Heart Disease is the #1 Killer of Women. And Midlife Is When Your Risk Actually Climbs

Heart disease kills more women in the US than anything else. And it’s not even close.

About 1 in every 5 female deaths is from heart disease. Over 60 million American women are living with some form of it right now. The shocking part is that only about half of women even know it's their #1 threat.

We've been trained to worry about breast cancer-and it’s a real concern, but heart disease kills more of us, quietly, while we're not even watching for it.

A friend of mine, in her 60s, healthy, active, not overweight, had a heart attack out of nowhere. Rapid heart rate, no warning signs she recognized. She's now facing triple bypass surgery. If you'd looked at her, you would NEVER guess. Healthy, vibrant, energetic! This is the scary disease we're talking about. Most women don’t know.  You may even have a story where it has hit entirely too close to you. 

What actually is “heart disease”?

"Heart disease" isn't one thing. It's an umbrella term that covers:

• Coronary artery disease (CAD) — plaque buildup narrowing the arteries that feed your heart. The most common type, and the focus of this series.

• Heart attack— when a blockage cuts off blood flow to part of the heart.

• Heart failure — when the heart can't pump effectively.

• Arrhythmias — irregular heartbeats, including the kind that can precede a cardiac event.

Why this hits different for women

Heart disease isn't just under diagnosed in women, It's under-recognized even by medical professionals. Research on missed heart attacks in emergency rooms shows women are significantly more likely to be sent home when they're actually having a cardiac event, partly because women's symptoms often don't look like the movie version of chest-clutching, collapsing, and an obvious crisis. Fatigue, nausea, jaw or upper back pain, and shortness of breath can be how it presents. We'll go deeper on this in Part 2.

A big missing piece: why midlife is a turning point

Here's what surprised me most when I was researching: Women have a lower rate of heart disease than men through most of adulthood. That gap closes fast after menopause and it isn't random timing…it's estrogen.

Estrogen isn't just a reproductive hormone. It's doing real work for your cardiovascular system:

• It keeps blood vessels flexible. Estrogen supports nitric oxide production, which helps blood vessels relax and dilate. Less estrogen means stiffer, less responsive vessels.

• It helps support healthy cholesterol levels. Estrogen helps raise HDL, and lower LDL. As estrogen drops, that balance typically shifts in the wrong direction.

• It affects where your body stores fat. The menopause transition is linked to a shift toward more visceral (abdominal) fat, which carries its own cardiovascular risk, independent of weight changes.

Timing matters, too. Women who go through early menopause (before 40) have about a 40% higher risk of coronary heart disease compared to women who reach menopause around the age of 50. And if you've had hot flashes or night sweats, that's not just a comfort issue: vasomotor symptoms are associated with a higher cardiovascular risk profile, including higher blood pressure and cholesterol. This means that there is  likely a strong correlation between estrogen levels and cardiovascular health and is a worthy conversation to bring up to your provider in this stage of life. 

A quick, important note on hormone therapy: current guidance doesn't support starting HRT specifically as a way to lower cardiovascular risk. But it's worth understanding why that's a nuanced answer rather than a flat no. Physiologically, we know estrogen supports vascular flexibility and healthy cholesterol levels, so being hormonally supported could plausibly play a protective role for some women. Research on timing (starting HRT closer to menopause onset vs. many years later) suggests the picture isn't the same for everyone. What that means practically: this is a real, worthwhile conversation to have with your provider

Why this matters right now

If you're in perimenopause or menopause, this is the window where your risk factors can shift quietly, often before you feel anything. That's exactly why the stakes are different in midlife than they were in your 20s or 30s, and why "I feel fine" isn't the same reassurance it used to be. You can feel totally fine and look healthy while still having issues that we can impact through lifestyle and other interventions and these can be potentially life saving. 

What's next in this series

In part 2, we’re going to cover what's actually in your control, what labs and testing genuinely matter (including what your CAC score isn't telling you), and exactly what to say to your doctor to get taken seriously.

Your move

I have a favor to ask. Send this article to a woman you care about in midlife. They might not know, they may think this is something they don’t have to worry about. Maybe they think it’s an “old person problem” (it’s not.) For a lot of us, midlife is already the window that matters and there is a lot we can do to impact our risk in a positive way.