Nearly 1 in 5 people having their first major heart attack didn’t have any of the usual risk factors like high blood pressure, diabetes, high cholesterol, or smoking — meaning many heart attacks happen in people doctors wouldn’t have flagged as high-risk.

What we've found so far is that a notable number of people experience their first major heart attack without having traditional risk factors like high blood pressure, diabetes, high cholesterol, or a history of smoking [1]. Our analysis of the available evidence suggests that nearly 1 in 5 individuals in this group were not identified as high-risk based on these common markers [1]. This means that even without what doctors typically consider warning signs, some people still face a significant risk of a first major heart attack. The evidence we've reviewed leans toward the idea that traditional screening methods may miss a portion of at-risk individuals [1]. While most heart attacks are linked to known factors, this finding highlights that other, less understood influences could also play a role. We only have one assertion to draw from so far, supported by data from 53.0 studies, with no studies refuting this point [1]. Still, we recognize that this is just one piece of a larger picture. Our current analysis doesn’t explain what those other factors might be—only that they may exist and matter. Because of this, we can’t assume someone is safe just because they don’t have high cholesterol, high blood pressure, diabetes, or a smoking history. Heart health may depend on factors beyond what’s routinely measured. Practical takeaway: Even if you feel healthy and don’t have known risk factors, paying attention to your body, managing stress, staying active, and talking to your doctor about your overall heart health can still be important.