What PCOS Is and How It Affects Fertility
Polycystic ovary syndrome (PCOS) is a hormonal condition affecting the ovaries that impacts how the body produces and uses insulin, creates hormones, and develops eggs. Despite its name suggesting multiple cysts on the ovaries, PCOS isn’t actually about cysts—many women with PCOS don’t have cysts, and some women without PCOS do. The term is outdated, but it remains the standard name for this complex condition.
PCOS occurs when the ovaries produce higher-than-normal levels of male hormones (androgens), which interferes with the development and release of eggs. In a typical menstrual cycle, the pituitary gland sends hormonal signals that tell the ovaries to develop and release an egg. With PCOS, these signals don’t work as they should, so eggs develop but don’t get released, or they’re released inconsistently. This irregular ovulation is why PCOS is one of the most common causes of infertility in women.
The exact cause of PCOS isn’t fully understood, but research suggests it involves a combination of genetic and environmental factors. Insulin resistance plays a significant role—many women with PCOS have insulin resistance, meaning their bodies don’t respond properly to insulin. This causes the pancreas to produce more insulin, which signals the ovaries to produce more androgens, disrupting normal ovulation.
PCOS affects about 8-13% of women of reproductive age, making it very common. However, PCOS presents differently in different women. Some women have regular periods and don’t know they have PCOS until they’re trying to conceive. Others have irregular periods, excess hair growth, acne, or weight gain. Some women have all these symptoms. The variable presentation means PCOS can be hard to diagnose and easy to miss.
Despite PCOS being a fertility challenge, many women with PCOS do conceive, either naturally or with treatment. Understanding your diagnosis, knowing your treatment options, and working with a reproductive specialist gives you the best chance of conceiving successfully.
How PCOS Impacts Getting Pregnant
The primary way PCOS impacts fertility is through irregular or absent ovulation. If you’re not ovulating regularly, you have fewer chances each month to conceive because pregnancy requires a released egg to be fertilized. Irregular ovulation means irregular periods, which means you may not know when you’re fertile or whether you’re ovulating at all.
Insulin resistance, present in many women with PCOS, not only disrupts ovulation but also affects egg quality. Higher insulin levels can impair the development and maturation of eggs, meaning even if you do ovulate, the egg quality may be compromised. Egg quality becomes increasingly important as women age, and PCOS-related insulin resistance may worsen this age-related decline.
The higher androgen levels characteristic of PCOS can also interfere with the uterine environment needed for egg implantation. The uterus needs appropriate hormonal signals to prepare for implantation, and excess androgens can disrupt this. Additionally, women with PCOS have higher rates of miscarriage, possibly related to insulin resistance and inflammation.
PCOS also increases the risk of developing other fertility-related conditions. Women with PCOS have higher rates of endometriosis (though the relationship is complex and not fully understood). They also have higher rates of luteal phase defect, where the second half of the menstrual cycle isn’t long enough for pregnancy to establish.
However, PCOS doesn’t mean you can’t conceive. It means conception may take longer and may require treatment to achieve ovulation. Many women with PCOS do ovulate sometimes, even if irregularly, giving them natural conception opportunities. And for women who don’t ovulate naturally, multiple effective treatments can induce ovulation.
Understanding Your PCOS Diagnosis
If you’ve been diagnosed with PCOS, understanding the diagnostic criteria helps you know what aspects of your condition need treatment. PCOS is typically diagnosed using the Rotterdam criteria, which require two of three of the following: irregular or absent periods, clinical or biochemical signs of excess androgens, and polycystic ovaries on ultrasound.
The irregular periods criterion is straightforward—periods more than 35 days apart or fewer than eight periods per year indicate irregular ovulation. Some women with PCOS have amenorrhea (no periods) for months at a time.
Clinical signs of excess androgens include excess facial or body hair (hirsutism), acne, or male-pattern baldness. Biochemical signs include elevated testosterone or other androgen levels on blood tests. Not all women with PCOS have visible androgen excess, but blood tests often show elevated levels even without obvious symptoms.
Polycystic ovaries on ultrasound show either twelve or more follicles in each ovary or increased ovarian volume. However, some women with PCOS don’t have polycystic-appearing ovaries, and some women without PCOS do. Ultrasound findings alone aren’t diagnostic.
Beyond these diagnostic criteria, your doctor should assess for insulin resistance and metabolic issues. This includes fasting glucose, insulin levels, and glucose tolerance testing. Many women with PCOS have insulin resistance or prediabetes, which affects treatment decisions.
