These facts about heart disease might surprise you, but knowing them is one of the most powerful things you can do for your long term health.

Yes, cardiovascular disease often develops silently for years before symptoms appear, and it’s the leading cause of death worldwide. But here’s why I became a preventive cardiology dietitian: it’s largely preventable. By the time you reach fact #10, you’ll see just how much is truly in your control.

In this article, you’ll learn 10 eye-opening facts about heart disease that can help you recognize your personal risk, know which numbers matter most, and take proactive steps toward long term heart health.

#1: Heart disease is the leading cause of death worldwide

One of the most important facts about heart disease is that it is the leading cause of death worldwide. 

Additionally, global cardiovascular disease deaths continue to rise, which is largely due to population growth and aging. 

Approximately 85% of these deaths are caused by heart attacks and strokes. A heart attack occurs when blood flow to the heart muscle is blocked, causing damage to the heart tissue. A stroke occurs when blood flow to part of the brain is interrupted, leading to brain cell injury or death.

#2: About 7.7 million U.S. adults live with heart failure. 

An estimated 7.7 million U.S. adults are living with heart failure. This is up from the prior estimate of 6.6 million, indicating a growing prevalence of heart failure. 

Living with heart failure means that your heart isn’t pumping blood as effectively as it should. This leads to the body not getting proper oxygen and nutrients. It’s a chronic condition that many people can manage. 

Day to day, it can feel like shortness of breath, fatigue or low energy, fluid buildup, and reduced ability to stay active. 

However, early action and targeted nutrition can help prevent heart failure and slow its progression if it does develop.

#3: More than half the U.S. population doesn’t know heart disease is the leading cause of death

Heart disease has been the leading cause of death (yes, over cancer in both men and women)  in the U.S. for over 100 years, yet half the population doesn’t realize it. 

This knowledge gap is potentially harmful because nearly half of the U.S. population has high blood pressure, a risk factor for heart attack, stroke, heart failure, and kidney disease. 

Many individuals also have other silent risk factors that can be controlled, such as elevated LDL cholesterol, insulin resistance, inflammation, or early plaque buildup. 

#4: About 1 in 5 heart attacks are “silent” 

A silent heart attack means that the person didn’t realize they even had one. It’s when symptoms are mild, atypical, and not recognized. 

Later, the heart attack can be detected through an ECG or imaging of the heart. Because silent heart attacks often go untreated, they can contribute to long-term damage to the heart muscle and increase the risk of complications later. 

Prevention is possible through managing risk factors such as blood pressure, blood sugar, cholesterol, and weight with targeted, science based nutrition. 

#5: Women’s heart attack symptoms are often different from men’s

Heart attacks in women can go underrecognized because symptoms can be atypical, and cardiovascular disease has historically been viewed as a condition that primarily affects men. 

That’s why it’s so important for women to be proactive and active participants in their own care. Advocating for yourself, asking the right questions, and knowing your numbers is essential to overcoming these disparities. It’s something I’m passionate about and share regularly on my social media.

Here are a few ways heart attacks look different in women: 

• Women may not have the classic chest pain feeling, but rather may experience symptoms such as fatigue, shortness of breath, sleep difficulties, or a general feeling of illness. 
• Women often develop ischemic heart disease later in life, particularly after menopause when estrogen’s protective effects decline.
• Women are more likely to present with unstable angina rather than a classic ST-elevation heart attack (STEMI). 
• Women are more likely to experience heart attacks without major artery blockages (MINOCA), which can present as atypical symptoms. This type often involves smaller blood vessels that are harder to detect on standard imaging, which may explain why symptoms can look and feel different, too.

#6: Higher coronary calcium scores (CAC) are linked to a 3-5x greater risk of sudden cardiac death 

A coronary calcium score measures hard plaque in your coronary arteries, which is useful, but it’s worth knowing it doesn’t tell the whole story. It doesn’t detect soft plaque, which is actually the more dangerous type because it’s more prone to rupture. So while a low CAC score can feel reassuring, it doesn’t rule out risk entirely.

The good news is that hard plaque can be stabilized, and soft plaque can be regressed through personalized nutrition. 

A higher coronary calcium score reflects a greater burden of atherosclerosis and is associated with an increased risk of sudden cardiac death. 

Research shows a stepwise increase in sudden cardiac death risk as CAC scores rise:

• CAC 100–399: about 3x higher risk
• CAC 400–999: about 4x higher risk
• CAC ≥1000: about 5x higher risk

Atherosclerosis can develop silently over the years without any obvious symptoms, but your labs can actually tell you if plaque is building before it becomes a more serious problem. That’s exactly why I created Know Your Numbers: Heart Labs Explained, my step-by-step course that teaches you which heart health labs are essential, why they matter, and how to interpret your results — so you can take informed, proactive steps toward prevention. 

