Understanding Female Infertility: Causes, Diagnosis and Treatment

Infertility is one of the most common reproductive health problems that women are encountering at present, and the number of cases is on the rise. Globally, it affects about one in six people, and rates have increased considerably over the last three decades. Even though it is a very common condition, many women spend months, in some cases years, without having a clear idea of what is going on or what actions they can take. There are a variety of causes of female infertility, including hormonal imbalances and ovulation disorders as well as structural issues such as endometriosis and blocked tubes. The good news is that appropriate testing can identify and treat most causes. This guide provides a complete overview of the causes of female infertility, which symptoms to watch for, how diagnosis is carried out, and the treatment options available today, including the latest advances in reproductive medicine.

What Is Female Infertility? 

Female infertility is defined as being unable to get pregnant after having regular unprotected sex for 12 months or after 6 months if a woman is over the age of 35. The most frequent causes are:

• Ovulation disorders, which involve either irregular or absent ovulation, are the cause of about 25% of cases of female infertility, and PCOS is the most frequent underlying reason.
• Tubal disease or blockage: occurs when the fallopian tubes are blocked or damaged, preventing sperm from reaching the egg. Pelvic inflammatory disease and endometriosis are common causes.
• Abnormalities of the uterus or cervix, such as fibroids, polyps, or a deformed uterus, can affect implantation or the progress of a pregnancy.
• Premature ovarian insufficiency (POI) means that the ovaries stop functioning normally before a woman reaches the age of 40, and it affects about 1% of women.
• Infertility that cannot be explained, since about 15 to 20% of cases yield no identifiable cause even after a comprehensive investigation is being increasingly given explanations in previously unexplained cases due to the growing use of diagnostic tools such as testing for sperm DNA fragmentation and ERA assessment.

Types of Female Infertility: Unexplained, Structural, Hormonal, Etc.

There are several types of female infertility, each with its own causes and treatment options. As an overview:

Ovulatory infertility is the most common type. If your hormones are disrupted, your ovaries may not release eggs regularly. The good news is that this type often responds well to medical treatments such as letrozole or gonadotropins.

Structural infertility means there are physical issues, such as blocked fallopian tubes, fibroids, endometriosis, or differences in your uterus. Doctors usually detect these using tests such as ultrasound, HSG, or laparoscopy. Depending on what is found, you may be offered surgery or IVF to help you conceive.

Hormonal infertility happens when the signals between your brain and ovaries are disrupted, which can affect ovulation. Targeted medications can often help. If your case is more severe, IVF may be recommended.

Infertility associated with advancing age is due to a decrease in both the number and quality of eggs, with this decline becoming more pronounced after the age of 35. There is a sharp drop in AMH levels, especially after the age of 36, which underlines the need for early fertility assessment and treatment. For women who have a substantially reduced ovarian reserve, using donor eggs may be the most effective solution.

Unexplained infertility means that all your standard tests are normal, but pregnancy has not happened yet. Newer tests, such as sperm DNA fragmentation and endometrial receptivity assessment (ERA), are starting to provide more answers for people in this situation.

Causes of Female Infertility

Ovulation Disorders

PCOS is a hormonal imbalance that disrupts the growth and release of eggs; it is the leading cause of anovulatory infertility in women globally.

Premature ovarian failure (POI) refers to loss of normal ovarian function before 40, leading to irregular or absent periods and significantly reduced fertility.

Thyroid dysfunction, both overactive and underactive thyroid, can disrupt the menstrual cycle and ovulation. Correcting thyroid levels often meaningfully improves fertility.

Excessive exercise and significant weight changes, both underweight and overweight states, can suppress ovulation through hormonal disruption.

Certain medications, including chemotherapy agents, antipsychotics, and corticosteroids, can interfere with ovulation. Always discuss fertility implications with your doctor before starting any new treatment.

Anatomical Problems

Blocked fallopian tubes caused by pelvic inflammatory disease, endometriosis, or previous infection prevent sperm from reaching the egg and the fertilised egg from reaching the uterus.

Uterine fibroids: benign tumours in the uterus that can interfere with implantation. Large or submucosal fibroids may need surgical removal to restore fertility.

Endometriosis: uterine tissue growing outside the uterus, causing inflammation, adhesions, and damage to the fallopian tubes and ovaries. Treatment includes medication, hormone therapy, or laparoscopic surgery depending on severity.

