Most clogged arteries cause no signs at all until the narrowing is advanced or a plaque suddenly tears. When signs do appear, the common ones are chest pressure or tightness with effort, leg pain when walking that eases with rest, brief stroke-like episodes, and, in men, erectile dysfunction.
Waiting for a symptom is not a reliable way to find plaque. Some signs are emergencies, so start with the list below, then read on for the slower signs and the tests that find plaque early.
Call 911 now if
- You have pressure, squeezing, fullness or pain in the center of the chest that lasts more than a few minutes, or goes away and comes back.
- You have discomfort in one or both arms, the back, neck, jaw or stomach, shortness of breath, a cold sweat, nausea or lightheadedness, with or without chest discomfort.
- One side of the face droops, one arm is weak or drifts down, or speech is slurred or hard to understand.
- You have sudden numbness or weakness on one side, sudden confusion, trouble seeing, trouble walking or loss of balance, or a sudden severe headache with no known cause.
- Symptoms like these go away after a few minutes. Call anyway, and do not drive yourself.
Key takeaways
- Plaque usually grows for years without any symptom, because the artery widens to make room for it.
- Chest discomfort on exertion and leg pain on walking are late signs of narrowing, not early ones.
- A brief stroke-like episode that clears up is a warning of a possible stroke and needs urgent care.
- Erectile dysfunction can be an early sign of artery disease and is worth raising with a doctor.
- Scans such as a calcium score can find plaque before symptoms, and they help most when the result would change a decision.
Why most clogged arteries cause no symptoms
Plaque is not sludge in a pipe. It builds inside the artery wall from cholesterol-carrying particles, immune cells and, later, calcium. Our guide to what arterial plaque is explains how it forms.
As plaque grows, the artery usually expands outward to keep the channel open. In a classic autopsy study of 136 hearts, the open channel of the main left coronary artery did not shrink until plaque took up about 40% of the vessel's area.1 Blood flow is normal for a long time, so you feel nothing.
Many heart attacks also come from a plaque that tears and triggers a clot without much narrowing beforehand, so some people get no warning at all. Our article on silent heart disease looks at how common this is.
Late sign 1: chest discomfort with effort
When a heart artery is narrowed enough, the heart muscle gets too little blood during exertion. The result is angina: pressure, tightness, squeezing or heaviness in the chest that comes on with activity or stress and eases with rest. It can spread to the arm, neck, jaw or back, or show up mainly as shortness of breath.
Predictable angina needs a prompt medical visit. Chest discomfort that is new, at rest, stronger than usual or lasting more than a few minutes is an emergency. Women more often have symptoms other than classic chest pain, which we cover in heart attack warning signs in women.
Late sign 2: leg pain when you walk
Plaque in the leg arteries is called peripheral artery disease. Its textbook sign is claudication: cramping, aching or tiredness in the calf, thigh or buttock that comes on with walking and goes away within minutes of rest.
Most people with it never have that textbook pattern. In a US study that checked 6,979 primary care patients with an ankle-brachial index test, classic claudication was distinctly uncommon, found in only 11% of those with peripheral artery disease.2 Many people with it have atypical leg symptoms or none. Plaque in the legs often means plaque elsewhere too.
Late sign 3: a mini-stroke that clears up
A transient ischemic attack, or TIA, is a brief episode of stroke-like symptoms, such as one-sided weakness, slurred speech or loss of vision, that resolves. Plaque in the neck arteries is one possible cause.
An American Heart Association scientific statement describes people who have had a TIA as being at high risk of early stroke and advises brain imaging within 24 hours of symptoms.3 Call 911.
Stroke signs are not limited to the face, arm and speech. In one stroke center's records, 14% of people with an ischemic stroke had none of those three signs on arrival, and adding balance and vision problems cut the share missed to about 4%.4
An early vascular sign: erectile dysfunction
Erections depend on healthy blood vessels, and erectile dysfunction can be one of the first signs that blood flow is affected, sometimes before any heart symptom.
A meta-analysis of 12 prospective studies with 36,744 men found that those with erectile dysfunction had a 48% higher risk of cardiovascular disease and a 46% higher risk of coronary heart disease.5 If you have erectile dysfunction, ask for a heart risk check as well as treatment. Our page on erectile dysfunction has more.
Tests that find plaque before symptoms
Since most plaque is silent, the way to find it early is to look for it.
| Test | What it shows | Main limit |
|---|---|---|
| Coronary calcium (CAC) score | Calcified plaque in the heart arteries | Does not see soft plaque; small radiation dose |
| Carotid ultrasound (CIMT and plaque) | Wall thickness and plaque in the neck arteries | An indirect clue about the heart |
| Ankle-brachial index | Reduced blood flow to the legs | Finds narrowing, not early plaque |
The coronary calcium score is the most direct common test for heart plaque in people without symptoms. A CIMT ultrasound looks at the neck arteries. US guidance from 2013 does not recommend routine CIMT measurement for predicting a first heart attack or stroke, and finding carotid plaque predicts better than wall thickness alone.
The US Preventive Services Task Force found the evidence insufficient to weigh the benefits and harms of adding a calcium score, ankle-brachial index or hs-CRP to standard risk assessment in adults without symptoms.6 They help most when the result would change a decision.
Your next step: check your risk before symptoms
If you have any of the emergency signs above, call 911. Cardio Res-Q is a prevention program, not emergency care.
If you feel well but want to know where you stand, read our guide to the calcium score and the ApoB test, then answer the three quick questions in the Cardio Res-Q screener on our program page.
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 you feel your arteries clogging?
No. Plaque builds inside the artery wall without pain, and the artery widens to keep blood flowing. You only notice it when narrowing limits flow during effort, or when a plaque tears and causes a heart attack or stroke.
Do normal blood tests mean my arteries are clear?
Not necessarily. A standard cholesterol panel shows risk, not plaque. People can have plaque with normal cholesterol, especially with high Lp(a), diabetes, smoking or a strong family history.
Is tiredness a sign of clogged arteries?
It can be, especially new tiredness or breathlessness with activity that used to be easy, and especially in women and people with diabetes. Tiredness has many causes, so mention it to your doctor, and call 911 if it comes with chest discomfort or other warning signs.
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.