#7: Heart disease often starts decades before symptoms appear

The buildup of plaque in your arteries can begin as early as childhood and slowly progress through the years, without you even knowing it. 

Most people don’t experience symptoms until plaque buildup becomes advanced enough to trigger a major cardiovascular event. 

Understanding these facts about heart disease can help you take a proactive approach before a major cardiovascular event ever happens. 

#8: You can have a low LDL and high inflammation at the same time, and that can still accelerate heart disease

LDL cholesterol is a key driver of plaque formation in the arteries, and because apoB is most often carried on LDL particles, lowering LDL can also help reduce apoB and the overall burden of atherogenic lipoproteins in circulation.

But LDL isn’t the only number that matters. Research shows that LDL, inflammation (measured by hs-CRP), and a cholesterol-like particle called lipoprotein(a) each independently raise cardiovascular risk. 

Together, these markers paint a more complete picture of what’s happening inside your arteries. You can have a low LDL and still have active inflammation or elevated lipoprotein(a) that contributes to plaque progression and increases your risk of a cardiovascular event.

#9: People with a high genetic (polygenic) risk for heart disease can reduce their risk nearly 50% through lifestyle modifications

Individuals with high genetic risk who followed a healthy lifestyle had a 46% lower risk of coronary events compared with those with unhealthy habits. 

In fact, people with high genetic risk but an optimal lifestyle had lower cardiovascular risk than those with low genetic risk but poor lifestyle habits. 

This shows that modifiable risk factors can influence long term heart outcomes, even in the presence of inherited risk. As a cardiovascular dietitian with elevated lipoprotein(a) and a strong family history of heart disease, I understand how concerning genetic risk can feel. 

While lipoprotein(a) levels are largely determined by genetics and may continue to contribute to cardiovascular risk, healthy lifestyle habits can still significantly reduce overall heart disease risk by improving other cardiometabolic pathways.

#10: Up to 99% of heart attacks, strokes, and heart failure are associated with risk factors that can be prevented

The overwhelming majority of cardiovascular events are associated with modifiable risk factors like high blood pressure, insulin resistance, smoking, poor diet quality, and physical inactivity. 

Heart disease often develops silently over the years, with no obvious symptoms. This is why knowing your numbers can lead to an empowering, proactive approach. When you understand your lab markers early, you can take steps to improve them and maintain them within an optimal range.

As a cardiovascular dietitian, I share these facts not to create fear, but to increase awareness and help you take a proactive and empowered approach to preventing and managing heart disease.

Over the past 14 years, I have guided clients in understanding and optimizing their cardiometabolic lab markers to support long term cardiovascular health. 

FAQs on Facts About Heart Disease 

What are facts about heart disease? 

There are many facts about heart disease. Here are the facts this article covered: 

• Heart disease is the leading cause of death worldwide
• About 7.7 million U.S. adults live with heart failure
• More than half the U.S. population doesn’t know heart disease is the leading cause of death
• About 1 in 5 heart attacks are “silent”
• Women’s heart attack symptoms are often different from men’s and heart attacks can present differently 
• Higher coronary calcium scores (CAC) are linked to a 3–5x greater risk of sudden cardiac death
• Heart disease often starts decades before symptoms appear
• A ~40 mg/dL drop in LDL can lower heart attack and stroke risk by about 30%
• People with a high genetic (polygenic) risk for heart disease can reduce their risk nearly 50% through lifestyle modifications
• Up to 99% of heart attacks, strokes, and heart failure are associated with risk factors that can be prevented

What are facts about heart attacks? 

Heart attacks occur when blood flow to the heart muscle is blocked, usually by plaque buildup in the coronary arteries.

• Plaque develops slowly over many years, even if symptoms feel sudden
• About 1 in 5 heart attacks are silent and may go unrecognized
• Warning signs can include chest discomfort, shortness of breath, fatigue, nausea, or arm/jaw/back pain
• Managing risk factors like high blood pressure, cholesterol, and diabetes can lower risk

What are interesting facts about heart disease? 

One of the most interesting facts about heart disease is that it often begins decades before symptoms appear. That also means there’s a real window of opportunity to be proactive. That’s exactly why I created Optimize, a program that breaks down the underlying drivers of plaque formation and how to address each one through science based nutrition.

Why is heart disease so common? 

Heart disease is common because there are many risk factors that develop silently over time. These include high blood pressure, elevated LDL cholesterol, insulin resistance, chronic stress, and more. 

When we don’t feel it, we often don’t realize anything needs to change, and so it silently brews until an event occurs. That’s why knowing your numbers is so important. It’s the first step toward taking empowered, informed action.

Why is heart disease important? 

Heart disease is important because it’s the leading cause of death globally. Understanding the risk factors and taking steps to prevent them can reduce the risk of major cardiovascular events. 

In fact, research suggests that up to 80%-90% of heart disease may be preventable through evidence based nutrition and lifestyle changes. 

