Common Causes of Female Infertility Explained
Medically Reviewed by Dr. Jaideep Malhotra | Director ART, Rainbow IVF, Agra | MBBS, MD, FRCOG (UK) Reviewed/Updated: September 9, 2026
Struggling to conceive is stressful, and it’s natural to want quick answers. The good news is that difficulty getting pregnant does not automatically mean something is seriously wrong, and it certainly doesn’t mean IVF is the only path forward. There are many common causes of female infertility, ranging from ovulation irregularities to structural issues with the fallopian tubes, uterus or ovaries, hormonal imbalances, and age-related changes in egg quantity and quality. Often, more than one factor is involved.
Rather than relying on symptoms or self-diagnosis from the internet, the most reliable way to understand what’s happening is a proper fertility evaluation. It’s also worth remembering that infertility is not exclusively a “female problem” — male-factor issues contribute to roughly half of all cases, so evaluating both partners together gives the clearest picture.
If you and your partner have been trying to conceive without success, an infertility consultation is a good place to start, so you can understand which fertility tests are actually appropriate for your situation.
What Is Female Infertility?
Female infertility is generally defined as the inability to become pregnant after 12 months of regular, unprotected intercourse (or after 6 months if the woman is over 35). It’s classified as a medical condition rather than simply “bad luck” or a failure on anyone’s part, because it usually has an identifiable biological cause — even when that cause takes some investigating to find.
Age matters because egg quantity and quality decline over time, and a woman’s full medical and menstrual history often holds important clues. Because sperm quality, count and function play a role in roughly half of couples facing infertility, a thorough workup typically looks at both partners rather than assuming the issue lies with the woman alone.
What Are the Common Causes of Female Infertility?
Female infertility can stem from problems with ovulation, the fallopian tubes, the uterus, the ovaries, hormone regulation, or age — sometimes in combination. The most common causes include:
- Ovulation disorders
- Polycystic ovary syndrome (PCOS)
- Endometriosis
- Blocked or damaged fallopian tubes
- Diminished ovarian reserve and low AMH
- Age-related decline in fertility
- Uterine fibroids and polyps
- Hormonal and endocrine disorders
- Previous pelvic infection or surgery
- Premature ovarian insufficiency
- Lifestyle and environmental factors
- Unexplained infertility
Each is explained in more detail below.
Ovulation Disorders
Regular ovulation is essential for conception, since it’s the release of a mature egg that makes pregnancy possible each cycle. When ovulation is irregular or absent, the window for conception shrinks or disappears altogether.
Common contributors to ovulation disorders include:
- PCOS
- Thyroid disorders
- Hyperprolactinemia (elevated prolactin)
- Significant weight gain or loss
- Certain medications
- Premature ovarian insufficiency
Irregular periods are often a useful clue that ovulation may not be happening consistently. However, having regular cycles doesn’t guarantee that ovulation — or fertility overall — is normal, which is why testing is more reliable than tracking cycle length alone.
PCOS and Female Infertility
Polycystic ovary syndrome (PCOS) is a common hormonal condition in which elevated androgen levels and insulin resistance disrupt the normal hormonal signalling needed for regular ovulation. This can lead to irregular or absent periods and, in turn, reduced chances of natural conception.
Having PCOS does not mean pregnancy is impossible. Many women with PCOS conceive naturally once ovulation is restored, and when medical support is needed, options range from lifestyle adjustments and ovulation-inducing medication to IUI or IVF depending on the individual case. For a deeper look at how PCOS affects fertility and when treatment may help, see our guide on PCOS and pregnancy.
Endometriosis
Endometriosis occurs when tissue similar to the uterine lining grows outside the uterus, commonly on the ovaries, fallopian tubes or pelvic lining. It can affect fertility through inflammation, scar tissue and adhesions that distort pelvic anatomy, and in some cases through its impact on ovarian function and egg quality.
Not every woman with endometriosis experiences infertility — severity varies enormously from mild, incidental findings to more extensive disease that affects the reproductive organs directly. Our detailed guide on endometriosis and fertility covers staging, treatment options and what to expect if you’re trying to conceive with this condition.
