What Is Coronary Artery Disease? Causes, Risk Factors & Treatment

Coronary artery disease (CAD), also called coronary heart disease, is the most common type of heart disease and the leading cause of death for both men and women in the United States. It develops when the arteries that supply blood to the heart muscle become narrowed or blocked. The encouraging news is that much of what drives CAD is preventable and treatable, especially when it’s caught early. This guide explains what coronary artery disease is, how it develops, who is most at risk, and the modern treatments that help people live longer, fuller lives.

What is coronary artery disease?

Your heart is a muscle, and like any muscle it needs a steady supply of oxygen-rich blood to work. That blood is delivered by the coronary arteries, the network of vessels wrapped around the heart. Coronary artery disease occurs when these arteries become narrowed or stiff because of a buildup of fatty deposits called plaque on their inner walls.

When the heart muscle can’t get enough blood, it can cause chest pain or pressure (angina), shortness of breath, and, if a vessel becomes completely blocked, a heart attack. CAD usually develops slowly over many years, which is why awareness and prevention matter so much.

How does coronary artery disease develop?

The underlying process is called atherosclerosis – the gradual buildup of cholesterol, fat, calcium, and other substances inside the artery wall. Over time this plaque hardens and narrows the artery, reducing blood flow. When the heart needs more oxygen, such as during exercise or stress, the narrowed artery can’t keep up, and you may feel chest discomfort.

The more dangerous event happens when a plaque ruptures. The body treats the rupture like an injury and forms a blood clot at the site. If that clot blocks the artery, blood flow stops abruptly and part of the heart muscle begins to die – this is a heart attack (myocardial infarction). A related condition, coronary microvascular disease, affects the heart’s smallest vessels and is more common in women; it can cause symptoms even when the large arteries look relatively clear.

What are the risk factors for coronary artery disease?

Risk factors fall into two groups: those you can’t change and those you can influence through treatment and lifestyle.

Risk factors you can’t change

• Age – risk rises as arteries accumulate more wear over time.
• Family history – especially heart disease in a parent or sibling at an early age.
• Sex – men are generally at higher risk earlier; a woman’s risk rises after menopause.

Risk factors you can manage

• High blood pressure
• High LDL (“bad”) cholesterol
• Smoking and tobacco use
• Diabetes and insulin resistance
• Overweight and obesity
• Physical inactivity and an unhealthy diet
• Chronic, unmanaged stress

Because these factors compound one another, addressing several at once delivers the biggest benefit.

What are the symptoms of coronary artery disease?

The classic symptom is angina – chest pressure, tightness, or squeezing that often comes on with exertion and eases with rest. Pain may radiate to the shoulder, arm, neck, jaw, or back, and may be accompanied by shortness of breath.

Importantly, CAD can be “silent,” causing no symptoms until a heart attack occurs. Women, older adults, and people with diabetes are more likely to have atypical symptoms such as unusual fatigue, nausea, indigestion-like discomfort, lightheadedness, or jaw and back pain – sometimes without obvious chest pain. These differences can delay diagnosis, so it’s important to take any new, unexplained symptoms seriously.

How is coronary artery disease diagnosed?

Diagnosis starts with your history, a physical exam, and blood tests, then uses targeted testing. At MVM, our advanced cardiovascular and vascular diagnostics include several of the tools below:

• Electrocardiogram (ECG/EKG) – records the heart’s electrical activity.
• Echocardiogram – ultrasound that shows how well the heart pumps.
• Stress testing (including nuclear stress testing) – checks how the heart performs under exertion.
• Coronary CT angiography and coronary calcium scoring – imaging that detects narrowing and calcified plaque.
• Cardiac catheterization (coronary angiogram) – the gold-standard test that directly visualizes blockages and can treat them in the same session.

How is coronary artery disease treated?

Treatment is tailored to the severity of disease and combines lifestyle changes, medication, and, when needed, procedures to restore blood flow. The goals are to relieve symptoms, slow disease progression, and prevent heart attacks.

Lifestyle – the foundation

Quitting smoking, eating a heart-healthy diet, staying physically active, maintaining a healthy weight, and controlling blood pressure, cholesterol, and blood sugar are the foundation of every treatment plan and benefit every patient.

Medications

• Statins to lower LDL cholesterol, often with add-on agents (such as ezetimibe or PCSK9 inhibitors) when more lowering is needed.
• Antiplatelet therapy such as aspirin, sometimes combined with a second agent after a heart attack or stent.
• Beta-blockers, ACE inhibitors or ARBs to protect the heart and control blood pressure.
• Anti-anginal medicines (nitrates, calcium channel blockers) to relieve chest pain.

Procedures to restore blood flow

When blockages are significant, revascularization reopens the artery. MVM offers complex coronary and vascular intervention, including:

• Percutaneous coronary intervention (PCI) with stents – a minimally invasive procedure that opens the artery with a balloon and places a stent, frequently performed through the wrist (radial access) for faster recovery.
• Coronary artery bypass grafting (CABG) – surgery that routes blood around blockages, often recommended for the most complex or extensive disease.

Current national guidelines emphasize lowering LDL cholesterol aggressively, treating all significant blockages, and choosing the procedure that offers each patient the best long-term outcome.

Frequently asked questions about coronary artery disease

Can coronary artery disease be reversed?

CAD generally can’t be fully reversed, but its progression can be slowed and sometimes partially improved. Aggressive risk-factor control – especially lowering cholesterol, quitting smoking, and treating blood pressure and diabetes – can stabilize plaque and dramatically reduce the risk of a heart attack.

Is chest pain always a sign of coronary artery disease?

No. Chest pain has many causes, and some people with CAD have no chest pain at all. Any new, severe, or unexplained chest discomfort – especially with shortness of breath, sweating, or pain spreading to the arm or jaw – should be treated as an emergency. Call 911.

At what age should I start screening for heart disease?

Most adults should know their blood pressure, cholesterol, and blood sugar numbers by their 20s and have them rechecked regularly. People with risk factors or a family history of early heart disease may benefit from earlier, more detailed evaluation – a conversation worth having with a cardiologist.

This article is for general educational purposes and is not a substitute for personalized medical advice. Always consult a qualified healthcare provider about your specific condition.

References

1. American Heart Association. 2025 Heart Disease and Stroke Statistics Update. Circulation. https://www.ahajournals.org/doi/10.1161/CIR.0000000000001303
2. Centers for Disease Control and Prevention. Heart Disease Facts (FastStats). https://www.cdc.gov/nchs/fastats/heart-disease.htm
3. Virani SS, et al. 2023 AHA/ACC Guideline for the Management of Patients With Chronic Coronary Disease. Circulation. https://www.ahajournals.org/doi/10.1161/CIR.0000000000001168
4. Rao SV, et al. 2025 ACC/AHA Guideline for the Management of Patients With Acute Coronary Syndromes. Circulation. https://www.ahajournals.org/doi/10.1161/CIR.0000000000001309
5. National Heart, Lung, and Blood Institute. Coronary Heart Disease. https://www.nhlbi.nih.gov/health/coronary-heart-disease

Disclaimer: This article is general educational information, not medical advice for any specific person. For personalized guidance, please schedule a consultation or talk to your physician.