiety (significantly higher rates than women without PCOS)
• Eating disorders (higher rates, possibly related to body image distress and weight cycling)
• Reduced quality of life

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Diagnosis

Rotterdam Criteria (Most Widely Used)

PCOS is diagnosed when 2 of 3 criteria are met (after excluding other causes):

1. Oligo-ovulation or anovulation (irregular or absent periods)
2. Clinical or biochemical hyperandrogenism (hirsutism, acne, hair loss, or elevated testosterone on blood work)
3. Polycystic ovaries on ultrasound (≥20 follicles per ovary or ovarian volume >10 mL)

Excluding Other Conditions

• Thyroid dysfunction
• Hyperprolactinemia
• Non-classic congenital adrenal hyperplasia
• Androgen-secreting tumors
• Cushing’s syndrome
• Hypothalamic amenorrhea (distinguished by low LH, normal androgens)

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Treatment: A Multi-System Approach

Lifestyle: The Foundation

Weight management:
Even 5–10% weight loss significantly improves insulin sensitivity, restores ovulation, reduces androgens, and improves fertility in overweight women with PCOS. However, weight loss is more difficult with PCOS due to insulin resistance—this is biological, not a failure of willpower.
Dietary strategies:

• Lower glycemic index/load: Reduces postprandial insulin spikes. Emphasize whole grains, legumes, non-starchy vegetables; limit refined carbohydrates and added sugars.
• Adequate protein: 25–30% of calories improves satiety and stabilizes blood glucose.
• Healthy fats: Monounsaturated and omega-3 fats improve lipid profiles and reduce inflammation.
• Inositol: Myo-inositol (2–4g/day) improves insulin sensitivity and ovulation in PCOS. D-chiro-inositol at lower doses may augment effects. 40:1 myo:DCI ratio mimics physiological ratios.
• Mediterranean diet: Consistent benefits for metabolic parameters.

Exercise:
Both aerobic and resistance training improve insulin sensitivity. Even without weight loss, exercise improves metabolic parameters. Aim for 150+ minutes moderate activity + 2 strength sessions weekly.
Sleep:
Sleep deprivation worsens insulin resistance. Women with PCOS have higher rates of obstructive sleep apnea (independent of BMI). Screen and treat.

Medication

Hormonal Contraceptives:
First-line for menstrual regulation and androgen suppression:

• Combined OCPs suppress ovarian androgen production and increase SHBG
• Anti-androgenic progestins (drospirenone, cyproterone) provide additional benefit for hirsutism and acne
• Cyclic or continuous use regulates bleeding and protects the endometrium

Anti-Androgens:

• Spironolactone: Blocks androgen receptors. Effective for hirsutism and acne. Requires contraception (teratogenic—feminizes male fetuses). Dose: 50–200mg/day.
• Finasteride: 5-alpha reductase inhibitor. Less studied in PCOS but effective for hirsutism. Also requires contraception.

Insulin Sensitizers:

• Metformin: Improves insulin sensitivity, modestly reduces androgens, and may restore ovulation in some women. Less effective than lifestyle intervention alone. GI side effects common (start low, go slow). Dose: 1,500–2,000mg/day.
• GLP-1 agonists (liraglutide, semaglutide): Significant weight loss, improved insulin sensitivity, and ovulation restoration. Increasingly used in PCOS, particularly with obesity. Expensive.

Ovulation Induction (for fertility):

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