PCOS and Its Impact on Fertility: Causes and Treatment

Polycystic ovary syndrome (PCOS) is a chronic hormonal and metabolic condition affecting approximately 8 to 13% of women of reproductive age, according to the World Health Organization. It is the most common cause of anovulation and one of the leading reasons for delayed pregnancy. Despite its name, most women with PCOS can achieve pregnancy with a structured treatment plan and careful monitoring.

What is polycystic ovary syndrome?

PCOS is characterised by an imbalance in reproductive hormones — relatively elevated luteinising hormone (LH) and androgens, alongside insulin resistance in most cases. It is diagnosed using the internationally accepted Rotterdam criteria endorsed by ESHRE and the American Society for Reproductive Medicine (ASRM), which require two of three features:

• Irregular or absent ovulation
• Clinical or biochemical signs of high androgens
• Polycystic appearance of the ovaries on ultrasound

Main symptoms

Symptoms vary widely, but the most common include:

• Irregular or infrequent menstrual periods
• Excess facial, chest, and abdominal hair (hirsutism)
• Acne and oily skin
• Weight gain, particularly around the waist, and difficulty losing weight
• Androgenetic scalp hair thinning
• Difficulty conceiving
• Skin darkening in folds such as the neck and underarms (acanthosis nigricans)

How PCOS affects fertility

PCOS impacts fertility through several mechanisms:

• Disrupted or absent ovulation
• A hormonal environment that is not optimal for egg maturation
• Insulin resistance, which can affect egg quality and implantation
• Increased risk of ovarian hyperstimulation when fertility medications are used
• A modestly higher rate of early miscarriage

The ASRM emphasises that, with a well-structured stepwise plan, most women with PCOS will achieve a successful pregnancy.

Comprehensive diagnosis

Accurate diagnosis requires a structured workup:

• Hormonal blood tests (LH, FSH, estradiol, total and free testosterone, DHEAS, AMH)
• Thyroid function and prolactin to exclude other causes
• Insulin resistance assessment (fasting glucose and insulin, HbA1c, oral glucose tolerance test)
• Lipid profile to evaluate metabolic risk
• Transvaginal ultrasound to assess ovarian volume and follicle count

Treatment options

Treatment is hierarchical — starting with the least invasive option and escalating based on response, in line with the 2023 International ESHRE PCOS Guidelines.

Step 1: Lifestyle modification

Losing 5 to 10% of body weight can restore regular ovulation in many cases. A diet low in refined carbohydrates, at least 150 minutes of moderate physical activity per week, and good sleep and stress management are the cornerstones of management.

Step 2: Medical therapy

• Letrozole is now the first-line ovulation induction agent under both ESHRE and ASRM guidance, with evidence of superiority to clomiphene in PCOS
• Metformin improves insulin sensitivity and is used alone or in combination with ovulation induction
• Myo-inositol is a supportive supplement with evidence for improved egg quality in some studies

Step 3: Gonadotropin injections

When oral medications do not result in ovulation, low-dose step-up gonadotropin injections are used with close ultrasound monitoring to minimise the risk of multiple pregnancy and hyperstimulation.

Step 4: Laparoscopic ovarian drilling

A simple surgical option that restores ovulation in a subset of women who do not respond to oral medications, by reducing intra-ovarian androgen concentration.

Step 5: IVF

When earlier options fail or other infertility factors coexist, IVF is highly effective. PCOS ovaries respond strongly to stimulation, so antagonist protocols with adjusted dosing are typically used to avoid hyperstimulation.

Success rates

Published evidence indicates that:

• 70 to 80% of women with PCOS ovulate with letrozole
• Cumulative pregnancy rates with ovulation induction and timed intercourse reach approximately 50% across 6 cycles
• IVF live birth rates in PCOS match or exceed the age-matched general infertility population when protocols are appropriately tailored

Lifestyle and prevention of long-term complications

PCOS is not only a fertility issue but a chronic metabolic condition requiring lifelong monitoring. International guidelines recommend:

• Weight management to reduce the risk of type 2 diabetes, cardiovascular disease, and hypertension
• Periodic screening of glucose and lipid profile every 1 to 3 years
• Endometrial monitoring, particularly when periods are very infrequent, to reduce the risk of endometrial hyperplasia
• Mental health support, as anxiety and depression rates are higher in PCOS

When to consult a specialist

Seek specialist evaluation if:

• Menstrual cycles are absent or irregular for more than three months
• Conception has not occurred after 12 months (or 6 months if you are 35 or older)
• Androgenic symptoms (excess hair, severe acne) are affecting quality of life
• There is rapid weight gain with signs of insulin resistance

Frequently asked questions

Does PCOS make pregnancy impossible?

No. PCOS delays conception but does not prevent it. With appropriate diagnosis and treatment, the vast majority of women achieve a healthy pregnancy.

Does PCOS return after treatment?

PCOS is a chronic condition that persists through the reproductive years, but symptoms improve significantly with weight and lifestyle management, and may ease after menopause.

Is PCOS inherited?

There is a strong familial pattern. Having an affected mother or sister increases the likelihood, but lifestyle and environment are also important contributors.

Should carbohydrates be avoided completely?

No. The recommendation is to reduce added sugars and refined carbohydrates while focusing on whole-grain carbohydrates, legumes, and vegetables, balanced with adequate protein and healthy fats.

Sources

• International Evidence-based Guideline for PCOS (ESHRE), 2023 update.
• American Society for Reproductive Medicine (ASRM). Practice Committee opinions on PCOS.
• National Institute for Health and Care Excellence (NICE). Fertility problems, Clinical Guideline CG156.
• World Health Organization (WHO). Fact sheet on polycystic ovary syndrome.
• Rotterdam ESHRE/ASRM-Sponsored PCOS Consensus Workshop.
• Cochrane Database of Systematic Reviews. Letrozole versus clomiphene for ovulation induction in PCOS.

Medical disclaimer

This article provides general medical information for educational purposes only. It is not a substitute for personal medical advice, diagnosis, or treatment from a qualified healthcare professional. Every patient's situation is different. Please consult Dr. Haytham Ibrahim or an appropriately qualified specialist before making any decisions about PCOS or fertility treatment.