Your doctor should also screen for other conditions common in PCOS, including thyroid dysfunction, sleep apnea, and mental health conditions like depression and anxiety. PCOS increases risk for all of these, and addressing them improves fertility outcomes.
Lifestyle Changes That Impact PCOS and Fertility
Lifestyle modifications are the first-line treatment for PCOS, and research shows they significantly improve fertility outcomes. For many women, lifestyle changes alone are enough to restore ovulation and achieve pregnancy. For others, lifestyle changes improve the effectiveness of medical treatments.
Weight loss, even modest amounts, improves PCOS symptoms and fertility. Losing 5-10% of body weight has been shown to restore ovulation in many women with PCOS. Weight loss improves insulin resistance, reduces androgen levels, and improves egg quality. For women who are overweight, weight loss should be a primary focus before pursuing more invasive fertility treatments.
Weight loss through a combination of dietary changes and increased physical activity works better than either alone. A balanced diet that manages blood sugar is particularly important for women with PCOS because of insulin resistance. This means limiting refined carbohydrates and added sugars, eating adequate protein, including healthy fats, and focusing on whole foods.
Some evidence suggests that specific dietary approaches benefit women with PCOS. Lower glycemic index diets (foods that don’t spike blood sugar as much) appear to improve insulin sensitivity and fertility outcomes. Anti-inflammatory diets rich in vegetables, fruits, whole grains, and healthy fats may also help.
Physical activity improves insulin sensitivity independent of weight loss. Regular aerobic exercise combined with resistance training appears to be more effective than aerobic exercise alone. Exercise doesn’t need to be intense—even moderate activity like brisk walking regularly improves insulin resistance and PCOS symptoms.
Stress management may also impact PCOS. Elevated cortisol from chronic stress can worsen insulin resistance and hormone imbalances. Stress reduction through meditation, yoga, therapy, or other stress management techniques may support fertility.
Sleep quality affects fertility and insulin sensitivity. Women with PCOS have higher rates of sleep apnea and sleep disorders. Prioritizing good sleep hygiene and getting screened for sleep disorders if you have symptoms supports fertility.
Medical Treatments for PCOS-Related Infertility
When lifestyle changes alone don’t restore ovulation or achieve pregnancy, medical treatments can induce ovulation or improve fertility outcomes.
Metformin is an insulin-sensitizing medication that improves insulin resistance. By improving how your body uses insulin, metformin can help restore ovulation and improve fertility in women with PCOS. Metformin is often used as a first-line medication because it’s well-tolerated, has few side effects, and addresses an underlying problem in PCOS rather than just treating symptoms. Some doctors prescribe metformin even for women without diagnosed insulin resistance because of its benefits in PCOS.
Letrozole and clomiphene are medications that trigger ovulation by increasing follicle-stimulating hormone (FSH). These medications are typically tried first for women needing ovulation induction. Letrozole appears to be more effective than clomiphene for women with PCOS specifically, with higher pregnancy rates and lower miscarriage rates. Both medications are taken by mouth during the early part of the cycle.
If oral medications don’t induce ovulation, injectable gonadotropins (FSH) can stimulate the ovaries to develop and release an egg. These are more expensive and require more monitoring but are highly effective. Injectable gonadotropins carry higher risk of ovarian hyperstimulation syndrome (OHSS), a potentially serious condition where the ovaries become enlarged and fluid accumulates, so careful monitoring is important.
Inositol, a naturally occurring compound, has emerging evidence for improving ovulation and fertility in women with PCOS. Inositol improves insulin sensitivity and may improve egg quality. It’s available as a supplement and appears to have minimal side effects. Some doctors recommend inositol supplementation alongside or instead of metformin.
In vitro fertilization (IVF) is an option for women who don’t achieve pregnancy with other treatments. IVF involves stimulating the ovaries to produce multiple eggs, retrieving those eggs, fertilizing them with sperm in a laboratory, and transferring resulting embryos to the uterus. IVF success rates for women with PCOS can be slightly lower than for other infertility causes, partly because of higher OHSS risk and sometimes lower egg quality. However, with appropriate monitoring and protocols, IVF success rates in PCOS are still reasonable.
Ovarian drilling is a surgical procedure where small holes are made in the ovaries to reduce androgen production. This procedure can restore ovulation in some women with PCOS, but it’s rarely used now because medical treatments are effective and don’t carry surgical risks.
