Does PCOS Cause Infertility? What the Evidence Says

The short answer

Yes, but not permanently for most women. Polycystic ovary syndrome (PCOS), recently renamed polyendocrine metabolic ovarian syndrome (PMOS), is the most common cause of anovulation and a leading cause of infertility, because hormonal imbalance keeps the ovary from releasing an egg regularly. [1] The important word is treatable: many women with the condition still conceive, and medicines that restore ovulation work well. In the largest head-to-head trial, letrozole led to a live birth in 27.5% of women versus 19.1% on clomiphene. [4] So PCOS disrupts fertility, but for most it is a condition to manage with a clinician, not a verdict. [2] [3]

What you’ll learn

Polycystic ovary syndrome (PCOS) is the most common cause of anovulation and a leading cause of infertility, because the ovary does not release an egg on a regular schedule. [1]
It is not a life sentence for fertility: many women with the condition conceive, and ovulation-inducing treatment restores fertility for many. [2] [3]
In the largest trial, letrozole produced a live birth in 27.5% of women with the condition versus 19.1% with clomiphene. [4]
The condition is lifelong. Even after the fertility years, its insulin resistance and cardiovascular and endometrial risks persist and rise after menopause, so screening continues to matter. [1]
The condition was renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026 to reflect that it is a whole-body hormonal and metabolic disorder, not just a problem of ovarian cysts.

If you have polycystic ovary syndrome (PCOS) and are trying to conceive, the blunt question is usually this: does PCOS actually cause infertility, or just make it harder?

The honest answer is that the condition is the most common cause of anovulation, the failure to release an egg, and a leading cause of infertility worldwide. [1] But "cause of infertility" is not the same as "cannot get pregnant." Many women with the syndrome conceive, and the ovulation problem at the heart of it is one of the more treatable causes of infertility. [2]

That distinction matters even more after 40, when the fertility question overlaps with perimenopause and when the condition quietly shifts from a fertility issue to a lifelong metabolic one.

Why PCOS disrupts fertility

PCOS, which was formally renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026 to reflect that it is a whole-body hormonal and metabolic disorder rather than a simple problem of ovarian cysts, works against fertility through one main mechanism: it interferes with ovulation.

The condition occurs when inappropriate hormonal signaling leads to higher-than-normal androgen levels and other hormonal imbalances. [1] With that signaling disrupted, an egg may not develop as it should, or it may not be released during ovulation. [2] No released egg means no chance to fertilize it that cycle. When this happens month after month, the result is the irregular or absent periods that many women with the syndrome know well, and the difficulty conceiving that follows.

How common, and how treatable

The condition is common and often silent. It affects an estimated 10 to 13 percent of reproductive-aged women, and up to 70 percent of affected women worldwide do not know they have it. [1] That means many women only discover it when they struggle to conceive.

The encouraging part is that the fertility problem responds to treatment. Many women with the condition can still get pregnant, and medicines that restore ovulation are effective. [2] The largest head-to-head trial compared two ovulation drugs in women with the syndrome and found that letrozole led to a live birth in 27.5 percent of women, compared with 19.1 percent on clomiphene, with higher ovulation rates as well. [4]

Article table: Question, What the evidence shows
Question	What the evidence shows
Is the condition a cause of infertility?	Yes, it is the most common cause of anovulation and a leading cause of infertility [1]
Can women with the condition conceive?	Many do, sometimes without treatment [2]
Does treatment help?	Ovulation-inducing medicines restore ovulation for many; letrozole outperformed clomiphene for live birth [3] [4]
Does it resolve at menopause?	No; the metabolic and cardiovascular risks persist and need ongoing screening [1]

For the full menu of options for this condition ranked by evidence, see PCOS treatments ranked by the evidence, and for a common adjunct medicine used in the syndrome, see metformin for PCOS after menopause.

The part that outlasts fertility

Here is what often gets missed. PCOS is a lifelong condition, and its fertility chapter is only one phase. Women with PCOS are at higher long-term risk for insulin resistance, type 2 diabetes, and obesity, and irregular periods can raise the risk of endometrial hyperplasia and endometrial cancer. [1]

Those risks do not switch off at menopause. If anything, insulin resistance and cardiovascular risk tend to rise with age, which is why women with the condition in their 40s and 50s benefit from continued metabolic screening, including blood sugar and cardiovascular checks, even after fertility is no longer the goal. For that side of the condition, see PCOS after menopause and insulin resistance and, for the same syndrome, PCOS diabetes screening after menopause.

