Heart disease is the first leading cause of death both globally and in the United States. Worldwide, it kills roughly 9 million people every year, accounting for 13% of all deaths. In the U.S. alone, heart disease claimed 683,491 lives in 2024, more than any other single condition.
Global and U.S. Numbers
The World Health Organization identifies ischemic heart disease as the world’s biggest killer. Since 2000, annual deaths from the disease have risen by 2.7 million, reaching 9 million in 2021. That upward trend reflects aging populations, rising obesity rates, and expanding access to diagnosis in countries that previously undercounted cardiovascular deaths.
In the United States, heart disease has held the number-one spot for decades. The CDC’s 2024 mortality data shows 683,491 deaths from heart disease, representing 22.2% of all registered deaths that year. Cancer, the second leading cause, trailed at 613,352. After that, the list drops sharply: unintentional injuries (222,698), stroke (162,639), and chronic lower respiratory diseases (145,357) round out the top five.
What Actually Happens in Heart Disease
Most heart disease deaths involve a process called ischemia, which simply means the heart muscle isn’t getting enough blood. Over years or decades, fatty deposits called plaques build up inside the coronary arteries, the blood vessels that feed the heart. These plaques narrow the arteries and restrict flow. The real danger comes when a plaque becomes inflamed and ruptures. That triggers a blood clot that can block the artery entirely, cutting off oxygen to part of the heart muscle. If blood flow isn’t restored quickly, that section of muscle dies. This is a heart attack.
Not all heart disease deaths are sudden. Chronic reduced blood flow can weaken the heart over time, leading to heart failure, where the heart can no longer pump effectively. Irregular heart rhythms triggered by damaged tissue can also be fatal. But the underlying driver in most cases is the same: plaque buildup in the arteries supplying the heart.
Who Is Most at Risk
Heart disease doesn’t strike evenly across age groups. For younger adults, accidents and cancer are more common killers. Heart disease first overtakes other causes around ages 45 to 54. In that age bracket, the death rate from heart disease is about 85 per 100,000, slightly higher than cancer (82.5) and accidents (77.2). From there, the gap widens dramatically with each decade. By age 85, heart disease dominates mortality statistics.
Men face a significantly higher risk than women. After adjusting for age, race, income, smoking, and other health conditions, men are roughly 60% more likely to die from cardiovascular disease than women. Estrogen appears to offer women some biological protection, particularly before menopause. Behavioral differences matter too: men are more likely to smoke and drink heavily, both of which accelerate artery damage. Interestingly, uric acid levels, a marker linked to gout and kidney function, appear to explain a meaningful portion of the mortality gap between men and women.
The Financial Toll
Heart disease doesn’t just shorten lives. It drains earning power. People with heart disease earn roughly $13,500 less per year than people without it, a gap of about 25% of average income. Scaled across the entire U.S. population, heart disease caused an estimated $203.3 billion in lost income in 2018. That figure actually exceeds the $119.9 billion lost from premature death itself, meaning the economic burden on people living with heart disease is larger than the cost of lives cut short. Add direct healthcare costs like hospital stays and medications, and the total economic impact is staggering.
Reducing Your Risk
Heart disease is largely preventable. The major risk factors, including high blood pressure, high cholesterol, smoking, physical inactivity, poor diet, and diabetes, are all modifiable. That means the number-one killer worldwide responds to changes people can actually make.
The most impactful steps are straightforward. A diet high in fiber and low in saturated fat helps keep cholesterol in check. Limiting sodium lowers blood pressure. Cutting back on added sugar helps prevent or manage diabetes. Reducing alcohol intake protects both the heart and blood pressure. The U.S. Surgeon General recommends 2 hours and 30 minutes of moderate-intensity exercise per week, roughly 30 minutes of brisk walking five days a week.
Screening matters too. Cholesterol should be tested at least every four to six years in adults, and blood pressure should be checked at least annually. These numbers can be abnormal for years without causing symptoms, which is why heart disease is sometimes called a silent killer. Many people don’t know they’re at risk until they have a heart attack. Catching high blood pressure or cholesterol early gives you years to course-correct before real damage is done.