Congenital abnormalities, including septate uterus, double uterus, or developmental problems with the cervix or ovaries. Certain abnormalities can be corrected surgically.

Diagnosing Female Infertility: Tests and Procedures

When trying to determine the cause of infertility, your doctor will order several tests to evaluate different aspects of female infertility health. These tests help identify any problems preventing pregnancy so appropriate treatment can be determined.

Hormone Testing 

If you are assessing your fertility, a comprehensive hormone panel is your starting point.

• AMH is the most stable marker of ovarian reserve and can be tested on any cycle day. AMH estimates ovarian reserve, helps determine stimulation dosing, and predicts response to stimulation. It is a good marker of oocyte quantity but does not reflect oocyte health or chances for pregnancy.
• FSH and oestradiol are usually checked between days 2 and 5 of your cycle. If your FSH is high and your oestradiol is low, this may suggest your ovarian reserve is lower than expected.
• Your LH is also measured between days 2 and 5. If your LH to FSH ratio is high, this can be a sign of polycystic ovary syndrome (PCOS).
• Progesterone is usually checked around day 21 of your cycle. This helps confirm if you have ovulated.
• Your prolactin level is also important. If it is high, it can stop you from ovulating, even if your other hormones look normal.
• TSH checks how well your thyroid is working. Thyroid problems can look a lot like other hormone issues and are often missed.

Ovulation Testing

Basal body temperature charting, ovulation predictor kits, and mid-luteal progesterone blood tests together confirm whether and when ovulation is occurring. Irregular or absent ovulation is one of the most treatable causes of female infertility.

Imaging

Transvaginal ultrasound assesses the ovaries, uterus, and antral follicle count. Hysterosalpingography (HSG) uses contrast dye under X-ray to confirm whether the fallopian tubes are open and the uterine cavity is normal. Sonohysterography injects fluid into the uterus to better visualise the uterine lining.

Laparoscopy

A minimally invasive surgical procedure that directly examines the outside of the uterus, fallopian tubes, and ovaries. It is the gold standard for diagnosing endometriosis and pelvic adhesions — and corrective procedures can often be performed at the same time.

Endometrial Biopsy

A portion of the uterine lining is taken to assess its suitability for implantation. The ERA (Endometrial Receptivity Analysis) test is an emerging method that examines gene expression in the endometrium to establish your personal implantation window, which is especially useful in cases of repeated implantation failure.

Treatment Options for Female Infertility

Fertility Medications and Drugs for Female Infertility

Your treatment will depend on the underlying cause of your infertility. No single first-line medication works for everyone.

• Letrozole is an aromatase inhibitor and is now the preferred first choice for helping you ovulate, especially if you have PCOS. Research shows that letrozole leads to higher ovulation and live birth rates, and lowers the risk of multiple pregnancies compared to clomiphene citrate.
• Clomiphene remains an option if you cannot use letrozole or if it is unavailable. It helps by blocking oestrogen receptors in your brain, which stimulates your ovaries to develop follicles. However, for most women, it is no longer the first choice for ovulation problems.
• Gonadotrophins are injectable medications, such as Follistim, Gonal-F, and Menopur, that contain FSH and LH. These medicines directly stimulate your ovaries to develop several follicles. You may need them if oral medications have not worked or as part of IVF. They do carry a higher risk of multiple pregnancies and ovarian hyperstimulation syndrome, especially if you have PCOS or high AMH levels.
• GnRH agonists and antagonists are used during IVF to help control your ovulation and prevent it from happening too early. If you have PCOS, your doctor will likely recommend a GnRH antagonist protocol, as it lowers your risk of ovarian hyperstimulation syndrome compared to older protocols.
• When your follicles are ready, you will get a trigger injection to help your eggs mature. The usual trigger is hCG. If you are at higher risk for ovarian hyperstimulation syndrome, your doctor may use a GnRH agonist trigger instead. Using this trigger, especially if all embryos are frozen, can greatly lower your risk of severe OHSS.
• Metformin is an insulin sensitiser often used if you have PCOS. It can help balance your hormones and support ovulation, especially when combined with letrozole or gonadotrophins.
• You may need progesterone supplementation after IUI or embryo transfer. This helps support implantation and the early stages of pregnancy.
• Bromocriptine and cabergoline are dopamine agonists. Your doctor may use them to lower high prolactin levels and help restore ovulation. In some high-risk cases, they can also help reduce the risk of ovarian hyperstimulation syndrome after egg retrieval.

