How Do You Know If You Have PCOS (Now Called PMOS)?
If your periods have never been predictable, or you've been fighting acne and unwanted hair growth well past your teens, you may have wondered whether something is going on beneath the surface. PCOS is one of the most common hormone conditions in women. It is also one of the most commonly missed - the World Health Organization estimates that as many as 70% of women who have it have never been diagnosed.
So how to know if you have PCOS is a fair question, and the honest answer surprises most people: there is no single blood test that says yes or no. Diagnosis means matching a pattern and ruling other things out. Here's what that actually looks like - including what its new name means.
How Common Is PCOS, Really?
You'll most often see the figure "about 1 in 10 women." That number is probably low, because it largely counts women who have already been diagnosed.
When researchers go looking - screening women in the general community rather than women who came in with a complaint - they find considerably more. A Danish study of 863 women aged 20 to 40 found PCOS in 16.6%, about 1 in 6. A meta-analysis pooling 30 studies from Iran found 19.5%, close to 1 in 5. In some populations the figure reaches 1 in 4.
In one Australian community study, roughly 70% of the women identified as having PCOS had no idea they had it before the researchers screened them.
That gap matters. It means a lot of women spend years being told their irregular periods are "just how you are," or treating adult acne as a skin problem, without anyone connecting the dots.
Wait - PCOS Has a New Name?
Yes. As of May 2026, the condition has been formally renamed PMOS - polyendocrine metabolic ovarian syndrome.
The change was published in The Lancet and announced at the European Congress of Endocrinology. It came out of a decade-long international consensus process led by Professor Helena Teede at Monash University, involving roughly 22,000 people worldwide - doctors, researchers, patient advocates, and women living with the condition - across surveys in 2017, 2023 and 2025. The final vote was 87 in favor out of 90.
Why change it? Because the old name pointed at the wrong thing. "Polycystic ovary" suggests the problem is cysts on your ovaries. But as you'll see below, you can have this condition with entirely normal-looking ovaries, and the cysts everyone pictures aren't really cysts at all. Meanwhile the name said nothing about the parts that affect your health most over a lifetime - insulin, metabolism, cardiovascular risk. One specialist described the shift as moving from a microscopic view to a telescopic one.
What this means for you, practically: not much, right now. If you've been diagnosed with PCOS, you have the same condition you had before. The way it's diagnosed hasn't changed. The way it's treated hasn't changed. Your chart, your insurance paperwork and most doctors' offices will keep saying PCOS for years - the consortium expects the new name to take about three years to spread.
We're mentioning it here because you'll start seeing PMOS appear, and it's better to know why than to wonder whether you've been diagnosed with something new. Throughout the rest of this article we'll say PCOS, since that's still what nearly everyone uses.
How Do You Know If You Have PCOS? The Three-Part Rule
Most clinicians in the United States use what are called the Rotterdam criteria. You need two out of these three:
1. Irregular or absent ovulation. Usually this shows up as irregular periods - cycles longer than 35 days, fewer than eight periods a year, or long stretches with no period at all.
2. Signs of excess androgens. Androgens are hormones like testosterone that everyone makes, but higher levels can cause acne that persists into adulthood, coarse hair growth on the face, chest or abdomen (called hirsutism), or thinning hair on the scalp. This can be identified either by examination or by a blood test.
3. Polycystic-appearing ovaries on ultrasound. More on this next, because it's the most misunderstood part.
Two of three. Which means - and this matters - you can absolutely have PCOS without ever having a cyst seen on an ultrasound. The old name has caused a lot of women to be told they don't have it when they do. It's a large part of why the name was changed.
The other half of diagnosis is ruling out conditions that look similar. Thyroid disease, elevated prolactin, and a condition called non-classic congenital adrenal hyperplasia can each mimic parts of the picture, which is why a proper workup includes more than just androgen levels.
Does PCOS Cause Cysts? What "Polycystic" Actually Means
This is one of the most common questions we hear, and the answer isn't what the name suggests.
The "cysts" in polycystic ovary syndrome aren't really cysts in the way most people picture them. They're small immature follicles - fluid-filled sacs, each containing an egg that started to develop and then stalled. On ultrasound they appear as many small dark circles arranged around the edge of the ovary, sometimes described as a "string of pearls." They're typically 2 to 9 millimeters across.
That's a completely different thing from the ovarian cysts people usually worry about - a functional cyst, a dermoid cyst, or an endometrioma. Those are single, larger structures, and they can occur in anyone, whether or not they have PCOS. Having a dermoid cyst does not mean you have PCOS, and having PCOS doesn't particularly predispose you to one.
If you'd like the fuller picture on ovarian cysts generally - the different types, which ones matter, and when one needs attention - we've written about that separately in What causes ovarian cysts?
