Understanding Primary Ovarian Insufficiency (POI)

Primary Ovarian Insufficiency (POI) is a condition in which the ovaries lose normal function before the age of 40. When this happens, the ovaries stop releasing eggs regularly and stop making their usual amounts of hormones, especially estrogen. The most common sign is that periods become irregular or stop altogether.

Unlike natural menopause, ovarian function in women with POI can fluctuate. Some women continue to ovulate occasionally and, in some cases, pregnancy is still possible. Because the condition affects women during their reproductive years, early diagnosis and individualized care are especially important.

POI is a real, recognized medical condition, and it is not your fault. It cannot be reversed, but it can be treated. Proper treatment can manage symptoms and make a genuine difference to how you feel now, support long-term health, and address fertility goals.

Condition At A Glance

Quick Facts About Primary Ovarian Insufficiency

Also Called

Primary Ovarian Insufficiency (formerly called Premature Ovarian Failure or POF)

Estimated Prevalence

Approximately 1% of women under age 40

Most Common Age at Diagnosis

Before age 40

Body Systems Affected

Reproductive, endocrine, skeletal, cardiovascular

May Affect

Menstrual cycles, fertility, estrogen production, bone density, heart health

Role of Laboratory Testing

Evaluates ovarian function, reproductive hormones, thyroid health and adrenal function, and helps identify possible underlying causes

A Note on the Different Names

You may have heard this condition called several things: premature ovarian failure, premature menopause, or early menopause. Doctors now prefer the term primary ovarian insufficiency, because “failure” is both discouraging and not quite accurate. In POI, ovarian function can come and go rather than stopping completely, which is an important difference.

When the ovaries stop working between the ages of 40 and 44, that is usually called early menopause rather than POI.

You Are Not Alone

POI is more common than doctors once believed. It was long thought to affect about 1 in 100 women under 40, but recent research shows the number is closer to 4 in 100. If you have been given this diagnosis, you are one of many women navigating it, and there is well-established guidance for your care.

Common Signs and Symptoms

Symptoms differ from woman to woman, and some are related to lower estrogen levels. You might notice:

• Periods that become irregular, less frequent, or stop
• Hot flushes or night sweats
• Vaginal dryness or discomfort
• Trouble sleeping
• Difficulty getting pregnant
• Changes in mood, energy, or concentration (brain fog)
• Pain during intercourse
• Decreased sexual desire
• Sleep disturbances

Some women have very few symptoms, and for some, symptoms come and go as ovarian activity changes. A small number of women never start having periods at all, which can also be a sign of POI.

What Causes Primary Ovarian Insufficiency?

There are several possible causes, and it is important to know that for most women, no specific cause is ever found. That is common, and it does not mean anything was missed.

• No identified cause. This is the most frequent situation, and doctors call it “idiopathic” POI.
• Medical treatment. Chemotherapy, radiation therapy, or surgery involving the ovaries can lead to POI.
• Genetic causes. Certain inherited conditions, such as Turner syndrome or a change in the Fragile X gene, can be involved. POI can also run in families.
• Autoimmune conditions. Sometimes the body's immune system affects the ovaries, the thyroid, or the adrenal glands.

How Is POI Diagnosed?

POI is diagnosed using your menstrual history together with blood tests. Generally, a diagnosis is made when both of these are true:

• Your periods have been irregular or absent for at least four months, and you are under 40.
• A blood test shows a high level of follicle-stimulating hormone (FSH). If the result is unclear, your doctor will usually repeat this test about four to six weeks later.

A low estrogen level supports the diagnosis, though it is not enough on its own. Your doctor will also rule out pregnancy first, and will consider whether hormonal birth control might be masking your symptoms

Good to know: FSH is the main test for diagnosing POI. You may also have an AMH test, but this is used to add information, not as the main test on its own.

Once POI is confirmed, your doctor may recommend a few further tests to look for a cause, including thyroid tests, a test for adrenal antibodies, and genetic testing. Genetic testing usually comes with counseling beforehand, so you understand what the results could mean for you and your family.

Why Laboratory Testing Matters

Laboratory testing helps healthcare providers evaluate ovarian function, determine whether estrogen production has declined, and rule out other conditions that may cause similar symptoms.

Depending on your symptoms and medical history, your healthcare provider may recommend testing that includes:

• Follicle-stimulating hormone (FSH)
• Luteinizing hormone (LH)
• Estradiol
• Anti-Müllerian hormone (AMH), when appropriate
• Thyroid function tests
• Prolactin
• Pregnancy testing when indicated
• Additional testing for autoimmune or genetic conditions based on your clinical presentation

Laboratory results help guide diagnosis, treatment planning, and long-term monitoring.

Understanding Your Hormones

Scroll the table horizontally to compare all columns.

POI and Fertility

For many women, one of the most emotionally challenging aspects of POI is its potential effect on fertility. Getting pregnant naturally becomes much less likely, and it is completely normal to need time and support to process this.