Surgery for Female Infertility: When It’s Needed and What’s Involved

Diagnostic Surgery

If standard tests have not found the cause of your infertility, your doctor may suggest laparoscopy and hysteroscopy. These are minimally invasive procedures that let your doctor look closely at both the outside and inside of your reproductive organs. When performed by an experienced surgeon, these procedures are low risk.

Corrective Surgery

If your doctor finds a problem, you may be offered one of these corrective procedures:

• Removing endometrial implants or adhesions can help restore your fertility if the blockage or damage is small.
• Myomectomy removes fibroids from your uterus but keeps your uterus in place.
• Septum resection removes a wall inside your uterus that may be stopping you from getting pregnant or causing miscarriages.
• Tubal surgery can repair or unblock your fallopian tubes if the damage is small. If the damage is more severe, IVF may be a better option for you.

Assisted Reproductive Technology (ART)

If other treatments have not helped you achieve pregnancy, ART may offer you the most effective next step.

• IUI involves placing washed sperm directly into your uterus around the time you ovulate. Success rates are about 10-15% per cycle. This option is usually best if you have mild ovulatory disorders or unexplained infertility.
• With IVF, eggs are collected from your ovaries, fertilised in a laboratory, and then the embryos are placed into your uterus. Success rates depend a lot on your age and personal situation, so it is important to discuss what these numbers mean for you.
• IVF with ICSI means a single sperm is injected into each egg. This is usually recommended if there is male factor infertility or if standard fertilisation has not worked before.
• Advanced ART Techniques: If you are considering IVF, you have access to several advanced options that may improve your chances. Preimplantation genetic testing (PGT-A) checks your embryos for chromosomal abnormalities before transfer. This can lower your risk of miscarriage and increase the chance of implantation, especially if you are over 35 or have had repeated pregnancy loss. Assisted hatching involves creating a small opening in the embryo’s outer shell to facilitate implantation. This is often recommended if you have had unsuccessful IVF cycles in the past. EmbryoGlue is a special transfer medium with hyaluronic acid that helps your embryo stick to the uterine lining. Studies show it can improve implantation rates. If you are at high risk for ovarian hyperstimulation syndrome (OHSS), especially if you have PCOS, your doctor may suggest a freeze-all approach. This means freezing all embryos and transferring them in a later cycle, which can lower your risk without reducing your chances of success.

Lifestyle Changes

• • Lifestyle changes can support your fertility, especially if you can change something. Think of these changes as a way to work alongside your medical treatment, not replace it.
  • Keeping a healthy weight helps your hormones and ovulation stay balanced. If you have PCOS, even a small amount of weight loss can help your periods become regular and may improve your chances of getting pregnant.
  • Try to reduce your stress. Ongoing stress can affect the hormones that control your fertility. Mindfulness, cognitive behavioural therapy, and structured support have the best evidence for helping you feel better during fertility treatment.
  • Limiting alcohol, caffeine, and smoking can help your egg quality and fertility. If you stop smoking, you may see real improvements in just three months.
  • Some nutrients and supplements can support your fertility. Folic acid, vitamin D, omega-3 fatty acids, and CoQ10 have the best evidence. Talk to your doctor before you start any new supplements.

Frequently Asked Questions

Conclusion

Female infertility is one of the most researched and treatable areas in reproductive medicine. Today, you have more options than ever before. To get the best results, focus on three things: understand what is causing your fertility challenges, get the right investigations, and work with a specialist who looks at your whole clinical picture. No matter your situation, there is almost always a clear path forward. The sooner you start the conversation, the more choices you will have. Fertility medicine is moving quickly. Each year brings new techniques, better protocols, and more personalised treatments. The options available to you now are greater than ever.

Reference

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Anna Haotanto

Anna Haotanto is the Founder of Zora Health and a passionate advocate for women’s empowerment. Anna’s personal experiences with egg-freezing, PCOS, perimenopause and the challenges of fertility have fueled her mission to provide high-quality information, financing, and support to help women and couples navigate their fertility journeys with confidence. She is also recognised for her achievements in finance, entrepreneurship, and women’s empowerment, and has been featured in various media outlets. You can also follow her on Linkedin or Instagram.