Where the evidence is limited

The evidence on restoring ovulation is strong, but it is honest to note limits. Success rates vary with age, weight, insulin resistance, and whether other infertility factors are present, and the strongest trials studied women actively trying to conceive rather than every possible situation. [4] Fertility also declines with age independent of the condition, so a woman in her early 40s faces a different arithmetic than one in her late 20s. These are reasons to individualize the plan with a clinician, not reasons to assume treatment will not work.

Who this fits

This picture fits women with the condition who are trying to conceive and want to understand whether the diagnosis is a barrier or a manageable hurdle. For most, it is a hurdle that ovulation-focused treatment can lower.

It is a poor fit to self-diagnose the cause of infertility or to assume that irregular periods rule out pregnancy entirely. If you have gone several months without a period, have been trying to conceive without success, or have signs like heavy or unpredictable bleeding, those should be evaluated rather than waited out.

Red flags worth a clinician's eye

Periods that stop for several months, or very heavy or unpredictable bleeding, which needs evaluation to protect the uterine lining.
More than a year of trying to conceive without success (or six months if you are over 35), which is a reason to seek a fertility assessment.
Signs of high blood sugar or cardiovascular risk, which should be checked given the metabolic side of the condition.

What to ask your clinician

Is my infertility driven by the condition, or are there other factors to test for?
Am I ovulating, and if not, is an ovulation-inducing medicine like letrozole appropriate?
Would weight, insulin, or lifestyle changes improve my odds first?
Given my age, how urgent is starting treatment?
What screening do I need for blood sugar, cholesterol, and my uterine lining?
When should we consider a fertility specialist?

Bottom line

The condition does cause infertility, and it is the most common cause of the ovulation failure behind it. [1] But it is one of the more treatable causes: many women conceive, and ovulation-inducing treatment restores fertility for many, with letrozole leading to more live births than clomiphene in the largest trial. [2] [4]

The fuller truth is that PCOS is lifelong. In your 40s and beyond, the question shifts from fertility to protecting long-term metabolic and heart health, so the condition deserves attention with a clinician well past the years of trying to conceive. [1] [3]

References

[1] World Health Organization. Polycystic ovary syndrome. https://www.who.int/news-room/fact-sheets/detail/polycystic-ovary-syndrome

[2] MedlinePlus. Polycystic Ovary Syndrome. U.S. National Library of Medicine. https://medlineplus.gov/polycysticovarysyndrome.html

[3] Teede HJ, Tay CT, Laven J, et al. Recommendations from the 2023 international evidence-based guideline for the assessment and management of polycystic ovary syndrome. Eur J Endocrinol. 2023;189(2):G43-G64. https://pmc.ncbi.nlm.nih.gov/articles/PMC10505534/

[4] Legro RS, Brzyski RG, Diamond MP, et al. Letrozole versus clomiphene for infertility in the polycystic ovary syndrome. N Engl J Med. 2014;371(2):119-29. doi:10.1056/nejmoa1313517 https://pubmed.ncbi.nlm.nih.gov/25006718/

Common questions

Does everyone with PCOS have trouble getting pregnant?

No. PCOS raises the risk of infertility because it disrupts ovulation, but many women with the condition still conceive, sometimes without help. The challenge is irregular or absent ovulation, which treatment can often restore. [1] [2][1][2]

How does PCOS actually cause infertility?

Through anovulation. In the condition, hormonal signaling is disrupted and androgen levels run high, so a mature egg may not develop or may not be released during ovulation. Without regular ovulation, conception is harder, which is the core fertility problem. [1] [2][1][2]

Can treatment fix PCOS-related infertility?

Often, yes. Ovulation-inducing medicines like letrozole restore ovulation for many women, and weight and lifestyle changes help. In the largest trial, letrozole led to a live birth in 27.5% of women versus 19.1% with clomiphene. It is a treatable cause, not a permanent one. [3] [4][3][4]

Does PCOS infertility get worse with age?

Age reduces fertility for everyone, and the condition adds an ovulation problem on top. But it does not disappear at menopause; its metabolic and cardiovascular risks continue, so the focus shifts from fertility to long-term health screening in your 40s and beyond. [1][1]