Polycystic ovary syndrome (PCOS) is one of the most common causes of ovulation disorders and infertility in women. However, having PCOS does not mean you are infertile, nor does it mean that you will be unable to conceive naturally.
Some women only discover they have PCOS when they see a doctor about irregular periods. Others still have periods but ovulate erratically. And a good number of women only learn they have PCOS after months of trying to conceive.
So, does PCOS cause infertility? Can you conceive naturally with polycystic ovary syndrome? And when should you see a doctor?
What is PCOS?
🧬 PCOS – Polycystic Ovary Syndrome is a common endocrine disorder in women of reproductive age.
According to the World Health Organization (WHO), PCOS affects around 10–13% of women of reproductive age worldwide. It is also the most common cause of a failure to ovulate and one of the leading factors linked to female infertility.
PCOS can present differently from one woman to another, and it is usually associated with:
- Infrequent or irregular periods
- Absent or erratic ovulation
- High androgen levels
- Acne
- Excess facial or body hair growth
- Thinning hair or female-pattern hair loss
- Difficulty conceiving
- Weight gain or difficulty managing weight in some women
One point many women easily misunderstand:
👉 PCOS does not simply mean “ovaries with many follicles”.
According to the international PCOS guideline, in adult women the diagnosis is usually based on the presence of at least 2 of the 3 groups of features: ovulatory dysfunction, signs of raised androgens, and polycystic ovarian morphology on ultrasound or an equivalent criterion assessed by a doctor, once other causes have been ruled out. Simply seeing many follicles on an ultrasound is therefore not enough to conclude on your own that you have PCOS.
Does PCOS cause infertility?
The answer is: PCOS can make conceiving harder, but not every woman with PCOS is infertile.
The main problem usually lies with ovulation.
In a normal cycle, follicles develop, a mature egg is released from the ovary and has the chance to meet sperm and be fertilised.
In women with PCOS, hormonal imbalance, particularly involving androgens and metabolic mechanisms, can disrupt the development and release of the egg.
The result is:
PCOS → irregular ovulation or no ovulation → fewer chances of having an egg available for fertilisation → it may take longer to conceive.
ACOG also notes that the high androgen levels seen in PCOS can stop the ovaries from releasing an egg each month.
For example, a woman with regular cycles of around 28–30 days may have many opportunities to ovulate in a year.
By contrast, someone who has only 5–6 periods a year may ovulate considerably fewer times. This does not mean pregnancy is impossible, but the fertile “window” may appear less often.
Can you conceive naturally with PCOS?
💛 Yes.
The international PCOS guideline stresses that women with PCOS should be counselled that pregnancy is usually still achievable naturally or with the help of treatment.
The chance of conceiving depends on many factors, not on PCOS alone, for example:
- The woman's age
- The frequency and quality of ovulation
- Ovarian reserve
- The condition of the fallopian tubes
- Uterine health
- Weight and metabolic health
- The sperm quality of the husband or partner
- Any coexisting reproductive conditions
This is also why you should not assume that a couple will struggle to conceive simply because the woman has been diagnosed with PCOS.
In an infertility assessment, ASRM recommends looking at ovulatory function as well as the structure and patency of the female reproductive tract, alongside a semen analysis for the male partner where appropriate.
When should women with, or suspected of having, PCOS see a doctor?
There is no need to wait until you want a baby before being checked for PCOS.
1. Periods that are frequently irregular or very infrequent
🚩 This is one of the most important signs to watch for.
In women who are past the first few years after their periods began, a cycle is considered abnormal if it is regularly:
- Longer than 35 days
- Shorter than 21 days
- Fewer than about 8 cycles a year
The international PCOS guideline recommends considering an assessment for PCOS when cycles are abnormal in these ways.
If you used to have periods but suddenly stop menstruating for more than 3 months with no clear cause, ACOG also recommends a medical assessment.
2. You are trying to conceive but your periods are very infrequent or you suspect you are not ovulating
This point matters a great deal.
Many people have heard the rule:
“Just try for a baby for a year before seeking fertility care.”
But this rule does not apply in the same way to everyone.
According to ASRM:
- Women under 35 years of age, with no clear risk factors: assessment is usually carried out after around 12 months of regular, unprotected intercourse without conceiving.
- Women aged 35 and over: should be assessed after around 6 months.
- Women over 40 years of age: may need to be assessed sooner.
However, if there is already a condition affecting fertility, such as very irregular periods, infrequent periods or absent periods, the assessment can begin early without waiting the full 6–12 months.
👉 So if you already know you have PCOS and are planning a pregnancy, you can speak to an Obstetrics and Gynaecology doctor or a fertility specialist right from the start.
3. Signs of raised androgen hormones
Some women with PCOS have:
- Excess hair growth on the face, chin, chest or abdomen
- Extensive or persistent acne after puberty
- Oily skin
- Thinning hair or hair loss
These signs do not automatically mean PCOS, but if they appear alongside irregular periods, you should have further assessment.
