Polycystic Ovarian Syndrome & Infertility

What is Polycystic Ovarian Syndrome (PCOS)?

Polycystic Ovary Syndrome (PCOS) is a common hormonal disorder that affects women of reproductive age. It is characterised by a combination of symptoms, including irregular menstrual periods/ovulation, elevated androgen levels, and polycystic ovaries, which may be enlarged and contain numerous small cysts. It is one of the most common causes of female infertility.

How Does PCOS Affect Fertility?

PCOS interferes with fertility in several ways:

• Irregular Ovulation: Hormonal imbalance leads to infrequent or absent ovulation.
• Poor Egg Development: Eggs may begin developing but fail to mature fully.
• Elevated Androgens: Higher levels of male-type hormones can disrupt normal ovarian function.
• Insulin Resistance: Many women with PCOS have insulin resistance, which worsens hormonal imbalance and affects ovulation.
• Endometrial Changes: Irregular cycles may affect the uterine lining, reducing the chance of successful implantation.

Some women with PCOS may ovulate occasionally but unpredictably. This can make timing conception very challenging.

Risk Factors for PCOS-Related Infertility

Not all women with PCOS experience infertility. However, risk is higher in those who have:

• Very Irregular or Absent Periods: Suggesting consistent anovulation.
• Obesity or Significant Weight Gain: Excess weight can worsen insulin resistance.
• Severe Hormonal Imbalance: Markedly elevated androgen levels.
• Longstanding Untreated PCOS: Delayed management may increase fertility challenges.
• Metabolic Syndrome or Diabetes: Underlying insulin issues can significantly impact ovulation.

Women over 35 with PCOS may face compounded challenges, as natural egg quality also declines with age.

Symptoms of PCOS-Related Infertility?

The main symptom is difficulty falling pregnant. However, other signs may suggest ovulatory dysfunction:

• Irregular or Absent Periods
• Very Light or Very Heavy Cycles
• Difficulty Predicting Ovulation
• Excess Facial or Body Hair
• Persistent Acne
• Weight Gain or Difficulty Losing Weight

Some women only discover PCOS during fertility investigations.

Diagnosis of PCOS-Related Infertility

Diagnosis involves confirming both PCOS and ovulatory dysfunction. Assessment may include:

• Detailed Medical History: Menstrual pattern, weight changes, symptoms.
• Blood Tests: Hormone levels including LH, FSH, testosterone, AMH, insulin and thyroid function.
• Ultrasound Scan: To assess ovarian appearance and follicle count.
• Ovulation Testing: Progesterone blood tests or ovulation tracking.
• Metabolic Screening: Blood sugar and cholesterol levels.

In addition to assessing PCOS, your partner may require semen analysis to ensure there are no male factor fertility issues contributing to difficulty conceiving.

Treatment Options for PCOS-Related Infertility

Treatment depends on individual factors such as age, weight, hormonal profile, and duration of infertility.

Lifestyle Optimisation

For many women, modest weight loss (5–10% of body weight) can significantly improve ovulation.

• Balanced Nutrition: Lower glycaemic index diet.
• Regular Exercise: Improves insulin sensitivity.
• Weight Management Support: If appropriate.

Lifestyle intervention alone can restore natural ovulation in some women.

Ovulation Induction Medications

If ovulation does not occur naturally, medication can be used to induce ovulation.

• Letrozole: Often first-line treatment and highly effective.
• Clomiphene Citrate: Previously standard therapy.
• Metformin: Particularly helpful if insulin resistance is present.
• Gonadotropin Injections: Used if oral medications are unsuccessful.

These treatments are carefully monitored with ultrasound and blood tests to reduce risks such as multiple pregnancy.

Assisted Reproductive Technology

If ovulation induction is unsuccessful:

• Intrauterine Insemination (IUI): Combined with ovulation stimulation.
• In Vitro Fertilisation (IVF): Particularly useful in resistant cases or if other fertility factors are present.

Women with PCOS may respond strongly to IVF medications, so careful specialist management is essential to minimise ovarian hyperstimulation syndrome (OHSS).

PCOS Treatment Success Rates

PCOS is one of the most treatable causes of infertility.

• High Ovulation Success Rates: With medication, many women resume ovulation.
• Strong Pregnancy Outcomes: Particularly in younger women.
• Good IVF Response: Due to high ovarian reserve in many PCOS patients.

Early intervention improves outcomes significantly.

Can PCOS-Related Infertility Be Prevented?

While PCOS itself cannot be fully prevented, its impact on fertility can often be reduced.

• Early Diagnosis: Early symptom management can protect reproductive health.
• Healthy Weight Maintenance: Reduces insulin resistance.
• Regular Exercise: Supports hormonal balance.
• Monitoring Cycles: Early review if periods become irregular.
• Metabolic Screening: Prevents long-term complications.

Women diagnosed in adolescence or early adulthood benefit from ongoing monitoring if they plan a future pregnancy.

What are the Risks During Pregnancy?

Women with PCOS may have slightly higher pregnancy risks, including:

• Gestational Diabetes
• Pregnancy-Induced Hypertension
• Miscarriage
• Preterm Birth

With appropriate antenatal care and monitoring, most women have healthy pregnancies and babies.

What if PCOS-Related Infertility is Untreated?

Untreated PCOS may lead to:

• Ongoing Difficulty Conceiving
• Emotional Stress and Relationship Strain
• Irregular Uterine Lining Build-Up: Increasing risk of endometrial issues.
• Metabolic Complications: Diabetes and cardiovascular disease later in life.

Seeking early fertility assessment improves both reproductive and long-term health outcomes.

When Should You Seek Help?

• Under 35: After 12 months of trying to conceive.
• Over 35: After 6 months of trying.
• Very Irregular Periods: Seek assessment earlier.
• Known PCOS Diagnosis: Pre-conception consultation is recommended.

Early, proactive care provides clarity, reassurance, and a structured pathway forward.