Blocked or Damaged Fallopian Tubes
The fallopian tubes are where the egg and sperm typically meet, and where fertilisation occurs before the embryo travels to the uterus. When one or both tubes are blocked or damaged, sperm and egg may never come into contact, making natural conception difficult or impossible.
Common causes of tubal damage include:
- Pelvic inflammatory disease
- Previous pelvic infections
- Prior pelvic or abdominal surgery
- Endometriosis
When the tubes are significantly blocked, IVF is often introduced as an option because it bypasses the tubes entirely — the egg and sperm are combined in a laboratory rather than inside the body. That said, IVF isn’t the automatic answer for every infertility diagnosis; it’s one option among several, and its suitability depends on the full clinical picture.
Low AMH and Diminished Ovarian Reserve
Ovarian reserve refers to the number of eggs remaining in the ovaries, and Anti-Müllerian Hormone (AMH) is a blood marker commonly used to estimate it. A lower-than-expected AMH can suggest a reduced egg supply for a given age.
It’s important not to interpret AMH in isolation. AMH reflects egg quantity, not quality, and a low result does not mean pregnancy is impossible — many women with low AMH conceive naturally or with treatment, particularly when they are still under 35. Age, antral follicle count (AFC) and overall fertility history all need to be considered together for an accurate picture. Our detailed guide on low AMH and IVF explains ovarian reserve, what different AMH levels mean, and the treatment approaches used for women with diminished ovarian reserve.
Age-Related Changes in Female Fertility
Fertility generally declines with age, primarily because both the number and quality of eggs decrease over time. This also raises the likelihood of chromosomal abnormalities in eggs, which is linked to a higher risk of miscarriage as women get older.
This is a factual, gradual process rather than a sudden cliff at any particular birthday, but the decline does accelerate in the mid-to-late 30s and further after 40. Because of this, women who are older and experiencing difficulty conceiving may benefit from seeking a fertility evaluation sooner rather than waiting the full 12 months typically advised for younger women.
Uterine Fibroids and Polyps
Structural changes inside or around the uterus can sometimes interfere with conception or with an embryo’s ability to implant successfully. These include:
- Fibroids (benign growths in the uterine muscle)
- Endometrial polyps
- Congenital uterine abnormalities
- Adhesions from previous surgery or infection
Not every fibroid or polyp causes infertility — many are small, asymptomatic and have no meaningful effect on fertility. Whether treatment is recommended depends on the size, number, location (particularly whether they distort the uterine cavity) and overall clinical significance.
Hormonal and Endocrine Problems
Beyond PCOS, several other hormonal and endocrine conditions can interfere with reproductive function, including:
- Thyroid disorders (both underactive and overactive)
- Elevated prolactin levels
- Hypothalamic or pituitary disorders affecting hormone signalling
- Other hormonal disturbances that disrupt ovulation
Blood tests are often the first step in identifying these causes, since many hormonal imbalances are treatable once correctly diagnosed.
Previous Pelvic Infection or Surgery
A history of pelvic infection or prior surgery can sometimes leave lasting effects on fertility, including scarring of the fallopian tubes, changes to pelvic anatomy, reduced ovarian function, or adhesions between pelvic structures. This is more likely with infections that went untreated for some time or with more extensive surgical procedures.
It’s worth being cautious about broad assumptions here — not every past infection or surgery causes infertility, and many women with this history conceive without difficulty. A fertility evaluation can clarify whether any lasting impact is actually present.
Premature Ovarian Insufficiency
Premature ovarian insufficiency (POI) refers to reduced ovarian function occurring at an unusually young age, typically before 40. It can cause irregular or absent periods and may make conception more difficult.
POI is different from the normal, gradual age-related decline in fertility — it happens earlier and is often linked to genetic, autoimmune or medical causes (such as prior chemotherapy). Because timing matters for fertility options, specialist evaluation is particularly important if POI is suspected.
