There may be a link between polycystic ovary syndrome (PCOS) and miscarriage, but it is not a straightforward one. Some studies suggest people with PCOS have a higher risk of miscarriage than those without the condition, and much of that increased risk appears to be driven by related metabolic factors rather than PCOS on its own.

Many people with PCOS go on to have healthy pregnancies.

If you have PCOS and have experienced a loss, it is natural to wonder whether the two are connected. Here is what doctors currently understand.

What is PCOS?

PCOS is a hormonal condition that affects how the ovaries function. It affects an estimated 6–13% of people of reproductive age, and is a common cause of infertility, mainly because of problems with ovulation.

Common features include:

• irregular or absent periods

• higher levels of androgens (sometimes called "male" hormones)

• polycystic-appearing ovaries on ultrasound

• difficulty with ovulation

Does PCOS increase miscarriage risk?

Some studies have found miscarriage rates may be higher in people with PCOS, particularly in early pregnancy. The association may be influenced by factors commonly seen alongside PCOS, including insulin resistance, hormonal imbalances, inflammation, higher androgen levels, and metabolic factors such as weight.

These factors are associated with miscarriage risk, but their exact role in causing pregnancy loss is not fully understood. Association is not the same as cause, and the research here is still developing.

Why might PCOS be linked to miscarriage?

Insulin resistance

Many people with PCOS have insulin resistance, which may influence hormone regulation and the metabolic processes that matter in early pregnancy.

Hormonal imbalances

Higher androgen levels and irregular ovulation may affect ovulation and early pregnancy processes, although the evidence is still evolving.

Metabolic factors

Conditions that sometimes occur alongside PCOS, including metabolic syndrome, can also affect pregnancy. Weight is part of this picture — and it's worth saying plainly that PCOS itself makes weight harder to manage. That is a feature of the condition, not a matter of effort.

In some studies, the increased risk appears to be driven more by these associated metabolic factors than by PCOS itself.

None of this means miscarriage is inevitable for people with PCOS.

What treatment can help reduce risk?

Doctors may recommend addressing some of the underlying factors associated with PCOS. This can include:

• addressing metabolic factors such as insulin resistance

• support with weight, where your doctor thinks it would help

• medications that support ovulation

• closer monitoring in early pregnancy

Some studies have explored treatments such as metformin or progesterone support in specific situations, though the evidence is mixed and recommendations vary between clinicians and countries.

When should you speak with your doctor?

Your healthcare provider may recommend further evaluation or fertility support if you have PCOS alongside:

• recurrent miscarriage (two or more losses)

• difficulty conceiving

• irregular menstrual cycles

Specialists can assess hormone levels, metabolic factors and ovulation patterns to guide treatment. If you'd like to know what that investigation actually involves and when it's usually offered, How Do Doctors Test for the Cause of a Miscarriage walks through it. For what follow-up care looks like more generally, see When Should You Get a Check-Up After a Miscarriage.

If you're wondering whether this was your fault

Most miscarriages happen because of random chromosomal changes in the embryo, and that is true whether or not you have PCOS. Having a condition that is statistically associated with higher risk is not the same as having caused a loss.

Living with PCOS often means years of being told to manage something that resists being managed. If a loss has landed on top of that, the pull towards self-blame can be very strong. It is worth knowing that the research does not support it.

Key takeaways

• PCOS is associated with hormonal and metabolic changes that may carry a higher risk of miscarriage.

• The connection is complex, and risk varies widely between individuals.

• Much of the increased risk appears to relate to associated metabolic factors rather than PCOS alone.

• Many people with PCOS have healthy pregnancies.

• A healthcare provider can recommend personalised care based on your medical history.

Related reading

For the wider picture of what causes miscarriage beyond PCOS, read What Causes Miscarriage? Common Myths vs. Medical Facts. If your loss happened during fertility treatment, Coping With a Miscarriage During IVF or IUI covers the particular grief that comes with that.