One more nuance: as ultrasound technology has improved, a lot of perfectly healthy young women have ovaries that meet the "polycystic appearance" threshold. That's why ovarian appearance alone is never enough for a diagnosis, and why some guidelines now advise against using ultrasound at all in the first eight years after a first period.
What Are the Symptoms of PCOS?
Symptoms vary a great deal from person to person, and they change across your life. Some of the most common:
Menstrual changes - irregular cycles, very heavy periods when they do come, or months without one.
Skin and hair changes - persistent acne, oily skin, coarse dark hair on the face, chest, abdomen or back, or hair thinning at the crown.
Difficulty getting pregnant - PCOS is a leading cause of ovulatory infertility, because ovulation is irregular or absent.
Weight changes and difficulty losing weight - though it's worth saying clearly that plenty of women with PCOS are at a completely normal weight. Being thin does not rule it out, and being told it does is one of the ways women get missed.
Signs of insulin resistance - darkened, velvety patches of skin on the neck, underarms or groin (acanthosis nigricans), or skin tags.
Mood changes - anxiety and depression are meaningfully more common in women with PCOS than in women without it.
Not everyone has all of these, and any one of them alone often means nothing. It's the pattern that matters.
What Causes PCOS?
There's no single cause, and anyone who tells you otherwise is oversimplifying. Several things interact.
Insulin resistance plays a central role for many women. When your cells respond poorly to insulin, your body compensates by making more of it, and higher insulin levels prompt the ovaries to produce more androgens. This happens in lean and heavier women alike.
Higher androgen production interferes with the normal maturing and release of eggs, which disrupts ovulation and, in turn, your cycle.
Genetics matter. It clusters in families, so a mother or sister with PCOS raises your likelihood.
What does not cause PCOS: anything you did. It isn't caused by diet, by weight, by birth control, or by stress. Those can affect how symptoms behave, but they didn't create the condition.
When Should You See a Doctor About PCOS?
It's worth being evaluated if you notice any of these:
Fewer than eight periods a year, or cycles regularly longer than 35 days
No period for three months or more, when you aren't pregnant
Acne or unwanted hair growth that's new, worsening, or not responding to usual treatments
Trying to conceive for 12 months without success - or 6 months if you're over 35
A close relative with PCOS, plus any symptoms of your own
There's a reason not to wait this out, and it's the reason behind the new name. PCOS carries long-term risks that are far easier to manage when identified early: type 2 diabetes, high blood pressure and cholesterol changes, obstructive sleep apnea, and - because infrequent periods mean the uterine lining isn't shed regularly - an increased risk of endometrial hyperplasia and endometrial cancer. That last one is why we take irregular cycles seriously even in women who aren't trying to conceive.
A first evaluation isn't complicated. It's a conversation about your history and cycles, an examination, bloodwork to check hormone levels and screen for the conditions that mimic PCOS, and sometimes a pelvic ultrasound. From there you have a real answer, and options.
None of this is meant to diagnose you from a screen. If any of it sounds familiar, please talk with your doctor or other healthcare provider - the pattern is what matters, and that takes a conversation.
Frequently Asked Questions
Why was PCOS renamed PMOS?
In May 2026 an international consensus published in The Lancet renamed the condition polyendocrine metabolic ovarian syndrome. The old name focused on ovarian cysts, which aren't always present and aren't the defining feature, while saying nothing about the hormonal and metabolic effects that matter most long-term. Diagnosis and treatment are unchanged.
Can you have PCOS without cysts?
Yes, and it's common. Diagnosis requires two of three criteria, so a woman with irregular periods and signs of excess androgens has PCOS regardless of what her ovaries look like on ultrasound.
How many women have PCOS?
Commonly cited figures say about 1 in 10, but that likely undercounts. Community screening studies have found rates of 16% to nearly 20%, and up to 1 in 4 in some populations. The World Health Organization estimates up to 70% of women with the condition have never been diagnosed.
Do you have to be overweight to have PCOS?
No. A significant proportion of women with PCOS are at a normal weight - sometimes called lean PCOS - and can have the same hormonal and metabolic features. Being thin should never be a reason a diagnosis is dismissed.
Can you get pregnant with PCOS?
Yes. PCOS is a common cause of difficulty conceiving because ovulation is irregular, but most women with PCOS who want to become pregnant are able to, often with changes in nutrition, weight loss (when indicated) and other treatments that help restore ovulation.
What tests are used to diagnose PCOS?
There's no single PCOS test. Evaluation typically includes bloodwork for androgen levels, thyroid function, prolactin, and glucose or insulin measures, plus sometimes a pelvic ultrasound - with results interpreted together against the diagnostic criteria.
Getting Answers in Sherman
We provide gynecologic care for women across Sherman, Grayson County, North Texas and southeastern Oklahoma, with bilingual support in Spanish, so you can ask your questions in the language you're most comfortable in. If you've been wondering about this for a while, an evaluation is a straightforward place to start.
To schedule, text or call us at 903-957-0275.
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