Yes, PMOS can affect fertility and pregnancy, mainly because PMOS can interfere with ovulation, menstrual cycles and reproductive hormones. However, having PMOS does not mean that pregnancy is impossible. Many women with PMOS become pregnant naturally, while others may need fertility treatment to help achieve pregnancy.
PMOS stands for Polyendocrine Metabolic Ovarian Syndrome, the new name for the condition previously known as Polycystic Ovary Syndrome (PCOS). In 2026, the American Society for Reproductive Medicine (ASRM) endorsed the name change from PCOS to PMOS. The updated name reflects the fact that PMOS is a complex hormonal and metabolic condition that affects more than the ovaries.
For women trying to conceive, understanding the relationship between PMOS and fertility is important. PMOS can affect how often ovulation occurs, but its effect is different from one woman to another. Some women with PMOS ovulate regularly and become pregnant naturally. Others experience irregular or absent ovulation and may require medical support.
If you have PMOS and are trying to conceive, understanding how PMOS affects ovulation, natural pregnancy, pregnancy risks and fertility treatment can help you make informed decisions about your reproductive health.
What Is PMOS and How Does It Affect Fertility?
PMOS is a hormonal and metabolic condition that can affect women during their reproductive years. PMOS can cause changes in ovulation, menstrual cycles and androgen levels and may also be associated with metabolic health concerns.
According to the current international terminology, PMOS is diagnosed based on the presence of two of three key features after other causes have been excluded: ovulatory dysfunction, hyperandrogenism and polycystic ovarian morphology.
One of the most important ways PMOS affects fertility is through ovulation.
Ovulation occurs when an ovary releases an egg that can be fertilised by sperm. For natural pregnancy to occur, ovulation generally needs to take place. When PMOS causes ovulation to become irregular or absent, there may be fewer opportunities for conception.
Women with PMOS may experience:
- Irregular menstrual periods
- Infrequent ovulation
- Absent periods
- Increased androgen levels
- Acne
- Increased facial or body hair
- Difficulty predicting the fertile window
- Metabolic changes, including problems with blood sugar regulation
However, PMOS does not affect every woman in exactly the same way.
A woman with PMOS may have regular periods and ovulate normally, while another woman with PMOS may ovulate only occasionally. This is one reason why fertility assessment should be individualised.
It is also important to understand that polycystic-looking ovaries do not automatically mean that a woman has PMOS. An ultrasound finding alone is not enough to diagnose PMOS. A healthcare professional considers symptoms, medical history, hormone findings and other diagnostic criteria.
How PMOS can affect fertility
PMOS-related factor | Possible effect on fertility |
Irregular ovulation | Fewer opportunities for natural conception |
Absent ovulation | An egg may not be released for fertilisation |
Hormonal changes | May interfere with normal follicle development |
Increased androgen levels | May contribute to ovulatory dysfunction |
Metabolic abnormalities | Can influence reproductive and overall health |
Irregular periods | Can make the fertile window difficult to predict |
Therefore, PMOS and fertility are closely connected, but PMOS should not automatically be interpreted as infertility.
Can PMOS Make It Difficult to Get Pregnant?
Yes, PMOS can make it more difficult to get pregnant, especially when PMOS causes irregular or absent ovulation.
For natural conception, an egg needs to be released from the ovary and be available for fertilisation. If PMOS causes ovulation to occur less frequently, the number of opportunities for pregnancy may be reduced.
However, PMOS is not the same as permanent infertility.
The current international PMOS guidance specifically reassures women that pregnancy can often be achieved either naturally or with fertility assistance.
For some women, PMOS may be the main reason pregnancy is taking longer than expected. For others, PMOS may exist alongside another fertility factor.
For example, difficulty conceiving may also be associated with:
- Age-related changes in fertility
- Fallopian tube problems
- Uterine abnormalities
- Reduced ovarian reserve
- Endometriosis
- Male-factor infertility
- Other hormonal conditions
This is why a fertility assessment should consider both partners, rather than assuming PMOS is automatically the only cause of delayed conception.
A fertility specialist may evaluate ovulation, reproductive hormones, ovarian reserve, the uterus and fallopian tubes where appropriate, as well as sperm quality.
The aim is to identify the actual reason pregnancy has not occurred and then choose the most appropriate treatment.
Can You Get Pregnant Naturally with PMOS?
Yes, you can get pregnant naturally with PMOS.
Having PMOS does not automatically mean that fertility treatment or IVF will be necessary. Some women with PMOS ovulate regularly, while others ovulate less frequently but still release an egg occasionally.
Because ovulation can be unpredictable with PMOS, women with irregular periods should not assume that they cannot become pregnant.
