Hormonal Health
PCOS: Causes, Symptoms, and Treatment Options
Haute MD Editorial Team
Polycystic ovary syndrome (PCOS) is the most common hormonal disorder in women of reproductive age, affecting approximately 8-13% of women worldwide. It is characterized by a combination of irregular or absent periods, elevated androgens (male hormones — testosterone, DHEA-S), and often (but not always) polycystic ovaries on ultrasound. PCOS is not a single condition — it is a syndrome with multiple phenotypes that vary in severity. Insulin resistance is present in 65-80% of women with PCOS and is a central driver of the hormonal dysregulation. There is no cure, but PCOS is highly manageable with appropriate treatment.
Diagnosis and the Rotterdam criteria
PCOS is diagnosed when at least 2 of 3 criteria are present (the Rotterdam criteria) — irregular or absent periods (fewer than 8 per year), evidence of elevated androgens (either clinical — excess hair growth, acne, hair loss — or biochemical — elevated total or free testosterone, DHEA-S), and polycystic ovaries on ultrasound (12 or more follicles per ovary or increased ovarian volume). Other conditions that cause similar symptoms (thyroid disease, congenital adrenal hyperplasia, hyperprolactinemia, Cushing's syndrome) must be ruled out. Blood tests — fasting glucose, insulin, lipid panel, testosterone (free and total), DHEA-S, thyroid, AMH (anti-Müllerian hormone), and sometimes prolactin and 17-hydroxyprogesterone.
Treatment by symptom
For irregular periods — combined oral contraceptive pills (estrogen + progestin) regulate the cycle and reduce androgen levels; progesterone-only (10-14 days per cycle) induces withdrawal bleeds in women who cannot use estrogen. For excess hair and acne — spironolactone (100-200mg daily) blocks androgen receptors and is highly effective for hormonal hair and skin concerns; oral contraceptives add benefit. For insulin resistance and metabolic concerns — metformin improves insulin sensitivity, reduces androgen levels, and supports modest weight loss; inositol (myo-inositol) has growing evidence as an alternative. For fertility — clomiphene citrate or letrozole for ovulation induction; metformin as adjunct.
Lifestyle — the most powerful intervention
For women with PCOS and insulin resistance, lifestyle modification produces metabolic improvements that no medication can fully replicate. Weight loss of 5-10% of body weight (in overweight women) significantly improves menstrual regularity, androgen levels, insulin sensitivity, and fertility — often restoring ovulation in women who had been anovulatory. Low-glycemic-index diet consistently improves insulin sensitivity in PCOS. Regular exercise (particularly resistance training) improves insulin sensitivity independently of weight loss. These lifestyle changes work additively with medication.
Frequently Asked Questions
Can PCOS be cured?
No. PCOS is a lifelong condition that requires ongoing management. However, symptoms can be very effectively controlled with appropriate treatment. Some women find that symptoms improve significantly with weight loss and lifestyle modification. Symptoms may also change across the lifespan — irregular periods may regularize somewhat after the 30s, but metabolic risk (diabetes, cardiovascular disease) requires ongoing attention.
Does PCOS affect fertility?
Yes, PCOS is one of the most common causes of female infertility due to irregular or absent ovulation. However, the majority of women with PCOS who want to conceive can do so with appropriate treatment — typically ovulation induction with clomiphene or letrozole. IVF is rarely required as a first-line approach. Weight loss (if applicable) can restore ovulation without medication in many women.
What diet helps PCOS?
No single diet is established as the PCOS diet, but low-glycemic-index eating (reducing rapidly absorbed carbohydrates that spike blood sugar and insulin) consistently improves insulin sensitivity, reduces androgen levels, and supports weight management in PCOS. Anti-inflammatory foods (omega-3 fatty acids, vegetables, fruits) support overall hormonal health. Caloric restriction for weight loss (where applicable) is the single most impactful dietary intervention for insulin-resistant PCOS.
Is metformin safe for PCOS?
Yes. Metformin is well-established and extensively used off-label for PCOS — it is FDA-approved for type 2 diabetes but widely prescribed for PCOS due to its insulin-sensitizing effects. The most common side effects are gastrointestinal (nausea, diarrhea) — usually dose-dependent and minimized by starting at low doses and titrating slowly, and by taking with food. Extended-release formulations have fewer GI side effects.
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