It is worth knowing that ovarian function in POI can be unpredictable. A small number of women do become pregnant naturally, most often in the period soon after diagnosis. Because of this, your doctor will talk with you about contraception if pregnancy is not something you want right now.

If you hope to have children, there are paths worth discussing with a fertility specialist, including donor eggs or embryos, and, for some women, the use of eggs or ovarian tissue frozen before medical treatment. A specialist can walk you through what applies to your situation.

Treatment And Long-Term Health

Treatment focuses on managing symptoms, replacing hormones when appropriate, protecting long-term health, and supporting quality of life.

Your healthcare provider may recommend:

• Hormone replacement therapy (when appropriate)
• Calcium and vitamin D to support bone health
• Regular weight-bearing exercise
• Cardiovascular risk assessment
• Emotional support or counseling
• Fertility counseling or referral to a reproductive endocrinologist

Because POI affects estrogen production during years when women would normally still be producing this hormone, ongoing follow-up is important to help protect bone and cardiovascular health.

Your Emotional Wellbeing Matters

A POI diagnosis can bring up a lot: sadness, anger, grief, anxiety, or a sense of isolation. Some women also feel relief at finally having an explanation. All of these reactions are normal.

You do not have to manage this on your own. Talk with your healthcare provider about how you are feeling. Counseling and mental health support are a recognized part of good POI care, not an afterthought. Many women also find real value in connecting with others who understand. Patient support organizations can help you find a community.

MDL’s POI Testing Panel

MDL offers a POI panel that supports your doctor in two ways: confirming the diagnosis and looking for a possible underlying cause. Your doctor will decide which tests are right for you.

Confirming the diagnosis. These are the central tests:

• FSH - the main test used to diagnose POI, often repeated to confirm.
• Estradiol (estrogen) - helps confirm that hormone levels are low.
• LH and progesterone - other cycle hormones that help complete the picture.
• AMH - gives additional information about ovarian reserve, used alongside FSH rather than in place of it.

Looking for a cause. If a cause is not already known:

• Thyroid tests - TSH, Free T4, and thyroid antibodies, since thyroid conditions often occur alongside POI.
• Prolactin - to rule out other conditions that can stop periods.

Protecting your long-term health. Because lower estrogen earlier in life affects bone and heart health, these are followed over time:

• Vitamin D - important for bone health, which needs particular attention in POI.
• Cholesterol and blood sugar - to keep an eye on cardiovascular risk.

Your wider hormone picture. Sometimes added to guide treatment:

• Testosterone and free testosterone - relevant if low sexual desire is a concern, since testosterone therapy is one option your doctor may discuss.
• SHBG and DHEA-S - which affect how your hormones circulate.

Not sure what you need? Your healthcare provider can order the tests that fit your symptoms and history.

POI Myth Vs. Fact

Understanding Primary Ovarian Insufficiency

Myth

POI is the same as early menopause.

Fact

Although the symptoms can be similar, POI and natural menopause are not the same. Women with POI may still have intermittent ovarian function and occasional ovulation.

Myth

Women with POI can never become pregnant.

Fact

Although fertility is reduced, spontaneous pregnancy can still occur in some women. Your healthcare provider can discuss fertility options based on your individual situation.

Myth

Missing one or two periods means you have POI.

Fact

Many conditions can cause irregular menstrual cycles. A comprehensive medical evaluation is necessary before a diagnosis can be made.

Myth

POI only affects fertility.

Fact

POI may also affect bone health, cardiovascular health, sexual health, mood, and overall well-being because estrogen supports many systems throughout the body.

Myth

There is nothing that can be done after a diagnosis.

Fact

Although ovarian function usually cannot be restored, treatments are available to help manage symptoms, protect long-term health, and support quality of life.

Earlier Answers Can Support Better Long-Term Health

If you have experienced irregular menstrual cycles, symptoms of estrogen deficiency, or concerns about fertility before age 40, talk with your healthcare provider about whether a comprehensive evaluation is appropriate. MDL's endocrinology testing provides clinically meaningful information to support diagnosis, treatment planning, and long-term management.

Related Conditions

Healthcare providers may also evaluate for:

• Thyroid Disorders
• PMOS/PCOS
• Menopause and Perimenopause
• Autoimmune Disorders
• Adrenal Disorders

Frequently Asked Questions (FAQ) About Primary Ovarian Insufficiency (POI)

Our Medical Sources

The information on this page follows current international guidance, including:

• The 2024 Evidence-Based Guideline on Premature Ovarian Insufficiency, developed jointly by ESHRE, the American Society for Reproductive Medicine (ASRM), Monash University's CREWHiRL centre, and the International Menopause Society (Panay N, et al.).
• The earlier 2016 ESHRE POI guideline (Webber L, et al.), which the 2024 guideline builds upon.
• The ESHRE POI patient resource (2024 edition).