Lifestyle and Environmental Factors
Certain lifestyle and environmental factors may influence reproductive health, including:
- Smoking
- Excessive alcohol consumption
- Being significantly underweight or living with obesity
- Poor sleep quality
- Chronic, high levels of stress
- Exposure to certain environmental toxins
Healthy habits can meaningfully support reproductive health, but it’s important to be realistic: lifestyle changes alone cannot correct structural issues such as blocked fallopian tubes or resolve significant fertility disorders. They work best as a complement to appropriate medical care, not a replacement for it. Our article on lifestyle changes to support fertility goes into more detail on what actually helps.
Unexplained Infertility
Sometimes, standard fertility testing doesn’t identify a clear cause, even after ovulation, tubal patency, uterine structure and semen quality have all been assessed. This is called unexplained infertility.
“Unexplained” does not mean imaginary, and it doesn’t mean pregnancy is impossible. It simply means the standard tests haven’t pinpointed a specific factor. Further evaluation and individualised treatment can still be considered, with the right approach depending on age, how long you’ve been trying, and the results of prior testing — which is where a specialist consultation becomes particularly valuable.
What Are the Signs of Female Infertility?
Infertility itself often has no obvious symptoms — many women with fertility challenges feel completely well and have regular cycles. That said, some signs can be useful clues that warrant further evaluation:
- Irregular periods
- Absent periods
- Very painful periods
- Symptoms associated with endometriosis (such as pain during intercourse or bowel movements)
- History of pelvic infection
- Repeated pregnancy loss
- Symptoms suggesting hormonal imbalance (such as unusual hair growth, acne or weight changes)
- Difficulty conceiving despite regular, well-timed attempts
It’s important not to assume that the absence of these signs means fertility is normal — many underlying causes, including tubal issues and unexplained infertility, produce no symptoms at all.
When Should You See a Fertility Specialist?
As a general guide, it may be appropriate to seek evaluation when:
- Pregnancy hasn’t occurred after 12 months of trying (or 6 months if you’re 35 or older)
- Your periods are irregular or absent
- You have a known diagnosis of PCOS or endometriosis
- You have a history of pelvic surgery or infection
- There are concerns about ovarian reserve
- You’ve experienced recurrent miscarriages
- Either partner has a known fertility issue
If any of this sounds familiar, an individualised infertility consultation can help determine which tests are actually appropriate for you, and whether treatment is necessary at all.
How Is Female Infertility Diagnosed?
A fertility evaluation typically looks at several areas together, rather than relying on a single test.
| Area of assessment |
What it may involve |
| Medical & reproductive history |
Menstrual history, pregnancy history, prior surgeries, medical conditions, previous fertility treatments |
| Ovulation |
Cycle tracking, hormonal blood tests, ultrasound where appropriate |
| Ovarian reserve |
AMH, antral follicle count (AFC), other clinical factors |
| Uterus |
Ultrasound, hysteroscopy where indicated |
| Fallopian tubes |
Tests to confirm whether the tubes are open |
| Partner evaluation |
Semen analysis, since male factors contribute to roughly half of infertility cases |
Our IVF diagnostics service covers this full range of testing, and our guide on how fertility specialists diagnose the cause of infertility walks through what to expect at each stage.
Treatment Options for Female Infertility
Treatment depends entirely on the underlying cause identified during evaluation — there’s no one-size-fits-all approach. Options include:
- Lifestyle and medical management of underlying conditions
- Ovulation-induction medication
- Treatment for hormonal conditions such as thyroid disorders
- Surgery in selected cases (for example, to remove certain fibroids or treat endometriosis)
- Intrauterine insemination (IUI)
- In vitro fertilisation (IVF)
- ICSI, when male-factor infertility is also present
- Fertility preservation in selected circumstances
When Is IUI Considered?
IUI involves placing specially prepared sperm directly into the uterus around the time of ovulation, shortening the distance sperm needs to travel. It’s often considered for mild male-factor infertility, unexplained infertility, or ovulation issues where medication has restored regular ovulation. It’s generally less suitable when the fallopian tubes are blocked. Our comparison guide, IVF vs IUI, covers suitability and success rates for each in more detail.
