Polycystic Ovary Syndrome (PCOS) and Fertility

What is PCOS?

Polycystic ovary syndrome (PCOS) is a common hormonal condition in people with ovaries. Despite the name, it is not about having “cysts”: the ovaries contain many small follicles that have not matured into an egg. PCOS is linked to higher levels of androgens (sometimes called “male” hormones) and, in many people, insulin resistance.

Signs and symptoms

• Irregular, infrequent or absent periods
• Acne, oily skin, or excess hair on the face or body
• Thinning scalp hair
• Weight gain or difficulty losing weight
• Darkened skin patches
• Trouble getting pregnant

Not everyone has every sign, and symptoms vary widely.

How PCOS affects fertility

Ovulation depends on a coordinated hormone signal between the brain and ovaries. In PCOS that signal is disrupted, so an egg may be released rarely or not at all. When ovulation does not happen, pregnancy cannot. Cycle length can be unpredictable, which is why the ovulation calculator may be less reliable and why ovulation (LH) tests or clinician monitoring can help.

How PCOS is diagnosed

A clinician reviews your symptoms and cycles, orders blood tests (including androgens, thyroid and prolactin to rule out other causes) and may perform a pelvic ultrasound. A diagnosis usually requires at least two of three features: irregular ovulation, signs of high androgens and polycystic-appearing ovaries.

Treatment when you want to conceive

1. Lifestyle support. For people above a healthy weight, modest weight loss can restore ovulation. See weight and exercise and nutrition.
2. Ovulation-inducing medication. Letrozole is commonly used first, with clomiphene as an alternative. Metformin may help some people with insulin resistance.
3. Injectable medication or IUI. If oral medicines do not work, gonadotropins with monitoring and sometimes IUI can be used, with care to avoid multiple pregnancy.
4. Laparoscopic ovarian drilling or IVF. These are options when other approaches have not worked. IVF can also be an early choice when other factors are present.

Other health considerations

PCOS is associated with a higher risk of type 2 diabetes, high blood pressure, sleep apnea, and pregnancy complications such as gestational diabetes. Seeing a clinician before pregnancy to check blood sugar and blood pressure is a good idea.

Types and presentations of PCOS

PCOS is a spectrum, not a single picture. Clinicians describe different “phenotypes” depending on which combination of features is present. Some people have irregular cycles and high androgens but normal-looking ovaries on ultrasound. Others have polycystic-appearing ovaries and irregular ovulation without obvious signs of high androgens. Some have all three features. This matters because the fertility outlook and the best treatment can differ, and it explains why two people with PCOS can have very different experiences.

Insulin resistance and metabolic health

Many people with PCOS, at every body size, have some degree of insulin resistance, which means the body needs more insulin than usual to keep blood sugar steady. High insulin can push the ovaries to produce more androgens, which in turn interferes with ovulation. This link is why lifestyle approaches, and sometimes metformin, are part of PCOS care.

A clinician may check fasting glucose or an oral glucose tolerance test, cholesterol and blood pressure. Finding and managing metabolic issues before pregnancy lowers risks later, including gestational diabetes.

Tracking ovulation with PCOS

Standard ovulation calculators assume a regular cycle, which many people with PCOS do not have. If cycles vary from 35 to 90 days, predicting a fertile window from the last period is unreliable.

• LH ovulation tests can give false positives because LH can be high throughout the cycle in PCOS. Use them together with other signs.
• Basal body temperature charting can confirm ovulation after it has happened and show whether you ovulate at all.
• Mid-luteal progesterone blood tests, ordered by a clinician about a week after suspected ovulation, can confirm it.
• Ultrasound monitoring during a medicated cycle gives the clearest view of follicle growth.

Our cycle log and cycle tracking guide explain how to record what you see.

Realistic expectations on timing

A common worry is that PCOS means a very long road. Many people with PCOS ovulate with oral medication within a few cycles, and many conceive within six months of starting treatment. Some need more time or more advanced treatment. Age matters as much as the diagnosis, so the same timeline guidance applies: if you are 35 or older, or have not conceived after several medicated cycles, ask about next steps such as IUI or IVF.

Looking after your mental health

PCOS is associated with higher rates of anxiety and low mood, and the visible features such as acne or excess hair growth can affect how people feel about themselves. Fertility worries add to this. Talk with your clinician if you notice persistent low mood, and see stress and emotional health. Support groups and counselors who understand PCOS can help.

Questions to ask your clinician

• Which PCOS features do I have, and what does that mean for treatment?
• Should I be tested for diabetes, cholesterol and blood pressure problems?
• Is letrozole or another medication right for me, and how will ovulation be monitored?
• How many medicated cycles should we try before considering other options?
• Does my partner need a semen analysis now, so we do not lose time?

When to see a clinician

See a clinician if you have missed periods for three months, cycles that are very irregular, or signs of high androgens, or if you have been trying for six months to a year depending on your age. Our timing check can help.