PCOS and Fertility: What Every Woman Should Know

Polycystic Ovary Syndrome (PCOS) is the most common hormonal disorder in women of reproductive age, affecting approximately 1 in 8. It is also one of the leading causes of irregular periods and difficulty conceiving — yet it is frequently misunderstood, misdiagnosed, and undertreated.

What Is PCOS?

PCOS is a hormonal imbalance characterised by elevated androgens (male hormones), irregular or absent ovulation, and — in many but not all cases — multiple small follicles visible on the ovaries on ultrasound. The name is slightly misleading: the "cysts" are not true cysts but immature follicles that have failed to ovulate. You do not need to have polycystic ovaries on scan to be diagnosed with PCOS.

Diagnosis is based on the Rotterdam criteria: at least two of three features must be present — irregular periods (fewer than 9 per year), biochemical or clinical signs of elevated androgens (excess hair growth, acne, scalp hair thinning), and a polycystic ovarian morphology on ultrasound.

How Does PCOS Affect Fertility?

The primary fertility impact of PCOS is anovulation — cycles in which no egg is released. Without ovulation there can be no conception. The hormonal environment in PCOS also often impairs egg quality and, in some cases, endometrial receptivity (the uterine lining's ability to support implantation).

That said, PCOS is not a sentence of infertility. The vast majority of women with PCOS who want to conceive can do so — often with relatively straightforward treatment. The challenge is predicting which patients will need minimal intervention and which will require more advanced assisted reproduction.

Treatment Options — From Simple to Advanced

Lifestyle modification. For women who are overweight, even a 5–10% reduction in body weight can restore ovulation and lead to spontaneous conception. This is always the first step where relevant, as it also improves the response to any subsequent medical treatment.

Ovulation induction. Medications such as letrozole (first line) or clomiphene citrate stimulate the ovaries to produce and release one or two eggs. This is timed with ultrasound monitoring and, if sperm parameters are normal, can result in conception through natural intercourse or intrauterine insemination (IUI).

Gonadotrophin injections. If oral medication does not work, low-dose FSH injections can induce ovulation. These require close monitoring due to the risk of ovarian hyperstimulation (OHSS), to which women with PCOS are more susceptible.

IVF. For women who do not respond to simpler treatments, or who have additional fertility factors, IVF is highly effective in PCOS. Modified protocols that minimise OHSS risk (GnRH antagonist + trigger, freeze-all strategy) make IVF safe and well-tolerated for most patients with PCOS.

Managing PCOS Beyond Fertility

PCOS has implications beyond reproduction. Long-term elevated insulin and androgen levels are associated with an increased risk of type 2 diabetes, cardiovascular disease, and endometrial cancer (from chronic anovulation and unopposed oestrogen). Regular monitoring, a healthy diet, physical activity, and — where indicated — metformin or hormonal therapy are important regardless of whether conception is the immediate goal.

If you have been told you have PCOS and are thinking about starting a family, a consultation with a fertility specialist will help map out the most appropriate — and least invasive — treatment path for your specific situation.