Why doctors are rethinking daily aspirin for heart health

For years, a daily low-dose aspirin was seen as a simple and effective way to reduce the risk of heart attacks and strokes. Millions of Americans adopted the habit, often without a second thought. But new research and updated medical guidelines are prompting many doctors to reconsider this once-standard recommendation.

Recent studies show that the risks of daily aspirin — particularly internal bleeding — may outweigh the benefits for many people, especially older adults. As a result, medical experts are rethinking who should be taking aspirin, and under what circumstances.

How aspirin became a heart health staple

Aspirin works by thinning the blood and preventing the formation of clots that can block arteries. Decades ago, this mechanism made it a promising option for people at risk of cardiovascular disease. Early trials suggested that it reduced the incidence of heart attacks in certain populations, especially those with known heart conditions.

As a result, low-dose aspirin — typically 81 mg per day — became widely recommended not only for those who had already suffered a heart attack or stroke (known as secondary prevention), but also for healthy individuals over 50 as a form of primary prevention.

What the new research reveals

Over the past decade, a wave of large, rigorous studies has complicated this narrative. Several trials — including ASPREE, ARRIVE, and ASCEND — have shown that for people without a history of heart disease, the benefits of daily aspirin are small, while the risks of gastrointestinal and brain bleeding are more significant than previously thought.

This shift in evidence prompted the U.S. Preventive Services Task Force (USPSTF) to revise its guidelines in 2022. The new recommendations advise against initiating low-dose aspirin for adults aged 60 and older for primary prevention. For people between 40 and 59, the decision should be made on an individual basis after consulting a healthcare provider.

The balance of benefit versus risk

While aspirin does reduce the risk of heart attack and stroke, it also increases the risk of bleeding — especially in the stomach and brain. For individuals with a low or moderate risk of cardiovascular events, this trade-off may not be worthwhile. In fact, for many, the risks now appear to outweigh the rewards.

As doctors weigh new evidence, they’re focusing more on individualized risk assessment rather than blanket recommendations. That includes evaluating a person’s age, blood pressure, cholesterol levels, family history, lifestyle, and other health conditions before suggesting aspirin therapy.

Who might still benefit from aspirin?

Daily aspirin is still considered effective for people with a history of cardiovascular events — such as previous heart attacks, strokes, or certain surgical interventions like stent placements. In these cases, the benefit of preventing another event often justifies the bleeding risk.

In some patients with very high risk due to diabetes, plaque buildup, or genetic factors, doctors may still recommend aspirin as part of a comprehensive heart health strategy. But for the general population, its use is being scaled back considerably.

What should patients do now?

If you’re currently taking aspirin daily and do not have a history of cardiovascular disease, it’s essential to speak with your doctor before making any changes. Stopping suddenly without medical advice can be dangerous in certain cases.

Instead, patients should schedule a conversation with their healthcare provider to reassess whether aspirin is appropriate, and to explore alternative strategies for heart health, including:

• Maintaining healthy blood pressure and cholesterol levels
• Eating a heart-healthy diet rich in fruits, vegetables, and whole grains
• Exercising regularly
• Avoiding smoking and excessive alcohol use
• Managing stress and getting adequate sleep

The evolving science of prevention

The aspirin story is a reminder that science evolves — and medical advice evolves with it. What was once a routine daily pill for millions is now a more nuanced decision, requiring careful consideration of individual risk factors and up-to-date evidence.

As research continues to shed light on prevention, patients and doctors alike must stay informed and open to change. Heart health is a long game, and decisions should always be made with the best and most current information available.