Aspirin & Your Heart: Friend or Foe for Daily Use?
By Dr Nabila Laskar — published August 2026.
Aspirin has long been associated with heart health, but its role in daily prevention is changing. Dr Nabila Laskar clarifies when it's beneficial and when it might do more harm than good.
Understanding Aspirin's Role in Heart Health
For decades, many people routinely took a daily aspirin, believing it was a simple way to protect their hearts. You might even know someone who still does. As a consultant cardiologist, I often get asked whether a daily aspirin is a good idea. The truth is, the advice has evolved significantly, thanks to robust new research.
Aspirin, or acetylsalicylic acid, works as an antiplatelet agent. This means it helps prevent your blood platelets from clumping together to form clots. Clots can block arteries, leading to heart attacks or strokes. This clot-preventing property is why aspirin has been a cornerstone in treating acute cardiovascular events.
However, this very benefit comes with a significant risk: bleeding. This delicate balance between preventing clots and causing bleeding is central to deciding if aspirin is right for you.
Key facts:
- • Aspirin prevents blood clots, reducing risk of heart attacks and strokes.
- • Its use for primary prevention (in people without known heart disease) is now more limited due to bleeding risks.
- • Always consult your doctor before starting or stopping daily aspirin.
Who Benefits Most from Daily Aspirin?
The decision to take daily aspirin is highly individualised and depends on your personal cardiovascular risk profile. Broadly, we divide patients into two categories when considering aspirin therapy.
Secondary Prevention
- • If you've already had a heart attack.
- • If you've suffered an ischaemic stroke or a transient ischaemic attack (TIA).
- • If you've undergone procedures like a coronary stent insertion or bypass surgery.
- • If you have established peripheral arterial disease.
- • In these cases, your risk of a future cardiovascular event is high, and the benefits of aspirin usually outweigh the risks of bleeding.
Primary Prevention
- • If you have not yet experienced a heart attack or stroke.
- • For this group, the evidence has shifted. Routine daily aspirin for primary prevention is generally no longer recommended for most adults.
- • Exceptions might include certain individuals with a very high calculated cardiovascular risk but a very low bleeding risk, following a detailed discussion with their doctor.
The Risks: Why Not Everyone Should Take Aspirin
While aspirin can be a lifesaver for some, it's not without its dangers, particularly when taken unnecessarily. The main concern is bleeding, which can range from mild to life-threatening.
The most common side effects include stomach upset, indigestion, and heartburn. More seriously, aspirin can lead to gastrointestinal bleeding, where you might experience blood in your stool or vomit. In rare but severe cases, it can cause bleeding in the brain (haemorrhagic stroke), which can have devastating consequences.
Your doctor will consider several factors when assessing your bleeding risk, such as your age, history of stomach ulcers, use of other medications (like blood thinners or NSAIDs), and kidney function.
What is 'low-dose' aspirin?
Typically, 75mg daily in the UK, sometimes 81mg in other countries. This is much lower than the doses used for pain relief or fever.
Can I just stop taking aspirin if I've been on it for years?
No, never stop aspirin without consulting your doctor. If you've been taking it for secondary prevention (e.g., after a heart attack), suddenly stopping can significantly increase your risk of another event. Your doctor will advise on the safest way forward.
Making the Decision: A Step-by-Step Approach
Deciding on daily aspirin isn't something to take lightly. It requires a careful evaluation of your individual health profile and a thorough discussion with your healthcare professional. Here's how we approach it:
1. Assess Your Current Heart Health
Your doctor will review your medical history, looking for previous heart attacks, strokes, stents, or other cardiovascular conditions. This determines if you fall into the secondary prevention group.
2. Calculate Your Cardiovascular Risk
If you haven't had a heart event, your doctor will use various risk calculators (e.g., QRISK3 in the UK) to estimate your 10-year risk of developing heart disease. Factors like age, cholesterol, blood pressure, diabetes, smoking status, and family history are all considered.
3. Evaluate Your Bleeding Risk
Simultaneously, your doctor will assess factors that increase your risk of bleeding, such as age, kidney disease, stomach ulcers, uncontrolled high blood pressure, and other medications you might be taking (especially other blood thinners or anti-inflammatory drugs).
4. Discuss the Pros and Cons
With all this information, your doctor will have an in-depth conversation with you, explaining the potential benefits of aspirin in preventing future events versus the specific risks you face from bleeding. This shared decision-making is crucial.
5. Consider Alternatives for Primary Prevention
If daily aspirin isn't recommended for primary prevention, your doctor will focus on other, often more effective, strategies. This includes lifestyle modifications, managing blood pressure and cholesterol, and treating diabetes – all proven ways to significantly reduce your cardiovascular risk without the bleeding concerns.
Lifestyle: Your First Line of Defence
It's important to remember that for most people, particularly those without established cardiovascular disease, lifestyle modifications remain the most powerful tools for preventing heart attacks and strokes. These strategies carry no risk of bleeding and offer a wealth of other health benefits.
This includes adopting a heart-healthy diet rich in fruits, vegetables, and whole grains, maintaining a healthy weight, getting regular physical activity, managing stress, and, crucially, avoiding smoking. These measures can effectively lower your blood pressure, improve your cholesterol levels, and reduce your overall cardiovascular risk profile, often more effectively than aspirin for primary prevention.
When to Speak to Your Doctor
Don't make assumptions about aspirin. If you are currently taking daily aspirin or are considering starting it, please:
- • **Do not self-prescribe.** Aspirin is a medicine with significant risks.
- • **Do not stop taking aspirin suddenly** if you have been advised to take it for secondary prevention (e.g., after a heart attack or stroke). This can be dangerous.
- • **Discuss your individual situation** with your GP or cardiologist. They will consider your full medical history, risk factors, and other medications to determine if daily aspirin is appropriate and safe for you.
- • **Focus on lifestyle.** For many, the best 'heart protection' comes from healthy living, not a pill.