PCOS and Fertility: How It Affects Conception and What Can Help

PCOS, polycystic ovary syndrome, affects fertility mainly by disrupting ovulation: a hormone imbalance makes cycles irregular or absent, so an egg is released less predictably or not at all. That is the core of it, and it is also the reason PCOS is one of the most treatable causes of difficulty conceiving. PCOS is common, affecting roughly 1 in 10 women of reproductive age, so if this is you, you are far from alone.

How PCOS affects conception

PCOS affects conception by interfering with ovulation, the monthly release of an egg. In PCOS, follicles in the ovary often start to develop but do not mature and release an egg the way they should. The result is long, irregular, or absent cycles, which means fewer chances each year for sperm and egg to meet. It is this disrupted ovulation, rather than the ovaries themselves, that is the usual obstacle to getting pregnant.

Insulin resistance frequently sits behind the picture: higher insulin levels can push the ovaries to make more male-type hormones (androgens), which further unsettles ovulation. That is why a higher weight can worsen symptoms and why the same hormone imbalance can show up as acne or excess hair. PCOS is the most common cause of ovulation-related infertility, but ovulation can usually be encouraged, which is the hopeful part. For how this fits the wider landscape, see causes of infertility.

When my own periods stretched to forty-odd days apart, I spent months tracking ovulation that sometimes simply was not happening. Realising the problem was a timing one, not a closed door, was the moment the whole thing started to feel workable rather than frightening.

How PCOS is diagnosed

PCOS is diagnosed using the Rotterdam criteria: you need two of three features present, with other conditions excluded. The three features are irregular or absent ovulation (long or missing periods), signs of raised androgens (either on a blood test or as acne and excess hair growth), and polycystic-looking ovaries on an ultrasound scan. Because only two of the three are required, not everyone with PCOS has visibly “polycystic” ovaries, and the cysts are really many small under-developed follicles rather than true cysts.

Your GP will usually arrange blood tests and a pelvic ultrasound, and rule out other causes of irregular cycles, such as thyroid problems, before confirming the diagnosis. If you are trying to conceive, this overlaps with the wider work-up covered in fertility tests and investigations. The practical takeaway from the canonical advice holds here too: do not delay. If your periods are irregular or absent, see your GP, because treatable causes are far easier to act on early.

Lifestyle changes that help

For people with PCOS, lifestyle is the recommended first step, and it can make a real difference to ovulation. NICE advises that for those above a healthy weight, losing even about 5 percent of body weight can help restore more regular cycles and improve the chance of conceiving. A balanced diet, regular activity, and not smoking all support this, and reducing insulin resistance is the mechanism that often gets ovulation going again.

It is important to be honest about the limits: weight is not the whole story, plenty of people with PCOS are not overweight, and lifestyle change is hard and sometimes slow. It is one evidence-based lever among several, not a moral test or a guaranteed cure. We set out the broader evidence in diet and lifestyle for fertility, and the basics of timing intercourse in how to get pregnant when trying to conceive.

Medical treatment to restore ovulation

When lifestyle changes alone do not bring regular ovulation, the next step is ovulation induction: medication to prompt the ovary to release an egg. Letrozole is now commonly used first line, and clomifene is a long-established alternative; both are tablets taken early in the cycle, with monitoring to check how the ovaries respond. If tablets do not work, options include injectable hormones (gonadotrophins) or a minor surgical procedure called ovarian drilling.

Monitoring matters because ovulation-induction drugs raise the chance of releasing more than one egg, and therefore of twins or more. Your clinic will track your response with scans for that reason. PCOS also carries a higher risk of ovarian hyperstimulation syndrome (OHSS) during stimulated treatment, so doses are kept careful and you are watched closely.

When IVF is considered

IVF is considered for PCOS when lifestyle changes and ovulation induction have not led to a pregnancy, or where other factors (such as blocked tubes or a male-factor issue) are also present. It is not the first option for most people with PCOS, but it is an effective one, and PCOS ovaries often respond well, producing a good number of eggs. The flip side of that strong response is a higher OHSS risk, which clinics manage with gentler protocols and, often, a “freeze-all” approach that delays embryo transfer.

For what an IVF cycle actually involves, see IVF explained, and remember that age remains the strongest single predictor of success, as covered in IVF success rates. Across all of these routes, many people with PCOS do go on to conceive.

This is general information and support, not medical advice. For a diagnosis and a plan that fits you, please consult your GP or a fertility specialist.