If pregnancy is desired, understanding whether ovulation is occurring can be useful. A healthcare professional can assess menstrual patterns and other factors that may help determine the most appropriate approach.
The possibility of natural pregnancy with PMOS depends on several factors.
Factor | Why it matters for natural pregnancy |
Ovulation | Pregnancy generally requires release of an egg |
Age | Fertility naturally changes with age |
Fallopian tube health | Healthy tubes are important for natural fertilisation |
Sperm quality | Male-factor fertility can affect conception |
Uterine health | The uterus needs to support implantation |
Metabolic health | Metabolic factors may affect reproductive health |
Duration of trying | Persistent difficulty may indicate the need for assessment |
Women with PMOS who are planning pregnancy should also consider preconception care. Current PMOS guidance recommends addressing reproductive and metabolic health before pregnancy, including blood pressure, nutritional status, folate supplementation, exercise, sleep and other relevant health factors.
Importantly, healthy lifestyle management should be personalised. PMOS care should not be based on extreme dieting, excessive exercise or unrealistic expectations about body weight.
Does PMOS Increase the Risk of Pregnancy Complications?
Yes, PMOS can increase the risk of certain pregnancy complications, although having PMOS does not mean that complications are guaranteed.
The current evidence-based PMOS guidance considers women with PMOS to have higher-risk pregnancies and recommends that healthcare professionals identify PMOS during antenatal care and provide appropriate monitoring and support.
Pregnancy complications associated with PMOS can include problems involving blood sugar and blood pressure.
Women with PMOS have an increased risk of hyperglycaemia and hypertensive disorders during pregnancy. The current guidance recommends considering an oral glucose tolerance test when planning pregnancy or seeking fertility treatment, and again during pregnancy according to clinical guidance.
This does not mean that a woman with PMOS will necessarily develop gestational diabetes, high blood pressure or another complication.
Instead, knowing that PMOS may increase certain risks allows healthcare professionals to provide appropriate monitoring.
Why preconception care matters with PMOS
Women with PMOS who are planning pregnancy may benefit from a preconception consultation. During this consultation, a healthcare professional can review:
- Menstrual and ovulation patterns
- Blood pressure
- Blood sugar and metabolic health
- Current medications
- Nutritional status
- Folic acid supplementation
- Other medical conditions
- Previous pregnancy history
- Fertility history
Preparing for pregnancy before conception can help identify potential health concerns early.
Once pregnancy occurs, appropriate antenatal care remains important. Women with PMOS can have healthy pregnancies, but their healthcare team may recommend additional monitoring based on their individual risk factors.
What Are the Treatment Options for PMOS-Related Infertility?
Treatment for PMOS-related infertility depends on the woman’s age, ovulation pattern, duration of infertility and whether other fertility factors are present.
There is no single fertility treatment that is right for every woman with PMOS.
The first step is usually a fertility assessment to establish why conception has not occurred.
Ovulation Induction
When PMOS-related infertility is caused primarily by irregular or absent ovulation, medication can be used to help induce ovulation.
Current evidence-based PMOS guidance recommends letrozole as the preferred first-line pharmacological treatment for ovulation induction in women with PMOS and anovulatory infertility when there are no other infertility factors.
Ovulation induction should be prescribed and monitored by a qualified healthcare professional.
Monitoring may be required to assess ovarian response and reduce the risk of complications such as multiple pregnancy.
Metformin
Metformin may have a role in selected women with PMOS, particularly in relation to metabolic features. It may also be considered for anovulatory infertility in some circumstances, although the current guidance notes that there are more effective ovulation agents.
Metformin should therefore not be viewed as an automatic fertility treatment for every woman with PMOS.
Intrauterine Insemination (IUI)
IUI, or intrauterine insemination, may be considered for selected women with PMOS.
During IUI, prepared sperm is placed directly into the uterus around the time of ovulation. IUI may be considered when ovulation induction has not resulted in pregnancy or when there are other appropriate indications.
Whether IUI is appropriate depends on factors such as sperm quality, fallopian tube function, age and previous fertility treatment.
In Vitro Fertilisation
IVF may be an option for women with PMOS when other fertility treatments have not worked or when there is another indication for IVF.
IVF involves ovarian stimulation, egg retrieval, fertilisation in a laboratory and transfer of an embryo into the uterus.
Women with PMOS undergoing IVF require careful monitoring because PMOS can be associated with an increased risk of ovarian hyperstimulation syndrome. Current guidance recommends counselling women about this risk and considering strategies that can reduce it.
For women with PMOS undergoing IVF, treatment should therefore be carefully individualised rather than using the same stimulation approach for every patient.