Working with a Reproductive Specialist
If you have PCOS and are trying to conceive, working with a reproductive endocrinologist (a specialist in fertility and hormonal conditions) is valuable. These specialists are experts in PCOS and understand how to optimize treatment for fertility.
A reproductive specialist will do a thorough evaluation including hormone testing, ultrasound assessment of your ovaries and uterus, assessment of your partner’s sperm if applicable, and testing for other fertility issues. They’ll also assess your metabolic status, insulin resistance, and thyroid function. This comprehensive evaluation helps create a targeted treatment plan.
Your specialist should discuss realistic timelines and success rates based on your specific situation. Age, BMI, degree of androgen excess, and presence of other fertility issues all affect success rates and treatment recommendations. Understanding these factors helps you make informed decisions about treatment.
Your specialist should also discuss the risks and benefits of different treatment options. Each option has different success rates, risks, costs, and demands on your time and body. You should understand these differences before starting treatment.
Frequently Asked Questions About PCOS and Fertility
Can I get pregnant naturally with PCOS?
Yes, many women with PCOS do get pregnant naturally, though it may take longer than for women without PCOS. The key is whether you’re ovulating. If you ovulate regularly or even occasionally, you have chances to conceive naturally. If you never ovulate or ovulate extremely rarely, medical treatment is usually needed.
How long should I try naturally before seeking treatment?
General fertility guidelines recommend seeking evaluation after one year of trying to conceive if you’re under 35, or after six months if you’re 35 or older. With PCOS, you might pursue evaluation sooner if you know you’re not ovulating regularly, as waiting longer may delay necessary treatment. Discuss timing with your doctor based on your age and circumstances.
Does PCOS mean I’ll definitely need IVF?
No. Many women with PCOS achieve pregnancy with oral medications like letrozole or clomiphene. IVF is reserved for women who don’t conceive with these simpler treatments. Starting with the least invasive option and escalating only if needed is the standard approach.
Will I miscarry more with PCOS?
Women with PCOS have higher miscarriage rates, possibly related to insulin resistance and inflammation. However, this doesn’t mean miscarriage is inevitable. Treating insulin resistance with metformin or inositol may reduce miscarriage risk. Many women with PCOS have healthy pregnancies and births.
Does PCOS get worse during pregnancy?
PCOS itself doesn’t change during pregnancy, but pregnancy hormones can mask PCOS symptoms. Many women find their PCOS symptoms improve during pregnancy because of hormonal changes. After pregnancy, symptoms typically return.
Can I have PCOS and regular periods?
Yes. Some women with PCOS have regular periods but still have hormonal and ovulatory abnormalities. If you have other PCOS features (excess androgens, polycystic ovaries on ultrasound, or insulin resistance) plus some menstrual irregularity, you can still be diagnosed with PCOS even if your periods are relatively regular.
Is PCOS genetic?
PCOS appears to have a genetic component—it runs in families. If your mother or sister has PCOS, your risk is higher. However, genetics alone don’t determine PCOS; environmental factors also play a role. Having a family history doesn’t mean you’ll definitely develop PCOS, but it increases your risk.
What’s the relationship between PCOS and thyroid disease?
Women with PCOS have higher rates of thyroid disease, particularly autoimmune thyroid disease. Thyroid dysfunction can worsen PCOS symptoms and affect fertility. If you have PCOS, thyroid screening is important.
Can PCOS be cured?
PCOS cannot be cured, but it can be effectively managed. With appropriate treatment—lifestyle changes, medication, or both—you can restore ovulation, improve fertility, and manage symptoms. However, PCOS will persist, and symptoms may return if treatment is discontinued.
Is my PCOS diagnosis permanent?
PCOS is a chronic condition, but diagnosis can sometimes be unclear. If you were diagnosed based on irregular periods and polycystic ovaries, and your periods become regular with treatment, you might question the diagnosis. However, underlying hormonal issues typically persist. Your doctor can clarify whether your diagnosis remains accurate based on current findings.
How will PCOS affect my fertility as I age?
PCOS doesn’t change how age affects fertility. Women with PCOS experience the same age-related decline in egg quality and quantity as other women. However, by restoring ovulation with treatment, women with PCOS can often conceive successfully into their 40s. Age remains a factor, but PCOS treatment can help overcome the fertility challenges it creates.
What if I’ve been trying for years without success?
If you’ve been trying for several years without conceiving, comprehensive evaluation by a reproductive specialist is important. Testing may reveal additional issues beyond PCOS that are affecting fertility. IVF may be the most effective option at this point. However, even after years of trying, many women do achieve pregnancy with appropriate treatment.
