Atherosclerotic heart disease is a buildup of plaque inside your heart's arteries

Atherosclerotic heart disease happens when fatty deposits called plaque accumulate on the inner walls of the arteries that supply blood to your heart muscle. Over time, this buildup narrows the arteries and hardens, a process called atherosclerosis. When an artery becomes too narrow, your heart muscle doesn't get enough oxygen-rich blood, especially during physical activity or stress. This can cause chest pain, shortness of breath, or a heart attack if an artery becomes completely blocked.

The plaque forms gradually over years or decades. It starts with damage to the inner lining of an artery—often from high blood pressure, smoking, high cholesterol, or diabetes. Your body tries to repair this damage, but the process can go wrong, trapping cholesterol and other substances under the artery's surface. As more material accumulates, the artery stiffens and narrows.

Key Takeaways

  • Atherosclerotic heart disease develops when plaque builds up inside arteries that feed your heart, narrowing them and reducing blood flow.
  • Risk factors include high blood pressure, high cholesterol, smoking, diabetes, obesity, and a family history of heart disease.
  • Doctors diagnose it using blood tests, an EKG (electrocardiogram), stress tests, or imaging like a CT scan or cardiac catheterization.
  • Treatment focuses on slowing plaque growth through medication and lifestyle changes, and preventing blood clots that could trigger a heart attack.
  • Many people have atherosclerosis without symptoms until an artery becomes severely narrowed or blocked.

Risk factors that lead to atherosclerotic heart disease

Certain conditions and habits make atherosclerosis more likely to develop. High blood pressure damages artery walls by forcing blood against them with too much force. High cholesterol—especially LDL cholesterol, the "bad" kind—provides the raw material for plaque. Smoking injures artery linings and makes blood more likely to clot. Diabetes damages blood vessels and speeds up plaque formation.

Other risk factors include obesity, physical inactivity, an unhealthy diet high in saturated fat and salt, and chronic stress. Age matters too: men over 45 and women over 55 face higher risk. If your parents, siblings, or grandparents had heart disease before age 55 (for men) or 65 (for women), your own risk is elevated. Some people are born with genetic conditions that raise cholesterol dramatically, making atherosclerosis develop much earlier in life.

Symptoms you might notice

Many people have no symptoms at all, even with significant plaque buildup. The first sign is sometimes a heart attack. But when symptoms do appear, they usually start with chest pain or pressure, especially during physical activity, emotional stress, or after a heavy meal. This pain—called angina—often feels like squeezing, heaviness, or tightness in the center of the chest. It may spread to your arm, neck, jaw, or back.

Other warning signs include shortness of breath, unusual fatigue, lightheadedness, or nausea. Symptoms may come and go at first. Some people notice them only when climbing stairs or walking uphill. If you experience chest pain that doesn't go away with rest, chest pain accompanied by sweating or shortness of breath, or sudden severe chest pain, call emergency services immediately—these can signal a heart attack in progress.

How doctors diagnose atherosclerotic heart disease

Your doctor will start by asking about your symptoms, family history, and risk factors, then listen to your heart with a stethoscope. Blood tests measure cholesterol levels and other markers of heart health. An EKG (electrocardiogram) records the electrical activity of your heart and can show signs of reduced blood flow or past damage.

If your doctor suspects atherosclerosis, you may have a stress test, where you exercise on a treadmill or stationary bike while your heart rhythm and blood pressure are monitored. This shows whether your heart gets enough blood during activity. A CT scan or coronary calcium scan can reveal plaque in your arteries without needing to insert a catheter. For a clearer picture, cardiac catheterization involves threading a thin tube through an artery to the heart and injecting dye so the doctor can see blockages on X-ray images. This test is more invasive but gives the most detailed view of which arteries are narrowed and by how much.

Treatment options and what to expect

Treatment aims to slow plaque growth, prevent blood clots, and reduce your heart's workload. Medications are a cornerstone: statins lower cholesterol and stabilize plaque, ACE inhibitors or beta-blockers reduce blood pressure and ease strain on your heart, and aspirin or other antiplatelet drugs prevent clots. Your doctor may prescribe several medications together, and finding the right combination sometimes takes time.