Fertility Assessment before Treatment
Before starting fertility treatment, a specialist may evaluate:
- Ovulation
- Ovarian reserve
- The uterus
- The fallopian tubes
- Sperm quality
- Relevant hormonal factors
- Metabolic health
- Previous fertility treatment
This helps ensure that treatment is directed at the actual cause of infertility.
Frequently Asked Questions About PMOS and Fertility
Can PMOS cause infertility?
PMOS can contribute to infertility, particularly when PMOS causes irregular or absent ovulation. However, PMOS does not automatically mean permanent infertility.
Many women with PMOS can become pregnant naturally, while others may need assistance with ovulation or other fertility treatment. Current PMOS guidance specifically states that pregnancy can often be achieved naturally or with assistance.
If pregnancy is taking longer than expected, a fertility assessment can determine whether PMOS is affecting ovulation and whether another fertility factor is present.
Can I get pregnant with PMOS and irregular periods?
Yes. Women with PMOS and irregular periods can become pregnant. Irregular periods can be a sign that ovulation is occurring irregularly, but they do not necessarily mean that ovulation never occurs. Some women with PMOS continue to ovulate occasionally and may conceive naturally.
If you are trying to conceive, a fertility specialist can assess your ovulation pattern and discuss whether treatment is necessary.
Does PMOS mean I will need IVF?
No. PMOS does not automatically mean that IVF is required.
Depending on the cause of infertility, treatment may begin with ovulation induction. IUI may be appropriate in selected circumstances, while IVF may be considered when other treatments have failed or when there is an independent indication for IVF.
The appropriate treatment depends on the individual fertility assessment.
Can PMOS affect pregnancy after I become pregnant?
Yes. PMOS can be associated with an increased risk of certain pregnancy complications, particularly metabolic and hypertensive complications.
However, having PMOS does not mean that a pregnancy will necessarily be complicated. Appropriate preconception care and antenatal monitoring can help healthcare professionals identify and manage potential risks.
Women with PMOS should inform their healthcare provider about their condition when planning pregnancy or as soon as pregnancy is confirmed.
What is the best fertility treatment for PMOS?
There is no single best fertility treatment for every woman with PMOS.
When PMOS causes anovulatory infertility without other infertility factors, current evidence-based guidance recommends letrozole as the preferred first-line medication for ovulation induction.
Other treatments, including IUI and IVF, may be considered depending on the woman’s fertility assessment and whether other reproductive factors are present.
When should I see a fertility specialist if I have PMOS?
You can speak with a fertility specialist if you have PMOS and are concerned about your ability to conceive, especially if your periods are very irregular or absent or if you have been trying to become pregnant without success.
A fertility consultation can establish whether you are ovulating and whether there are other factors affecting conception.
Early assessment can also help you understand your options rather than assuming that PMOS alone is responsible for delayed pregnancy.
PMOS and Fertility: What Should You Remember?
The most important thing to remember is that PMOS can affect fertility, but PMOS does not mean that you cannot become pregnant.
PMOS most commonly affects fertility through irregular or absent ovulation. However, the severity and presentation of PMOS vary between women.
Some women with PMOS become pregnant naturally. Others may require ovulation induction, IUI or IVF.
PMOS can also be associated with an increased risk of certain pregnancy complications, which is why preconception planning and appropriate antenatal monitoring are important.
The right approach is therefore not to assume that PMOS equals infertility. Instead, women should receive an individualised assessment that considers ovulation, age, ovarian function, fallopian tubes, uterine health, sperm quality and relevant metabolic factors.
Conclusion: Can PMOS Affect Pregnancy?
Yes, PMOS can affect both fertility and pregnancy, but PMOS does not mean that pregnancy is impossible. The main fertility effect of PMOS is irregular or absent ovulation, which can make natural conception more difficult for some women.
However, many women with PMOS become pregnant naturally, while others achieve pregnancy with appropriate fertility treatment. Depending on the individual’s circumstances, treatment may include ovulation induction, IUI or IVF.
PMOS can also increase the risk of certain pregnancy complications, making preconception care and appropriate antenatal monitoring particularly important.
If you have PMOS and are trying to conceive, the best next step is to understand how PMOS is affecting your individual fertility rather than assuming that you are infertile.
Fertility Care at Nectar Gyn & Fertility Centre
At Nectar Gyn & Fertility Centre, we understand that every fertility journey is different. If you have PMOS and are experiencing difficulty conceiving, our fertility team can help assess your reproductive health and discuss appropriate fertility options based on your individual circumstances.
Our fertility services include fertility assessment, ovulation management, IUI, IVF and comprehensive reproductive care.
If you are concerned about PMOS and fertility, do not assume that pregnancy is out of reach. Professional assessment can help you understand your options and take the next step with confidence.
Contact Nectar Gyn & Fertility Centre: 0112 792 444 / 0118 141 000
