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EndocrineICD-10: E28.2Affects 6–12% of reproductive-age women in the US (about 5 million)

Polycystic Ovary Syndrome

Also known as: PCOS, Polycystic Ovarian Syndrome, Stein-Leventhal Syndrome

Polycystic ovary syndrome (PCOS) is a common hormonal disorder affecting women of reproductive age, characterized by irregular menstrual periods, excess androgen (male hormone) levels, and polycystic ovaries on ultrasound. It is the leading cause of female infertility and is associated with insulin resistance, metabolic syndrome, type 2 diabetes, and cardiovascular risk. Early diagnosis and management can prevent long-term complications.

Symptoms

Irregular, infrequent, or absent menstrual periods
Excess hair growth on the face, chest, and back (hirsutism)
Acne and oily skin
Thinning hair or male-pattern baldness
Weight gain, especially around the abdomen
Darkened skin patches (acanthosis nigricans)
Difficulty getting pregnant (infertility)
Mood changes including anxiety and depression

Causes

  • Hormonal imbalance with elevated androgens
  • Insulin resistance and compensatory hyperinsulinemia
  • Genetic predisposition (multiple genes involved)
  • Low-grade chronic inflammation

Risk Factors

  • Family history of PCOS
  • Obesity or overweight
  • Insulin resistance or type 2 diabetes
  • Sedentary lifestyle
  • Family history of type 2 diabetes

Diagnosis

  • Rotterdam criteria (2 of 3: oligo/anovulation, hyperandrogenism, polycystic ovaries on ultrasound)
  • Blood tests for androgens (testosterone, DHEA-S), glucose, insulin, and lipids
  • Pelvic ultrasound showing multiple small follicles (≥12 per ovary or ovarian volume >10 mL)
  • Exclusion of other causes (thyroid disease, congenital adrenal hyperplasia, Cushing syndrome)

Treatment

  • Lifestyle modifications (weight loss of 5–10% significantly improves symptoms)
  • Combined oral contraceptive pills for cycle regulation and androgen reduction
  • Metformin for insulin resistance
  • Spironolactone for hirsutism and acne
  • Letrozole or clomiphene for ovulation induction (fertility treatment)
  • In vitro fertilization (IVF) for resistant infertility

Prevention

  • PCOS itself cannot be prevented, but complications can be reduced by:
  • Maintaining a healthy weight through diet and exercise
  • Monitoring and managing blood sugar and insulin levels
  • Regular screening for diabetes and cardiovascular risk factors

When to See a Doctor

  • Irregular or absent menstrual periods
  • Unwanted facial or body hair growth
  • Difficulty conceiving after 12 months of trying
  • Signs of insulin resistance or rapid weight gain

Frequently Asked Questions

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