4. Weight gain, difficulty managing weight or signs of insulin resistance
PCOS is closely linked with metabolic problems and insulin resistance.
Signs you may notice include:
- Gaining weight easily, especially around the abdomen
- Difficulty losing weight
- Darker, thicker skin on the neck, armpits or groin
- Abnormal blood sugar levels
WHO reports that women with PCOS are at higher risk of insulin resistance, type 2 diabetes, obesity and several other metabolic problems.
However:
⚠️ Not everyone with PCOS is overweight.
People with a normal BMI or a slim build can still have PCOS. You should therefore not rule out PCOS simply because you have not gained weight.
What is usually checked at a PCOS appointment?
No single test can confirm PCOS in every case.
Depending on your symptoms, age and pregnancy plans, the doctor may assess:
📋 Your menstrual cycle history
📋 Signs of excess hair growth, acne and hair loss
📋 Hormone tests relating to androgens
📋 Ultrasound of the uterus and ovaries when needed
📋 Blood sugar and metabolic factors
📋 Cholesterol and triglycerides
📋 Blood pressure
📋 Tests to rule out other causes of irregular periods
The international PCOS guideline also recommends assessing blood sugar status in anyone diagnosed with PCOS and checking the relevant cardiometabolic risk factors.
Another point to note:
A high AMH does not necessarily mean you have PCOS.
The international guideline recommends not using AMH as a standalone test to diagnose PCOS.
How is difficulty conceiving caused by PCOS treated?
Treatment depends on whether the woman is currently trying to conceive or not.
If a pregnancy is being planned, the goals usually focus on:
🌿 1. Optimising health before pregnancy
The doctor may give advice on:
- A suitable diet
- Physical activity
- Sleep
- Weight, if an adjustment is indicated
- Controlling blood sugar and any underlying conditions
- Appropriate preconception vitamin supplements
No single diet has been shown to be best for all women with PCOS. What matters is building a lifestyle you can sustain over the long term.
💊 2. Supporting ovulation
If the main cause of infertility is a failure to ovulate, the doctor may consider ovulation induction medication.
According to the 2023 international guideline, letrozole is preferred as the first-line medical treatment for ovulation induction in women with PCOS who are not ovulating and have no other cause of infertility. Other options may be considered case by case.
⚠️ Ovulation induction medication must be prescribed and monitored by a doctor; it should not be bought or used on the basis of someone else's experience.
🧪 3. IUI or IVF when needed
PCOS does not mean you will have to have IVF.
Many women conceive after improving their general health and receiving support for ovulation.
IVF is usually considered when:
- Earlier ovulation induction methods have not worked
- There is an additional cause of infertility
- Age and the duration of infertility mean further delay is no longer appropriate
- The doctor determines that assisted reproduction is indicated
The international guideline also notes that, in women with PCOS undergoing IVF, the risk of ovarian hyperstimulation syndrome (OHSS) is higher, so the stimulation protocol needs to be individualised and monitored by specialists.
Does PCOS ever go away completely?
PCOS is regarded as a chronic condition that can affect health across many stages of life.
There is currently no way to “cure” PCOS completely, but the symptoms and associated risks can be managed effectively with lifestyle changes, medication and fertility treatment when needed.
The goal is therefore not only “how do I get pregnant”, but also long-term monitoring of:
- The menstrual cycle
- Blood sugar
- Blood pressure
- Blood lipids
- Endometrial health
- Mental health
- Reproductive plans
Does PCOS cause infertility? The key points to remember
💛 PCOS can make becoming pregnant harder, mainly because it disrupts or prevents ovulation. But PCOS does not mean permanent infertility.
Many women with PCOS are still able to:
✔️ Ovulate and conceive naturally
✔️ Conceive after making suitable lifestyle changes
✔️ Conceive with the help of ovulation induction
✔️ Use IUI or IVF when indicated
The important thing is not to wait too long once your body is giving clear signals.
If your periods are frequently longer than 35 days, your periods are absent for a long time, you develop unusual excess hair growth or acne, or you are trying to conceive with very irregular cycles, consider an appointment in Obstetrics and Gynaecology or Fertility care for an accurate assessment.
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Detecting PCOS early matters not only for your pregnancy plans, it also helps you take charge of your hormonal and metabolic health over the long term.
References
📚 World Health Organization (WHO) – Polycystic Ovary Syndrome, updated January 2026.
📚 American College of Obstetricians and Gynecologists (ACOG) – Polycystic Ovary Syndrome (PCOS).
📚 American College of Obstetricians and Gynecologists (ACOG) – Amenorrhea: Absence of Periods.
📚 American Society for Reproductive Medicine (ASRM) – Fertility Evaluation of Infertile Women.
📚 International Evidence-based Guideline for the Assessment and Management of PCOS – 2023.
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