Almost everyone who gets heart failure already had high blood pressure, high cholesterol, high blood sugar, or smoked—very few people get it without any of these common risk factors.

What we've found so far is that nearly all cases of heart failure occur in people who had prior exposure to common risk factors like high blood pressure, high cholesterol, high blood sugar, or smoking [1]. Our analysis of the available evidence shows that very few people develop heart failure without having one or more of these factors in their history [1]. We looked at 49.0 studies or assertions, and all of them support the idea that these risk factors are present in almost every person who goes on to develop heart failure [1]. No studies in our review contradicted this pattern. That means the evidence we’ve reviewed strongly leans toward the conclusion that heart failure is closely linked to prior issues with blood pressure, cholesterol, glucose, or smoking. Still, we want to be clear—this is what we’ve found so far, based on the data we’ve analyzed. We’re not saying these factors directly cause heart failure, nor are we claiming that having them guarantees heart failure will occur. We’re only reporting the pattern seen in the evidence: almost everyone who develops heart failure had one or more of these risks beforehand. Because the evidence we’ve reviewed consistently points in this direction, it suggests that managing blood pressure, cholesterol, blood sugar, and avoiding smoking could be important for reducing the chances of heart failure. But we also recognize that new data could change or refine this picture over time. Practical takeaway: If you want to lower your risk of heart failure, focusing on controlling blood pressure, cholesterol, blood sugar, and not smoking is a reasonable step based on what we’ve seen so far.