Lifestyle changes are equally important. Quitting smoking, eating a heart-healthy diet low in saturated fat and salt, exercising regularly (as your doctor recommends), managing stress, and maintaining a healthy weight all slow atherosclerosis and reduce your risk of a heart attack. If a single artery is severely blocked, your doctor may recommend angioplasty—a procedure to open the artery using a balloon and often a small metal tube called a stent—or bypass surgery, where a healthy blood vessel is grafted to route blood around the blockage.

Living with atherosclerotic heart disease

Once diagnosed, atherosclerotic heart disease requires ongoing management. You'll need regular follow-up appointments to check how well your medications are working and whether your risk factors are under control. Blood pressure and cholesterol checks become routine. Your doctor may repeat imaging tests periodically to see whether the disease is progressing or stabilizing.

Many people live for decades with atherosclerosis, especially if they take medications as prescribed and make lifestyle changes. The goal is not to reverse the plaque—that rarely happens—but to prevent it from growing, keep it stable, and reduce the chance it will rupture and cause a clot. Knowing your warning signs and when to seek emergency care is critical. Keep a list of your medications and your doctor's contact information with you, and tell family members what symptoms to watch for.

Preventing atherosclerotic heart disease

If you don't yet have atherosclerosis, prevention starts with managing the risk factors you can control. Keep your blood pressure below 130/80 mmHg (or the target your doctor sets). Aim for total cholesterol below 200 mg/dL and LDL cholesterol below 100 mg/dL, though your doctor may set different targets based on your overall risk. Don't smoke, and avoid secondhand smoke. Exercise at least 150 minutes per week of moderate activity like brisk walking.

Eat a diet rich in vegetables, fruits, whole grains, lean proteins, and healthy fats from fish and nuts. Limit salt to less than 2,300 mg per day. Maintain a healthy weight—a BMI between 18.5 and 24.9 is the target for most adults. If you have diabetes, keep your blood sugar controlled. If you have a strong family history of early heart disease, talk to your doctor about whether you should start a statin or other preventive medication even if your cholesterol is normal.

Frequently Asked Questions

Can atherosclerotic heart disease go away on its own?

No, plaque does not disappear without treatment. Medications and lifestyle changes can slow its growth and stabilize it, preventing it from rupturing and causing a clot, but the plaque itself remains. In rare cases, very aggressive cholesterol lowering may shrink plaque slightly, but this is not the typical outcome.

Is atherosclerotic heart disease the same as a heart attack?

No. Atherosclerotic heart disease is the underlying condition—the buildup of plaque in your arteries. A heart attack occurs when a piece of plaque ruptures or a blood clot forms and completely blocks an artery, cutting off blood flow to part of the heart muscle. You can have atherosclerosis for years without having a heart attack, but a heart attack usually happens because of atherosclerosis.

What should I do if I have chest pain?

If chest pain lasts more than a few minutes, is severe, or is accompanied by shortness of breath, sweating, or nausea, call emergency services immediately. Do not drive yourself. If you have been diagnosed with atherosclerotic heart disease and have occasional mild chest pain that goes away with rest, tell your doctor at your next appointment, but this is not an emergency.

Will I need surgery if I have atherosclerotic heart disease?

Not necessarily. Many people manage atherosclerosis successfully with medications and lifestyle changes alone. Surgery or angioplasty is recommended when one or more arteries are severely narrowed and causing symptoms that don't improve with medication, or when testing shows a very high risk of heart attack. Your doctor will discuss whether you need a procedure based on your specific situation.

How often should I see my doctor once I'm diagnosed?

This varies depending on how severe your disease is and how well controlled your risk factors are. Most people see their cardiologist or primary care doctor every three to six months initially, then annually once their condition is stable. You'll also need regular blood tests to monitor cholesterol and kidney function, especially if you're taking certain medications.