Women who reach natural menopause before age 40 carry a 40% higher lifetime risk of heart attack or fatal coronary heart disease, according to research published in March. The study, led by Northwestern University, drew on data from more than 10,000 postmenopausal women enrolled across six major U.S. population studies spanning 1964 to 2018.
The elevated risk held up regardless of race. But the frequency of premature menopause varied sharply by race: Black women experienced it at a rate of 15.5%, compared to 4.8% among white women, more than three times as often.
Premature menopause occurs when the ovaries stop functioning before age 40. Researchers now estimate it affects roughly 3 to 4% of women in some form, higher than the previous standard estimate of 1%. Most cases have no clear explanation, though autoimmune diseases, infections, and genetic mutations can trigger the condition.
The mechanism connecting early menopause to heart disease runs through estrogen. Stephanie Faubion, MD, medical director of The Menopause Society, said the early loss of the hormone removes a layer of protection for the heart, brain, and bones. As estrogen drops, the body shifts in ways that strain the cardiovascular system. Lead author Priya Freaney, MD, an assistant professor of cardiology at Northwestern's Feinberg School of Medicine, described it plainly: "Our muscle mass decreases, our visceral fat increases, fat moves to the belly, our arteries stiffen, our cholesterol goes up, our blood pressure goes up."
Freaney said those changes cluster in the years immediately before and after menopause, creating what she called "an environment that is less healthy for the heart." She framed the findings as a call to action rather than cause for alarm. "We're talking about an event that happens before the midpoint of someone's life," she told Healthline. "The earlier we can implement prevention, the more impact we can have in the long term."
Experts recommend that women share their menopause history with their doctors and focus on blood pressure, cholesterol management, strength training, and stress reduction as early protective steps.
