This article is part of WHA’s new perimenopause and menopause series.

Menopause happens naturally with declining hormone levels around age 51. But every person’s journey is unique. For some, menopause may arrive earlier than expected, a condition known as early-onset menopause when it occurs in your 40s. When it happens before age 40, it’s known as premature ovarian insufficiency (POI).

Early-onset menopause and premature ovarian insufficiency can be surprising and raise many questions about symptoms, fertility and long-term health. Like with most things, a better understanding helps clear up common misconceptions and, if you’re experiencing one of them, hopefully get you closer to living the life you want.

Quick glossary
  • Perimenopause – The transitional phase before menopause when hormone levels fluctuate, often causing symptoms like irregular periods, hot flashes and mood changes. Typically begins early- to mid-40s.
  • Menopause – The natural end of menstruation, typically occurring around age 51, marked by 12 consecutive months without a period and decreased hormone levels.
  • Early-onset menopause – Menopause that occurs between ages 40 and 45, earlier than the average age of 51.
  • Premature ovarian insufficiency – A condition where the ovaries stop functioning before age 40, leading to irregular periods, low hormone levels and reduced fertility.

What Is early-onset menopause?

Menopause is a wholly natural part of aging. It occurs because hormone levels like estrogen and progesterone decrease and the ovaries stop releasing eggs (i.e., ovulation ceases). However, for some, menopause can occur earlier than expected, which is known as early-onset menopause.

In the years leading up to menopause, the transitional stage of perimenopause is marked by fluctuating hormone levels. Symptoms like irregular periods, hot flashes and mood changes may appear during this time. Early-onset menopause often shares these symptoms, which is what makes diagnosis difficult. While we don’t always know what leads to early-onset menopause, potential causes may include:

  • Genetic factors
  • Environmental influences
  • Smoking
  • Socioeconomic and racial health disparities

If you’re experiencing symptoms of peri/menopause earlier than expected, don’t hesitate to speak with your provider. They will be able to confirm a diagnosis and then get you treatment to manage symptoms. Know that once peri/menopause begins—whether regular, early-onset or due to POI—it cannot be reversed.

What is premature ovarian insufficiency (POI)?

Premature ovarian insufficiency occurs when the ovaries stop working properly before age 40, leading to low hormone levels, irregular periods and reduced fertility. Unlike menopause, POI doesn’t always mean the ovaries stop functioning entirely. Those with POI may still have intermittent ovarian function, leading to ovulation and a small chance of spontaneous pregnancy.

While 20-30% of individuals with POI develop it due to genetic factors, other possible causes include:

  • Chromosomal abnormalities
  • Autoimmune diseases
  • Iatrogenic treatments, such as chemotherapy or surgery to remove the ovaries or uterus
  • Viruses, such as HIV

In 20% of cases, unexplained factors contribute. While POI can be an emotional and physical challenge, there are treatment options to help manage symptoms and plan for the future—especially for those concerned about conceiving.

Symptoms, diagnosis and treatment of early-onset menopause and POI

Recognizing early-onset menopause or premature ovarian insufficiency is sometimes challenging, as symptoms often overlap with typical peri/menopause.

Symptoms of early-onset menopause and POI

Both conditions share common symptoms, including:

  • Irregular or missed periods
  • Hot flashes and night sweats
  • Mood changes, such as irritability or anxiety
  • Low energy or fatigue

While these symptoms are similar to those of typical peri/menopause, younger people may experience more fluctuating hormone levels, and thus, more severe symptoms.

How they’re diagnosed

Diagnosis starts with evaluating symptoms and confirming hormone levels. Providers look for:

  • Missed periods: absence of periods for three consecutive months. We may recommend a pregnancy test.
  • Confirmed hormonal testing: blood tests measuring lowered follicle-stimulating hormone (FSH) and estradiol levels are typically repeated twice to confirm a diagnosis. It is also important to check a few other hormones like Prolactin and TSH.

Hormone testing for POI and early menopause is unique and is not generally recommended when menopause or even perimenopause is being evaluated.

  • For POI: evidence of intermittent ovarian function through additional testing. Your clinician may recommend other testing based on your symptoms like testing for diabetes, HIV and genetic testing, as well as testing for adrenal diseases.

Timely diagnosis allows for personalized care to manage health risks like bone density loss and heart disease.

Treatment options

These conditions present unique considerations because of the age at which they happen, making early diagnosis and treatment essential for long-term health.

Treatment for early-onset menopause and POI often mirrors typical peri/menopause care, focusing on symptom relief and prevention of long-term complications. Menopause hormone therapy (MHT, formerly known as HRT) is often used to stabilize hormone levels, reduce symptoms and protect bone and cardiovascular health. If MHT isn’t right for you, there are other options, too.

But because of the younger age these conditions start, unique factors must be considered:

Fluctuating hormone levels can make managing symptoms more complex.

  1. Even with irregular cycles, spontaneous ovulation is still possible, so contraception may be necessary.
  2. With proper treatment and support, those facing early-onset menopause or POI can lead healthy, fulfilling lives while minimizing potential complications.

How do early-onset menopause and POI affect fertility?

Fertility is understandably a top concern for those diagnosed with early-onset menopause or premature ovarian insufficiency.

In cases of early-onset menopause, the loss of ovarian function typically leads to infertility, as the body is no longer releasing eggs. POI, however, is different; it often involves intermittent ovarian activity, which means there is still a small chance (5-10%) of spontaneous pregnancy even after diagnosis.

For those who want to conceive, early diagnosis is essential to explore family planning options. Your provider can refer you to a reproductive medicine specialist to help clarify the best approach based on your individual situation and goals.

Long-term health implications

Experiencing menopause earlier in life may have lasting effects. The loss of estrogen at a younger age increases the risk of osteoporosis and also raises the likelihood of cardiovascular disease, as estrogen plays a key role in protecting heart health.

Beyond physical health, it’s common to experience changes in mental health, including a higher risk of anxiety, depression and sleep disorders. Support systems and counseling make a big difference in navigating these risks.

Treatment options like MHT help reduce physical risks, while counseling or support groups address emotional well-being. Remember, you’re not alone, and resources are available to help you manage both the physical and emotional aspects.

Understandably, early-onset menopause and premature ovarian insufficiency can feel overwhelming, but there are many personalized care solutions—and WHA providers— ready to help based on your specific needs. If you’re experiencing symptoms and aren’t yet at the “typical” menopausal age, make an appointment to speak with your provider. You are not alone in this journey, and you have options, more than you likely know!