Whether you’re looking for the support of a group program or prefer a more personalized one on one approach, I’m here to help you take the next step toward better heart health.

References

1. World Health Organization. (2025, July 31). Cardiovascular diseases (CVDs). https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-%28cvds%29
2. Wadhera, R. K., Dhruva, S. S., Bikdeli, B., Bonaca, M. P., Kittleson, M. M., Ko, D. T., Lu, Y., Pagidipati, N. J., Sawano, M., Spatz, E. S., Vaduganathan, M., Wasfy, J. H., Yong, C. M., Yang, H., Zheng, Z., Krumholz, H. M., & Curtis, L. H. (2026). Cardiovascular Statistics in the United States, 2026: JACC Stats. Journal of the American College of Cardiology, 87(9), 1094–1134. https://doi.org/10.1016/j.jacc.2025.12.027
3. Palaniappan, L. P., Allen, N. B., Almarzooq, Z. I., Anderson, C. A. M., Arora, P., Avery, C. L., Baker-Smith, C. M., Bansal, N., Currie, M. E., Earlie, R. S., Fan, W., Fetterman, J. L., Barone Gibbs, B., Heard, D. G., Hiremath, S., Hong, H., Hyacinth, H. I., Ibeh, C., Jiang, T., Johansen, M. C., … American Heart Association Council on Epidemiology and Prevention Statistics Committee and Stroke Statistics Committee (2026). 2026 Heart Disease and Stroke Statistics: A Report of US and Global Data From the American Heart Association. Circulation, 153(9), e275–e906. https://doi.org/10.1161/CIR.0000000000001412
4. Tsao, C. W., Aday, A. W., Almarzooq, Z. I., Anderson, C. A. M., Arora, P., Avery, C. L., Baker-Smith, C. M., Beaton, A. Z., Boehme, A. K., Buxton, A. E., Commodore-Mensah, Y., Elkind, M. S. V., Evenson, K. R., Eze-Nliam, C., Fugar, S., Generoso, G., Heard, D. G., Hiremath, S., Ho, J. E., Kalani, R., … American Heart Association Council on Epidemiology and Prevention Statistics Committee and Stroke Statistics Subcommittee (2023). Heart Disease and Stroke Statistics-2023 Update: A Report From the American Heart Association. Circulation, 147(8), e93–e621. https://doi.org/10.1161/CIR.0000000000001123
5. Keteepe-Arachi, T., & Sharma, S. (2017). Cardiovascular Disease in Women: Understanding Symptoms and Risk Factors. European cardiology, 12(1), 10–13. https://doi.org/10.15420/ecr.2016:32:1
6. Razavi, A. C., Whelton, S. P., Blumenthal, R. S., Sperling, L. S., Blaha, M. J., & Dzaye, O. (2023). Coronary artery calcium and sudden cardiac death: current evidence and future directions. Current opinion in cardiology, 38(6), 509–514. https://doi.org/10.1097/HCO.0000000000001081
7. Pelc, C. (2025, September 29). 99% of heart attack, stroke, heart failure cases linked to preventable risk factors. Medical News Today. https://www.medicalnewstoday.com/articles/heart-attack-stroke-heart-failure-linked-to-preventable-risk-factors
8. National Lipid Association. (2026, March 3). National Lipid Association highlights new meta-analysis supporting LDL-C lowering in primary prevention. https://www.lipid.org/nla/national-lipid-association-highlights-new-meta-analysis-supporting-ldl-c-lowering-primary
9. Khera, A. V., Emdin, C. A., Drake, I., Natarajan, P., Bick, A. G., Cook, N. R., Chasman, D. I., Baber, U., Mehran, R., Rader, D. J., Fuster, V., Boerwinkle, E., Melander, O., Orho-Melander, M., Ridker, P. M., & Kathiresan, S. (2016). Genetic risk, adherence to a healthy lifestyle, and coronary disease. New England Journal of Medicine, 375(24), 2349–2358. https://doi.org/10.1056/NEJMoa1605086
10. American Heart Association. (2024, January 24). More than half of U.S. adults don’t know heart disease is leading cause of death, despite 100-year reign. https://newsroom.heart.org/news/more-than-half-of-u-s-adults-dont-know-heart-disease-is-leading-cause-of-death-despite-100-year-reign
11. Steg, P. G., Szarek, M., Jukema, J. W., Bhatt, D. L., Bittner, V. A., Diaz, R., Fazio, S., et al. (2025). Relation of low-density lipoprotein cholesterol, high-sensitivity C-reactive protein, and lipoprotein(a) each to future cardiovascular events and death after acute coronary syndrome on high-intensity statin therapy: An analysis of the placebo arm of ODYSSEY OUTCOMES. Circulation, 151(14). https://doi.org/10.1161/CIRCULATIONAHA.124.071269