Yes, you can feel fine and still have heart disease. Plaque builds in the artery walls for years without causing pain, breathlessness or any other signal. For some people the first sign is a heart attack.
That is not a reason for alarm. It is a reason to know your risk before symptoms appear, and to understand what the available tests can and cannot show.
Key takeaways
- Plaque can build for years with no symptoms, and for some people a heart attack is the first sign.
- Silent heart attacks are common and are not harmless.
- Silent disease is more likely with diabetes, older age, male sex, high blood pressure, excess weight or a smoking history.
- Each test sees only part of the picture, and scans are most useful when the result would change a decision.
- Symptoms that come on suddenly or do not settle mean calling 911.
Why heart disease can stay silent for years
Symptoms such as chest tightness on exertion come from reduced blood flow. Plaque usually has to narrow an artery a great deal before flow drops enough for you to notice.
Until then the artery adapts. Its wall often expands outward as plaque grows, which keeps the channel open. You can exercise, pass a physical and have a normal resting ECG while this is going on. Our guide to how arterial plaque builds up explains the process.
Heart attacks often come from a plaque that tears and triggers a clot, and the plaque that tears is not always one that was narrowing the artery much. So a person can go from no symptoms to a heart attack with little in between.
Silent heart attacks are common
A silent heart attack is one that happens without being recognized at the time. The person may have felt nothing, or had symptoms mild enough to blame on indigestion, a pulled muscle or a bad night. It is discovered later, on an ECG or a heart scan.
These are not rare. In the ARIC study, which followed 9,498 adults without heart disease for about nine years, silent heart attacks made up about 45% of all the heart attacks that occurred.1 They were not harmless either: people who had one were about three times as likely to die later of coronary heart disease as people with no heart attack.
Imaging finds even more. In the MESA study, heart MRI found scarring in the heart muscle in 7.9% of 1,840 adults with an average age of 68, and 78% of those scars had not been picked up by an ECG or a clinical evaluation.2
Who is more likely to have silent disease
Silent disease can affect anyone with risk factors, but some groups stand out.
- People with diabetes. In the DIAD study, 22% of adults aged 50 to 75 with type 2 diabetes and no heart symptoms had reduced blood flow or related abnormalities on a stress imaging test.3 Signs of nerve dysfunction were a strong predictor, which fits the idea that diabetes can blunt warning pain.
- Older adults and men. In MESA, hidden heart scars were more common with older age and in men.
- People with high blood pressure, excess weight or a smoking history. A 2024 meta-analysis of 14 cohort studies found that people with an unrecognized heart attack were more likely to have diabetes and high blood pressure than people with no heart attack.4
Women are not exempt. Symptoms other than classic chest pain are more likely to be overlooked, which we cover in heart attack warning signs in women.
Signs that are easy to dismiss
Silent does not always mean no symptoms at all. Sometimes the signs are there and get explained away:
- Getting winded on stairs or hills that used to be easy
- Unusual tiredness that lasts for days
- Pressure, burning or discomfort in the chest, upper belly, jaw, neck, back or arm
- Nausea, cold sweat or lightheadedness without a clear cause
If symptoms like these come on suddenly or do not settle, call 911. Do not drive yourself and do not wait to see if they pass.
How silent disease can be detected, and the limits
No single test finds all hidden heart disease. Each answers a different question.
| Test | What it can show | Main limit |
|---|---|---|
| Risk calculator | Your estimated chance of a heart event over 10 years | An average for people like you. It does not look at your arteries. |
| Blood tests such as ApoB and Lp(a) | How strong the forces building plaque are | They do not show whether plaque is present. |
| Coronary calcium (CAC) score | Calcified plaque in the heart arteries | Cannot see soft plaque. Involves a small dose of radiation. |
| Resting ECG | Heart rhythm and signs of a past heart attack | Often normal even when plaque is present. |
| Stress test | Whether a blockage limits blood flow under effort | Can be normal when plaque is present but not yet limiting flow. |
More testing is not always better. The US Preventive Services Task Force recommends against screening with a resting or exercise ECG in adults without symptoms who are at low risk.5 Its reasoning is that the result is unlikely to change care and can lead to further invasive tests.
The same group looked at adding newer markers to standard risk assessment. It concluded that the evidence was insufficient to judge the benefits and harms of adding a calcium score, hs-CRP or ankle-brachial index for adults without symptoms.6 That does not mean these tests are useless. It means they are best used when the result would change a decision, such as whether to start treatment.
What actually lowers the risk
You cannot feel your way to an answer, so the practical approach is to measure what drives plaque and act on it. That means knowing your blood pressure, cholesterol particles, blood sugar and family history, not smoking, and staying active.
Your next step: find out your own risk
Start with our guide to the coronary calcium score, the most direct common test for plaque in people without symptoms, and to the heart disease risk assessment, which shows how the pieces fit together.
You can also answer the three quick questions in the Cardio Res-Q screener on our program page. Cardio Res-Q is a prevention program, not emergency care. If you have symptoms now, call 911.
Are You a Candidate for Cardio Res-Q?
Three quick questions about the risk factors we screen for. Your answers stay between you and the clinic.
Frequently asked questions
Can a routine physical find silent heart disease?
Only partly. A physical checks blood pressure, cholesterol and blood sugar, which tell you about risk. It does not look at your arteries. A resting ECG can show a past heart attack, but it is often normal in people who have plaque.
How would I know if I had a silent heart attack?
Usually you would not know at the time. Silent heart attacks are found later, when an ECG or heart imaging shows signs of damage. If you look back and remember an episode of unexplained breathlessness, sweating or chest discomfort, mention it to your clinician.
Is a silent heart attack less serious than a regular one?
No. In the ARIC study, people who had a silent heart attack had a higher risk of later dying from heart disease than people with no heart attack. Because it goes unrecognized, it also goes untreated, which is part of the problem.
Should everyone get a heart scan just in case?
No. Scans are most useful when the result would change what you do, for example in adults at borderline or intermediate risk who are unsure about treatment. For low-risk adults without symptoms, expert panels have not found enough evidence that extra screening improves outcomes.
Related reading
This article is for general education and is not medical advice. Decisions about testing and medication should be made with your clinician. If you have chest pain or other symptoms of a heart attack, call 911.
