PCOS and Fertility — Why Early Diagnosis Matters More Than Ever

PMOS (Polyendocrine Metabolic Ovarian Syndrome), also widely known as PCOS (Polycystic Ovary Syndrome), was renamed in May 2026 by global consensus in The Lancet. The new name reflects that it is not just an ovarian cyst condition but a long-term endocrine and metabolic disorder affecting hormones, metabolism and the ovaries. Worldwide, it affects 1 in 8 women of reproductive age.

India has a disproportionately high incidence of PCOS compared to other countries. PCOS prevalence rates vary widely depending on the population studied and how diagnoses are made — researchers studying PCOS in India have estimated its prevalence to be anywhere from 4% to over 20% [1,2]. Even though PCOS is so prevalent, it is often undiagnosed or misdiagnosed until a couple has tried unsuccessfully to conceive for at least one year.

While PCOS diagnosis is delayed, the body is not static during that time. The underlying hormonal and metabolic abnormalities that contribute to PCOS continue to develop in the background — during the period between the appearance of symptoms and a definitive diagnosis. Diagnosing PCOS at an early stage — as a teenager or young adult prior to contemplating pregnancy — provides a unique opportunity to protect future fertility, as opposed to simply reacting after fertility has become impaired.

What Is Actually Happening in the Body

PCOS is typically described as an issue with only the ovaries. This is inaccurate. PCOS should be seen as a systemic endocrine disorder that has a significant impact on the body's metabolism and is most obvious in the menstrual cycle.

Two major mechanisms drive PCOS. The first is insulin resistance. Women with PCOS — regardless of whether they are overweight — have cells that do not respond well to insulin. Because the body cannot use insulin effectively, the pancreas produces more insulin than normal. This excess insulin does not just affect blood sugar levels — it also causes the ovaries to produce more androgens, the "male" hormones like testosterone that all women produce in small quantities [2].

High levels of androgens cause hyperandrogenism [2], which disrupts the complex signalling necessary for a single egg to mature and be released each month. Instead, multiple small follicles start growing simultaneously and then stop before reaching maturity — the pattern seen on ultrasound that gave the condition its original name.

Insulin resistance leads to excessive androgen production. Excessive androgen production interferes with ovulation. These two events lead to the majority of infertility problems caused by PCOS.

How PCOS Affects the Chances of Conceiving

When trying to conceive naturally, several things need to happen in sequence: an egg must develop and mature, be released, meet sperm, and then a fertilised egg must implant into a uterine lining prepared for it. PCOS can affect multiple parts of this process.

The first part affected is ovulation itself. If ovulation is irregular or absent, it is difficult to time conception. Some women with PCOS will not ovulate for months at a time. The quality of the eggs released during ovulation may also be affected — high androgen levels and chronic low-grade inflammation associated with PCOS can create an environment that changes how an egg develops.

PCOS also affects the lining of the uterus. After ovulation, the body produces progesterone to prepare the lining for implantation. If progesterone is insufficient, the lining is exposed to constant oestrogen, which can make it difficult for an embryo to implant. Women with PCOS also have a slightly higher chance of experiencing an early pregnancy loss [2] — believed to be due to elevated luteinising hormone (LH), insulin resistance and other hormonal changes.

While these issues make conception more difficult, they do not make it impossible. They simply mean the path to pregnancy may require more assistance than it would under typical circumstances.

Why Indian Women Experience a Different Version of PCOS

According to clinical data, South Asian women experience a more severe form of PCOS than what is typically documented in Western medical literature — with earlier onset, more severe insulin resistance, and metabolic effects that manifest at lower body weights [2, 5, 6].

Globally, PCOS-related metabolic disorders are typically identified based on a BMI greater than 25 [5]. For South Asian women, however, the threshold is significantly lower — approximately 23 [6] — explaining why many Indian women with apparently normal body weight can still experience substantial underlying insulin resistance.

Physicians refer to this phenomenon as "lean PCOS," and it is clinically significant because it is easily overlooked. A thin patient with seemingly regular (but in fact irregular) menstrual cycles does not fit the stereotype many individuals associate with PCOS. In addition, Indian women with PCOS face a greater likelihood of developing insulin resistance, metabolic syndrome and early Type 2 diabetes [6]. One recognisable sign is acanthosis nigricans [5] — dark, thick patches of skin at the neck, underarms or elbows — which indicates elevated insulin levels.

