SLOT: Full Definition
What is PCOS?
Polycystic ovary syndrome — PCOS, sometimes called polycystic ovarian syndrome — is one of the most common hormonal conditions in women of reproductive age, affecting roughly 1 in 10. Despite the name, the defining problem is not the ovaries themselves but a wider hormonal and metabolic pattern: irregular ovulation, elevated androgens (testosterone-family hormones), and frequently Insulin Resistance.
Women with PCOS often experience irregular or missing periods, acne, unwanted hair growth on the face and body (hirsutism), thinning hair on the scalp, weight changes that resist effort, and difficulty conceiving. The ovaries may show many small follicles on ultrasound — the "polycystic" appearance — but those follicles are not true cysts and not the cause of symptoms.
What causes PCOS?
PCOS is multifactorial. The most common driver in modern women is insulin resistance: when cells respond poorly to insulin, the pancreas pumps out more, and high insulin signals the ovaries to make extra androgens. Other contributors include:
- Genetics — PCOS often runs in families
- Chronic inflammation
- Stress and HPA axis dysfunction
- Disrupted sleep
- Environmental endocrine disruptors
- Post-pill PCOS — a hormonal shift after stopping oral contraceptives
Not every woman with PCOS has insulin resistance, which is why a single treatment plan does not fit everyone.
How is PCOS diagnosed?
PCOS is diagnosed using the Rotterdam criteria — meeting two of three:
1. Irregular or absent ovulation
2. Clinical or lab evidence of high androgens (acne, hirsutism, elevated total or free testosterone, DHEA-S)
3. Polycystic-appearing ovaries on ultrasound
A thorough work-up at MTC also includes Fasting Insulin, glucose, Hba1c, a full lipid panel, thyroid labs, and prolactin to rule out look-alike conditions and identify the specific drivers in your case.
How is PCOS treated?
Root-cause treatment targets the upstream drivers — usually insulin and inflammation — rather than only suppressing symptoms with the pill. Approaches include:
- Nutrition focused on blood-sugar stability (protein, fiber, fewer refined carbs)
- Strength training to improve insulin sensitivity
- Targeted nutrients: Myo Inositol, magnesium, vitamin D, omega-3s
- Medications when appropriate: Metformin, spironolactone for androgen symptoms, Glp 1 Agonists for metabolic PCOS
- Sleep, stress, and gut work
At Modern Thyroid Clinic, PCOS is treated as a whole-body metabolic and hormonal condition. Many women see periods regulate, skin clear, and energy return when the right drivers are addressed.
Common questions
Can you have PCOS without cysts on your ovaries?
Yes — and the name is genuinely misleading. PCOS is a hormonal and metabolic syndrome, not a cyst disease. Diagnosis requires meeting two of three Rotterdam criteria, so a woman with irregular ovulation and high androgens (acne, hirsutism, elevated testosterone) qualifies for PCOS even if her ovaries look completely normal on ultrasound. Conversely, polycystic-appearing ovaries on imaging without other features are not PCOS. This is why thorough labs and clinical history matter more than ultrasound alone.
Will losing weight cure my PCOS?
Weight loss can dramatically improve PCOS symptoms in women who carry excess weight, particularly because it improves insulin sensitivity. Periods often regularize, androgens drop, and fertility improves. But PCOS occurs in lean women too — roughly 20 to 30 percent — and for them, weight loss is not the answer. The underlying issue is still insulin signaling, inflammation, or stress physiology. Treatment should target the actual drivers, not assume weight is the universal fix. A clinician can help identify your specific PCOS pattern.
Is the birth control pill the best treatment for PCOS?
The pill masks PCOS symptoms by suppressing ovulation and lowering free androgens, which can be helpful short-term — especially for severe acne or contraception. But it does not treat the underlying insulin resistance, inflammation, or hormonal imbalance, and symptoms typically return when the pill is stopped. A root-cause approach addresses the metabolic drivers so your body can make its own balanced hormones. The pill remains a reasonable tool in the right context, but it is rarely the only or best long-term plan.
Think you might be dealing with this?
Talk to a Modern Thyroid Clinic specialist about your symptoms, labs, and next steps.
Book a Discovery CallThis content is for educational purposes only and is not medical advice. Consult a licensed clinician for diagnosis and treatment. Content on this page does not create a doctor-patient relationship with Modern Thyroid Clinic.