Most women expect menopause to arrive around their early fifties. But for a small number, it happens much earlier, sometimes before they have even turned 40.
While early menopause is often associated with symptoms such as hot flashes, sleep problems and changes in menstrual periods, researchers are increasingly concerned about its possible long-term effects on the heart.
Now, a new study involving more than 4,700 women suggests there may be an important connection between premature menopause, higher insulin levels and an increased risk of heart disease.
The findings were announced on October 20, 2026, by The Menopause Society, ahead of their presentation at the organization's annual meeting in San Diego.
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Women who reached menopause before 40 showed a higher heart risk
The researchers examined health information from more than 4,700 postmenopausal women who participated in a major American health study known as ARIC.
The women were between 45 and 64 years old when they entered the study, and researchers followed their health records for an average of 21.4 years. During that period, 1,570 cardiovascular events were recorded across the study population.
When scientists compared the participants, they discovered that women who had experienced menopause before the age of 40 were more likely to develop cardiovascular disease, particularly coronary heart disease.
Coronary heart disease develops when the arteries supplying blood to the heart become narrowed or blocked, usually because of a buildup of fatty deposits. Over time, this can increase the risk of serious complications, including heart attacks.
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Interestingly, the researchers did not find a statistically significant increase in stroke or heart failure among women with premature menopause in this study.
They also found no clear increase in cardiovascular risk among women who entered menopause between the ages of 40 and 44, although that does not necessarily mean this group faces no additional risk.
A surprising discovery involving insulin
One of the study's most interesting findings involved insulin, a hormone that helps the body control blood sugar.
Normally, insulin allows sugar from food to move out of the bloodstream and into cells, where it can be used for energy. But when cells become less responsive to insulin, the body may need to produce more of it to keep blood sugar levels under control.
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This condition is known as insulin resistance and can develop long before someone is diagnosed with type 2 diabetes.
The researchers found that women who had experienced menopause before 40 had insulin levels approximately 9.3 percent higher than women who reached menopause at age 45 or later.
What made the result particularly interesting was that their fasting blood sugar levels were not significantly different.
In other words, women with premature menopause had higher insulin levels even though their blood sugar measurements appeared similar to those of other participants.
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The findings suggest that the body may be working harder to maintain normal blood sugar levels, although the study does not prove that every woman with higher insulin had insulin resistance.
Why this could help explain the connection to heart disease
Scientists have known for years that women who experience menopause unusually early may face an increased risk of cardiovascular problems.
What has been less clear is why this happens.
Estrogen, one of the main hormones produced by the ovaries, helps regulate several processes involved in cardiovascular health. When menopause happens earlier than expected, estrogen levels fall at a younger age, potentially affecting cholesterol, blood vessels and the way the body processes energy.
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According to the American Heart Association, the menopause transition can be accompanied by changes in cholesterol levels, body composition and metabolic health that contribute to cardiovascular risk.
The new research suggests that insulin resistance could be another important part of the explanation.
Dr. Zailing Xing, the study's first author, said the findings highlight a possible biological connection between premature menopause and heart disease. The researchers believe understanding this relationship could eventually help doctors identify women who might benefit from earlier preventive care.
Dr. Stephanie Faubion, medical director of The Menopause Society, also emphasized the importance of the discovery.
"This study suggests that insulin resistance may be one of the biological pathways involved," she said.
However, higher insulin levels alone do not establish that insulin resistance caused the increased heart risk. More research is needed to determine exactly how these changes are connected.
Previous research found a 40 percent higher risk
The latest findings add to earlier evidence suggesting that the age at which menopause begins can influence cardiovascular health decades later.
As previously reported by Welltica, earlier research presented at an American Heart Association scientific conference found that women who experienced menopause before 40 had a 40 percent higher lifetime risk of coronary heart disease.
That research examined women from different racial backgrounds and found that the association remained even after researchers accounted for several established risk factors, including smoking, high blood pressure, diabetes and obesity.
The new study does not report the same 40 percent risk increase. Instead, it adds another piece to the puzzle by identifying higher insulin levels as a possible explanation for the association.
Both studies are observational, meaning they can identify patterns between health conditions but cannot prove that one directly causes another.
What women with premature menopause should know
Premature menopause affects approximately one percent of women, according to The Menopause Society. Although relatively uncommon, it deserves medical attention because its consequences can extend beyond the familiar symptoms of menopause.
Women who stop having periods before age 40 should speak to a healthcare professional to determine whether they may have premature ovarian insufficiency, a condition in which the ovaries stop functioning normally earlier than expected.
Doctors can investigate possible causes and discuss how the condition may affect fertility, bone strength and cardiovascular health.
The UK's National Institute for Health and Care Excellence (NICE) recommends offering hormone replacement therapy or a combined hormonal contraceptive to people with premature ovarian insufficiency, unless there are medical reasons why these treatments would be unsuitable.
Treatment is generally recommended until at least the usual age of natural menopause, partly because losing estrogen at a young age can affect long-term health.
Women with premature menopause may also benefit from discussing their cardiovascular risk factors with a doctor, including blood pressure, cholesterol, blood sugar, smoking and physical activity.
The latest study raises questions about whether insulin measurements could eventually help identify higher-risk patients, but it does not establish that everyone with premature menopause needs routine insulin testing.
The findings are an early warning, not a diagnosis
There is an important limitation to the research. The findings were announced for presentation at The Menopause Society's 2026 Annual Meeting, which runs from October 20 to 24 in San Diego.
At this stage, the publicly available results come from a conference announcement rather than a fully published, peer-reviewed research paper. That means important details about the analysis still need to be examined.
The findings also do not mean that every woman who experiences menopause before 40 will develop heart disease. An increased statistical risk is not the same as an inevitable health problem.
Nevertheless, the research adds to growing evidence that menopause is more than a change in reproductive health. The age at which it happens may also provide doctors with useful information about a woman's future cardiovascular health.
For women who have experienced menopause unusually early, the message is not to expect heart problems, but to make sure their doctor knows their medical history and can help them manage any risk factors before serious complications develop.
This article is made and published by Aksel Kryhlmand, who may have used AI in the preparation.