When May IVF Be Recommended?
IVF may be considered for a range of situations, including blocked fallopian tubes, some cases of endometriosis, certain ovulation-related infertility, reduced ovarian reserve (depending on the individual case), previous unsuccessful fertility treatments, some cases of unexplained infertility, and additional male-factor infertility. IVF is not the universal “best” or “only” treatment — it’s one option that fits certain clinical pictures better than others. Our complete guide to IVF treatment explains the full process and who it tends to suit.
Can Female Infertility Be Prevented?
Not all causes of infertility are preventable — genetic factors and age-related decline, for instance, aren’t within anyone’s control. That said, some potentially modifiable factors may help protect reproductive health over time:
- Avoiding smoking
- Maintaining a healthy weight
- Managing chronic health conditions such as diabetes or thyroid disorders
- Taking steps to prevent sexually transmitted infections
- Seeking prompt medical care for menstrual abnormalities rather than waiting them out
- Discussing fertility preservation with a specialist if it’s medically relevant to your situation
These steps can support overall reproductive health, but they can’t guarantee against age-related decline or genetic causes of infertility.
Frequently Asked Questions
What are the most common causes of female infertility?
The most common causes include ovulation disorders (including PCOS), endometriosis, blocked or damaged fallopian tubes, diminished ovarian reserve, age-related decline, and uterine conditions like fibroids or polyps. Often, more than one factor contributes, and in some cases no clear cause is found (unexplained infertility).
Can PCOS cause infertility in women?
Yes, PCOS can disrupt regular ovulation, making conception harder. However, PCOS doesn’t mean pregnancy is impossible — many women conceive naturally or with support such as ovulation-inducing medication, IUI or IVF, depending on their individual situation.
Can blocked fallopian tubes cause infertility?
Yes. If both tubes are blocked, sperm and egg typically cannot meet, which prevents natural conception. In these cases, IVF is often considered because it bypasses the fallopian tubes entirely.
Does low AMH mean a woman cannot get pregnant?
No. Low AMH indicates a reduced egg supply for a given age but doesn’t measure egg quality, and it doesn’t mean pregnancy is impossible. Many women with low AMH conceive naturally or with fertility treatment, particularly when evaluated alongside age and antral follicle count.
Can endometriosis affect fertility?
Endometriosis can affect fertility through inflammation, scarring and effects on the ovaries or fallopian tubes, but the impact varies widely. Some women with endometriosis conceive without difficulty, while others need medical support depending on the severity of their condition.
What tests are used to diagnose female infertility?
Diagnosis typically involves a review of medical and menstrual history, ovulation assessment, hormonal blood tests, ovarian reserve testing (AMH and antral follicle count), uterine imaging, tests to check whether the fallopian tubes are open, and semen analysis for the partner.
When should a woman see a fertility specialist?
Generally after 12 months of trying without success (or 6 months if 35 or older), or sooner if there are irregular periods, a known condition like PCOS or endometriosis, a history of pelvic surgery or infection, or recurrent miscarriage.
Is IVF necessary for every woman with infertility?
No. Treatment depends on the specific cause identified during evaluation. Many women are helped by simpler approaches such as ovulation induction, lifestyle changes, surgery or IUI, and IVF is reserved for situations where it’s genuinely the most appropriate option.
Final Takeaway
Female infertility can stem from many different causes, and identifying the specific factor — or combination of factors — at play matters far more than assuming any one treatment is automatically needed. With an accurate diagnosis, most causes of infertility can be addressed through an appropriately tailored plan, whether that’s lifestyle support, medication, surgery, or assisted reproductive technology.
Concerned About Difficulty Conceiving?
Understanding the cause is the first step toward choosing the right treatment. Speak with a fertility specialist at Rainbow IVF to discuss your medical history, fertility concerns and appropriate diagnostic options. Book a fertility consultation to get started.
