Heart disease remains one of the leading causes of death around the world, and doctors have long focused on well-known risk factors such as high blood pressure, smoking, and high levels of “bad” cholesterol.
However, scientists are now learning that another type of cholesterol particle may play a powerful role in increasing risk, even in people who appear healthy.
This particle is called Lipoprotein(a), often shortened to Lp(a).
Lp(a) is a special type of fat-carrying particle found in the blood. It is similar to LDL cholesterol, which many people know as “bad” cholesterol, but it has an extra protein attached.
This extra part may make it more harmful because it can increase the chances of blood clots and damage to blood vessels.
Unlike other types of cholesterol, Lp(a) levels are mostly decided by your genes, which means they are passed down through families and are not easy to change with diet or exercise.
A large new analysis has brought fresh attention to this hidden risk. Researchers studied data from more than 20,000 people who took part in three major studies funded by the U.S. National Institutes of Health.
These studies, known as ACCORD, PEACE, and SPRINT, followed adults aged 40 and older over several years to better understand heart health.
The findings were presented at major heart conferences in 2026, including meetings held by leading cardiology groups.
The researchers carefully examined stored blood samples and measured Lp(a) levels using a standardized method.
They then grouped people based on how high their Lp(a) levels were and tracked serious heart-related events such as stroke, heart attack, or death caused by heart problems.
Over nearly four years of follow-up, about 7 percent of participants experienced one of these major events. The results showed that people with very high Lp(a) levels had a clearly higher risk of serious outcomes.
In particular, those with levels above a certain threshold had a greater chance of stroke and death related to heart disease.
Interestingly, the study did not find a strong link between high Lp(a) and heart attacks. This suggests that Lp(a) may affect the body in different ways compared to traditional cholesterol. The increased risk was especially clear in people who already had heart disease, showing that Lp(a) may add extra danger even when other conditions are already present.
One important message from this study is that many people may not know they have high Lp(a). It does not cause clear symptoms, and routine cholesterol tests often do not include it. Yet about one in five people may have higher levels, which means millions could be at risk without knowing it.
Doctors say that a simple blood test can measure Lp(a) levels. This test is not expensive and can provide useful information about a person’s long-term heart risk. If high levels are found, doctors may recommend stronger steps to reduce other risks, such as lowering LDL cholesterol, managing blood pressure, and improving lifestyle habits.
The study also highlights how medical research is evolving. By reusing samples from earlier clinical trials, scientists can uncover new patterns and better understand diseases. The researchers plan to continue studying Lp(a) in different groups, including people with kidney disease and other health conditions.
While this research brings important insights, it also has some limits. The study looked at stored samples and past data, which means it cannot fully prove cause and effect.
In addition, most participants were older adults, so the findings may not apply equally to younger people. There is also still no widely available treatment that directly lowers Lp(a), although new drugs are being developed.
Overall, this study adds to growing evidence that Lp(a) is an important but often overlooked risk factor for heart disease. It shows that even when traditional cholesterol levels are controlled, some people may still face hidden risks.
In the future, testing for Lp(a) could become a routine part of heart health checks, helping doctors provide more personalized care and better protect patients from serious events.
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