PCOS vs PCOD: What's the Difference?

If you've heard both “PCOS” and “PCOD” used for the same set of symptoms and wondered which one you actually have, here's the short answer: they're the same condition. This guide explains what the medical criteria for PCOS actually require, why “PCOD” isn't a recognised diagnosis, and what the real symptoms, risks, and treatment options look like.

This article is for general educational purposes only and does not replace personalised medical advice, diagnosis, or treatment. Talk to your provider about your specific symptoms and test results.

In short: PCOS (Polycystic Ovary Syndrome) is the official medical diagnosis, defined by having at least 2 of 3 features - excess androgen signs, irregular ovulation, or polycystic ovaries on ultrasound. “PCOD” is a colloquial term, especially common in South Asia, used interchangeably with PCOS. It isn't a separate, formally recognised diagnosis in international guidelines.

• PCOS affects roughly 5-15% of reproductive-age women, depending on which diagnostic criteria are used.
• “PCOD” and “PCOS” describe the same underlying condition - major guidelines don't distinguish them as separate diseases.
• Insulin resistance is present in up to 70% of PCOS cases and drives much of the hormonal imbalance.
• Diagnosis requires ruling out thyroid disease, high prolactin, and other hormone conditions that mimic PCOS.
• Treatment is tailored to your goals - cycle regulation and anti-androgens if you're not trying to conceive, or ovulation induction if you are.

The confusion is understandable: two acronyms, one syndrome. PCOS is the term used in international guidelines - Rotterdam, NIH, and the Androgen Excess and PCOS Society all define it with specific diagnostic criteria. PCOD, by contrast, has no formal diagnostic criteria of its own; it's simply a regional label for the same combination of irregular ovulation and ovarian follicle changes.

Some non-medical sources describe PCOD as a “milder, lifestyle” version and PCOS as more severe - but this distinction isn't evidence-based or recognised by major medical bodies. Even reference sources like MedlinePlus list “polycystic ovary disease (PCOD)” simply as an alternate name for PCOS.

Diagnosis requires 2 of these 3 features, after ruling out other causes:

• Hyperandrogenism - clinical signs (excess facial or body hair, acne, scalp hair thinning) or a blood test showing elevated testosterone.
• Ovulatory dysfunction - irregular or absent periods (cycles shorter than 21 days, longer than 35 days, or fewer than 8 cycles a year).
• Polycystic ovaries on ultrasound - 12 or more small follicles per ovary, or increased ovarian volume.

Before confirming PCOS, your provider will typically check thyroid function (TSH), prolactin, and a morning 17-hydroxyprogesterone level to rule out thyroid disease, high prolactin, and a mild adrenal condition that can mimic PCOS symptoms. A pregnancy test is standard for anyone with missed periods.

• Irregular or absent periods - the most common sign, seen in more than 80% of cases.
• Excess hair growth or acne - hirsutism (coarse hair on the face, chest, or back) affects roughly 70% of patients; persistent adult acne is also common.
• Weight and metabolic signs - 40-80% of people with PCOS are overweight or obese, though lean PCOS (normal BMI) accounts for at least 20-30% of cases. Darkened skin at the neck or underarms (acanthosis nigricans) can signal insulin resistance.
• Ovarian appearance on ultrasound - a “string of pearls” pattern of small follicles, though this alone isn't enough for diagnosis since up to 25% of people without PCOS have similar-looking ovaries.
• Difficulty conceiving - due to irregular or absent ovulation, PCOS is the most common cause of ovulation-related infertility.

At the core of PCOS is a cycle involving two things: excess androgens from the ovaries, and insulin resistance, present in up to 70% of cases. High insulin levels push the ovaries to produce more androgens and lower a protein that normally keeps testosterone bound and inactive - so more testosterone ends up free and active in the bloodstream.

These excess androgens disrupt normal follicle development, which is why ovulation becomes irregular or stops altogether. It becomes a self-reinforcing loop: insulin resistance drives androgen excess, and androgen excess makes the metabolic picture worse.

Population data show PCOS affecting roughly 5-15% of reproductive-age women, varying by which diagnostic criteria are applied - narrower NIH criteria yield lower estimates (around 6-10%), while the broader Rotterdam criteria push figures toward 10-15% or higher.

Among women with PCOS, studies find 30-35% have impaired glucose tolerance and 3-10% have type 2 diabetes, notably higher than age-matched peers without the condition. With appropriate treatment, roughly 70-80% of people with PCOS-related infertility go on to conceive.

PCOS carries risks beyond irregular periods. Insulin resistance raises long-term risk of type 2 diabetes and dyslipidaemia, which is why regular glucose and lipid screening is recommended. Unopposed estrogen exposure from chronic anovulation raises the risk of endometrial hyperplasia and, over time, endometrial cancer - a key reason long stretches without a period shouldn't go unaddressed.

During pregnancy, PCOS is linked to a higher chance of gestational diabetes and pregnancy-related hypertension, which is part of why some PCOS pregnancies benefit from closer specialist monitoring. Depression, anxiety, and sleep apnoea also occur more often in PCOS and are worth mentioning to your provider even if they feel unrelated to your periods.

If you're not trying to conceive:

If you're trying to conceive:

For everyone: a modest 5-10% weight loss can meaningfully improve insulin sensitivity and, in some cases, restore ovulation. A low-glycaemic or Mediterranean-style eating pattern and regular activity are the standard starting point - see our guides to lifestyle management for PCOS and fertility treatments for PCOS.

Whether your provider says “PCOS” or “PCOD”, you're dealing with the same underlying hormonal condition - one defined by specific diagnostic criteria, not by which acronym gets used locally.

Understanding the real criteria, symptoms, and treatment options rather than the terminology is what actually helps you manage it, whether your priority is regulating your cycle, addressing acne and hair growth, or planning a pregnancy.

Next step: if you suspect PCOS or PCOD, ask your provider for the standard workup - TSH, prolactin, testosterone, and a pelvic ultrasound - so you get a clear diagnosis and a treatment plan matched to your actual goals.

Seek prompt medical attention for very heavy or prolonged bleeding, sudden severe pelvic pain, or rapid-onset hair growth and voice changes - the last two can occasionally signal a rarer hormone-producing tumour rather than typical PCOS and warrant a closer look.

• MedlinePlus - Polycystic Ovary Syndrome (PCOS).
• Cleveland Clinic - Polycystic Ovary Syndrome (PCOS).
• Teede et al. - International Evidence-Based Guideline for the Assessment and Management of PCOS (2018, 2023 update).
• Legro et al. - Endocrine Society Clinical Practice Guideline on PCOS diagnosis and treatment.

This overview reflects current international consensus (Rotterdam/NIH/AE-PCOS criteria and Endocrine Society guidance) on PCOS diagnosis and management. Individual treatment plans should be built with your provider based on your specific labs and goals.