Importantly, while symptoms commonly emerge in women in other regions during their late twenties, symptoms frequently develop in Indian women between the ages of 15 and 20 [6] — emphasising why early identification during school and college years is essential.

Why Early Diagnosis Changes the Fertility Story

In the past, the unsaid clinical practice was to not treat PCOS until a woman had been unsuccessfully attempting to get pregnant. The current trend is to diagnose PCOS during adolescence or early adulthood — well before fertility is an issue. This provides several significant benefits.

Early diagnosis protects egg quality over time. Chronic low-grade inflammation associated with uncontrolled PCOS develops slowly. By addressing this at an earlier stage, a woman can help maintain ovarian health before the normal ageing process adds additional difficulties.

Early diagnosis also prevents longer-term metabolic problems such as diabetes, fatty liver and high cholesterol — all of which can increase risk for complications during pregnancy, including gestational diabetes and pregnancy-induced hypertension [4]. Perhaps most importantly, early intervention often restores ovulation independently. Structured weight loss programmes, regular physical activity and, if necessary, insulin-sensitising therapy can restore spontaneous, regular ovulation in approximately half to two-thirds of women with PCOS [3,4] — without requiring any fertility treatment.

Beyond the biological benefits, there is a simpler advantage. Knowing your reproductive profile years ahead of time allows a woman or couple to plan when they want to become pregnant based on their own timeline — rather than discovering a fertility problem after years of trying.

How PCOS Is Actually Diagnosed

In India, clinicians typically utilise the Rotterdam criteria [3], supported by the Indian Fertility Society and consistent with international guidelines [4]. A diagnosis of PCOS requires a minimum of two of the following three criteria to be present, after ruling out other potential causes like thyroid disease:

1. Irregular menstrual cycles: A history of irregular, infrequent or absent menstrual cycles due to anovulation or oligo-ovulation.
2. Signs of hyperandrogenism: Physical manifestation through excessive facial or body hair (hirsutism), chronic acne, and/or elevated serum testosterone levels.
3. Polycystic ovarian appearance: Polycystic appearance of the ovaries on ultrasonography.

Two important considerations apply. For adolescents, physicians deliberately avoid using the ultrasound criterion because it is common for adolescent ovaries to appear somewhat polycystic during normal development — so cycle irregularity and androgen excess are used instead [5]. Additionally, AMH (anti-Müllerian hormone) has emerged as an alternative blood-based biomarker for assessing ovarian morphology in adult women [4].

What Treatment Actually Looks Like

Most of the time, the first and most important intervention for PCOS is not a prescription — it is lifestyle change. Lifestyle modifications can greatly affect how a woman's body functions, and often a few simple changes to daily routine can significantly improve the ability to ovulate.

A diet rich in whole grains, pulses (dal, rajma, chana), vegetables and lean proteins — while limiting refined sugar and processed foods — can meaningfully improve insulin sensitivity. Moderate physical activity of approximately 150 minutes per week also plays a significant role. In some cases, losing just 5-10% of total body weight can restore ovulation [4]. The supplement myo-inositol has also shown evidence of improving insulin sensitivity and supporting egg quality [4].

If lifestyle changes alone are insufficient, medications may be needed. Letrozole [3] is commonly used to stimulate ovulation, sometimes used alongside metformin [4] in women with insulin resistance. Both are well-established medications with strong safety and efficacy profiles.

For a small number of women who do not respond to these methods, additional options exist — including injectable fertility drugs, ovarian drilling (a minor surgical procedure) or, where other fertility factors are also present, IVF. These are typically reserved for after less invasive methods have been tried, and are determined by a fertility specialist based on individual circumstances.

💡 What Every Patient Should Take Away

Most women with PCOS will successfully get pregnant — often through relatively straightforward treatments, and sometimes through lifestyle change alone. Timing is everything.

If you have a history of irregular periods, unexplained weight changes, skin discolouration (dark patches at the neck or underarms), or excessive body or facial hair — see a doctor now, rather than waiting until you want to become pregnant. The sooner PCOS is identified, the greater the number of choices available and the more straightforward the journey to parenthood is likely to be.

If you recognise any of the symptoms described above in yourself, discuss them with a gynaecologist or reproductive health specialist. That conversation is better had now than years from now.

#PCOS #PCOSIndia #PCOSAndFertility #HealthierTomorrow #WomensHealth #PCOSAwareness #FertilityIndia #HormonalHealth #InsulinResistance #LeanPCOS