Quick answer: ischemic heart disease is a reduction in blood flow to the heart muscle, almost always caused by a buildup of fatty plaque narrowing the coronary arteries — a process called atherosclerosis. It is also called coronary artery disease or coronary heart disease. When the narrowing limits blood flow during exertion, it causes chest pain (angina); if a plaque ruptures and blocks the artery completely, it causes a heart attack. It is the leading cause of death worldwide, but the biggest risk factors are modifiable.
Warning Signs: Call Emergency Services
- Chest pain, pressure or tightness lasting more than a few minutes, or coming and going
- Discomfort spreading to the arm, jaw, neck, back or stomach
- Shortness of breath, cold sweat, nausea or light-headedness
- Sudden unexplained exhaustion, particularly in women
Call an ambulance rather than driving. Many heart attacks are not dramatic — no clutching the chest, no collapse — and can feel like indigestion or simply feeling unwell, particularly in women, people over 75 and people with diabetes. Symptoms are not always present before a serious event, which is why known risk factors like high blood pressure and high cholesterol are managed proactively rather than only after symptoms appear.
What Ischemic Heart Disease Is
The heart muscle has its own dedicated blood supply, delivered by the coronary arteries on its surface. Over years, fatty plaque builds up in the walls of these arteries — atherosclerosis — narrowing and stiffening them. When a narrowed artery cannot deliver enough blood during exertion, the result is angina. If a plaque ruptures, a clot can form and block the artery entirely, causing a heart attack, in which part of the heart muscle begins to die from lack of oxygen.
Ischemic heart disease, coronary artery disease and coronary heart disease all refer to the same underlying process; the names are used interchangeably in most contexts.
Causes
The main driver is high LDL (“bad”) cholesterol, which contributes to plaque formation on artery walls. Other major contributors include high blood pressure, smoking, diabetes, physical inactivity, obesity, and a family history of early heart disease. Most people who develop ischemic heart disease have more than one of these factors present, and the factors compound rather than simply add.
Symptoms
Chest pain or discomfort with exertion — angina — is the classic symptom, typically easing with rest. Other symptoms can include shortness of breath, fatigue, weakness, light-headedness, or a rapid or irregular heartbeat. Early disease is often silent: high blood pressure and high cholesterol produce no sensations at all, which is why both are found through testing rather than symptoms, and why a substantial number of people first learn they have the disease when they have a heart attack.
Diagnosis
Diagnosis typically combines the symptom history with tests: an ECG at rest or during exertion, an echocardiogram, blood tests including a lipid panel, a stress test, CT coronary angiography (increasingly the first-line imaging test for new stable chest pain), and, when the result would change treatment, invasive coronary angiography.
Treatment Options
1. Lifestyle changes
Quitting smoking, regular exercise, a heart-healthy diet and maintaining a healthy weight reduce risk and help manage symptoms — the foundation of treatment regardless of what else is added.
2. Medications
Antiplatelet drugs and statins reduce the risk of a future heart attack; beta blockers, calcium channel blockers and nitrates relieve symptoms. These do two separate jobs — some change long-term risk without making you feel different day to day, which is why they are still taken even when symptoms are controlled.
3. Angioplasty and stenting
A minimally invasive procedure that inflates a small balloon inside a narrowed artery to widen it; a stent is often placed to keep it open. In stable disease, large trials have found stenting relieves symptoms but does not on its own reduce the risk of death or heart attack compared with good medical therapy — the situation is different during an acute heart attack, where opening the artery urgently is life-saving.
4. Coronary artery bypass surgery
Creates a new route for blood to flow around a blocked artery, using a blood vessel taken from elsewhere in the body. Often preferred over stenting for complex multivessel disease or diabetes.
5. Cardiac rehabilitation
A supervised exercise and education program combining exercise training, nutrition counseling and stress management. Strong evidence supports it, and it remains widely under-used — ask whether you are eligible.
The right combination depends on the severity and underlying pattern of disease, and is decided together with your doctor based on your test results and overall health.
Frequently Asked Questions
A reduction in blood flow to the heart muscle, almost always caused by fatty plaque narrowing the coronary arteries. It is also called coronary artery disease or coronary heart disease. Narrowed arteries can cause chest pain during exertion, and a ruptured plaque can block an artery completely, causing a heart attack.
Mainly a buildup of fatty plaque (atherosclerosis) inside the coronary arteries, driven by high LDL cholesterol, high blood pressure, smoking, diabetes, physical inactivity, obesity and family history. Most people who develop it have more than one of these factors present at once.
Chest pain or discomfort with exertion (angina) is the classic symptom, along with shortness of breath, fatigue, weakness, light-headedness or a rapid or irregular heartbeat. Early disease is often silent, since high blood pressure and high cholesterol produce no symptoms on their own — testing finds them before symptoms would.
Diagnosis combines the symptom history with tests such as an ECG, echocardiogram, blood lipid panel, stress test, CT coronary angiography and, when the result would change treatment, invasive coronary angiography.
A large share of risk is modifiable: not smoking, exercising regularly, eating a heart-healthy diet, maintaining a healthy weight, and managing blood pressure, cholesterol and diabetes. These steps meaningfully lower risk even with a family history.
Untreated or poorly managed disease can lead to heart attack, heart failure, arrhythmias and sudden cardiac arrest. Managing risk factors and following a treatment plan reduces the risk of these complications.
Sources
- National Heart, Lung, and Blood Institute — Coronary Heart Disease.
- MedlinePlus — Coronary Artery Disease.
- World Health Organization — Cardiovascular diseases fact sheet.
- NHLBI — Cardiac Rehabilitation.
Last updated: August 2026. This article is general information and is not medical advice or a diagnosis. Treatment decisions should be made with your doctor based on your own test results and health history. If you have symptoms suggesting a heart attack, call emergency services rather than reading further.
