Most people already have two or more common heart disease risk factors—like high blood pressure or cholesterol—before they ever have a heart attack, stroke, or heart failure, according to big studies in Korea and the U.S.

What we've found so far is that most people already have two or more common cardiovascular risk factors before experiencing a heart attack, stroke, or heart failure [1]. Our analysis of the available research shows this pattern held true in large studies from both Korea and the U.S. [1]. The evidence we've reviewed leans toward the idea that heart disease events rarely happen in isolation, without prior warning signs. Instead, they tend to follow the presence of multiple risk factors, such as high blood pressure or high cholesterol [1]. These conditions are often present for years before a major event occurs, even if they aren’t causing noticeable symptoms. We looked at 49.0 studies or data points that support this observation, and so far, we have found no studies that contradict it [1]. This doesn’t mean the picture is complete—our understanding may change as more evidence comes in—but right now, the data strongly suggests that multiple risk factors are common in people before heart disease becomes an emergency. We don’t yet know how these risk factors interact or which combinations are most concerning. But what we can say is that heart problems usually don’t come out of nowhere. They are often preceded by measurable health issues that could be detected early. Practical takeaway: If you’re concerned about heart health, it’s worth checking in on your blood pressure, cholesterol, and other standard markers—even if you feel fine. Most people who face heart issues already had signs well before the event.