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Coronary Artery Disease: Causes, Symptoms, Diagnosis & Treatment

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Learn about coronary artery disease including its causes, symptoms, diagnosis & treatment options for managing narrowed or blocked heart arteries.

Last updated: October 19, 2026

Coronary artery disease (CAD) is a build-up of plaque in the arteries that supply the heart muscle, which can narrow them and reduce blood flow.

It can be silent for years, then cause angina (chest discomfort), breathlessness, or a heart attack.

Stable CAD and a heart attack are different situations. A suspected heart attack is an emergency.

Diagnosis uses your history, blood tests, an ECG and imaging or stress tests; angiography is used selectively.

Treatment combines lifestyle change, medicines, and, for selected patients, stenting (PCI) or bypass surgery (CABG). Neither procedure cures the underlying disease.

Coronary artery disease is one of the most common and serious heart conditions, yet it can develop quietly over many years. This guide explains how it forms, what the warning signs are, how doctors diagnose it, and how medicines, stents and bypass surgery are chosen. It is written for patients and families, including those considering a second opinion or care in India. It is general education and cannot diagnose you.

What is coronary artery disease? Coronary artery disease occurs when fatty plaque builds up inside the coronary arteries, the vessels that supply blood to the heart muscle. The plaque can narrow an artery or rupture and form a clot, reducing blood flow. This may cause angina, a heart attack or other complications, though it can also be silent.

Table of Contents

What Is Coronary Artery Disease?

Coronary artery disease means the arteries that feed the heart have become narrowed or blocked by plaque, so the heart muscle may not always get enough oxygen-rich blood. The process, called atherosclerosis, usually develops slowly over years.

The heart is a muscle that works constantly, so it needs its own blood supply through the left and right coronary arteries and their branches. In atherosclerosis, cholesterol, inflammatory cells and other material gather in the artery wall and form plaque. As plaque grows, it can:

Narrow the artery, limiting blood flow when the heart works harder, which may cause angina.
Rupture or erode, triggering a blood clot that can suddenly block the artery and cause a heart attack.

CAD may exist without any symptoms. Doctors also distinguish chronic coronary disease (long-term, often with predictable symptoms and a relatively stable course) from acute coronary syndrome (a sudden reduction in blood flow, including unstable angina and heart attack), which needs emergency care.

What Causes Coronary Artery Disease?

In most people, CAD is caused by atherosclerosis. It starts when the inner lining of the artery (the endothelium) is damaged or does not work properly, often through factors like high LDL cholesterol, high blood pressure, smoking and high blood sugar. Cholesterol-carrying particles then enter the wall, trigger inflammation and form plaque.

Over time, plaque can grow, harden with calcium or become unstable. If its surface breaks, platelets and clotting factors gather and a clot may form, which can abruptly block blood flow.

Not all reduced blood flow to the heart is due to a large blockage. Other causes of myocardial ischaemia (reduced oxygen supply to the heart muscle) include coronary artery spasm (vasospastic angina) and disease of the very small heart vessels (coronary microvascular dysfunction). These are less common but are an important reason why some people have angina or a heart attack without a large blockage on angiography.

Risk Factors for Coronary Artery Disease

Risk is cumulative: several modest risk factors can add up, and people with few obvious risk factors can still develop CAD.

Modifiable risk factors

Risk factor	Why it matters	Possible risk-reduction approach
High LDL cholesterol and other lipid abnormalities	LDL contributes to plaque formation	Diet, activity, and lipid-lowering medicines when indicated
High blood pressure	Strains and damages artery walls	Lifestyle changes, blood-pressure medicines
Diabetes	Speeds up atherosclerosis and affects small vessels	Glucose control, lifestyle, medicines, regular review
Smoking and tobacco exposure	Damages the lining of arteries and promotes clots	Stopping tobacco, with cessation support
Physical inactivity	Linked to higher blood pressure, weight and glucose	Regular activity as advised by your clinician
Unhealthy diet pattern, excess weight	Raise lipids, blood pressure and diabetes risk	Heart-healthy eating pattern, weight management
Chronic kidney disease	Associated with higher cardiovascular risk	Kidney care, blood pressure and lipid control
Poor sleep, chronic stress, depression	Associated with higher risk in some evidence	Sleep care, stress management, mental-health support

Certain substance exposures, such as some recreational drugs, can also be harmful to the heart.

Non-modifiable or background risk factors

Increasing age
Family history of premature coronary disease
Inherited lipid disorders, such as familial hypercholesterolaemia
Genetic predisposition. Several studies suggest South Asian ancestry is associated with CAD at younger ages, and your clinician may take this into account in risk assessment. [Reviewer to confirm and cite the AHA scientific statement.]

Having risk factors does not mean you have CAD, and having none does not rule it out.

Symptoms of Coronary Artery Disease

CAD symptoms occur when the heart muscle does not get enough blood for its workload. Many people have no symptoms for years, and symptoms alone cannot confirm or exclude CAD.

Chest pain or angina

Angina is typically a pressure, tightness, squeezing or heaviness in the chest. In stable angina it often appears with exertion or emotional stress and eases with rest, but patterns vary. Symptoms cannot reliably tell a heart attack from a less serious cause without medical evaluation.

Shortness of breath

Breathlessness can come with reduced blood flow to the heart, but it is not specific to CAD and has many other causes.

Discomfort beyond the chest

The arms, shoulders, back, neck, jaw or upper abdomen may feel pain, pressure or discomfort.

Fatigue, nausea, sweating or dizziness

These can accompany chest discomfort or breathlessness, and sometimes occur on their own.

Symptoms in women, older adults and people with diabetes

Chest discomfort remains the most common symptom across peoples. However, some people, including women, older adults and people with diabetes, are more likely to have less typical symptoms such as unusual fatigue, breathlessness, nausea or discomfort outside the chest. Women do not always have different symptoms from men.

Can coronary artery disease have no symptoms?

Yes. Silent myocardial ischaemia and symptom-free CAD exist, and a heart attack can be the first sign. This is why risk assessment matters, especially if you have diabetes, a strong family history, or several risk factors. Not having symptoms does not mean your arteries are healthy.

Heart Attack Warning Signs: When to Seek Emergency Care

Call emergency services immediately if you suspect a heart attack. In India, 112 is the national emergency number; use your local emergency number elsewhere.

Warning signs include:

Chest pressure, squeezing, heaviness or discomfort lasting more than a few minutes, or that goes away and returns

Pain or discomfort spreading to the arm, back, neck, jaw or upper abdomen

Shortness of breath

Cold sweat, nausea or light-headedness

Sudden collapse or severe weakness

A heart attack can happen without dramatic chest pain. Do not wait to see whether symptoms disappear, and do not drive yourself if emergency help is available. Follow the emergency operator’s instructions, including any advice about medicines such as aspirin, since it is not right for everyone.

Types, Presentations and Severity of Coronary Artery Disease

Severity is about more than the percentage of narrowing seen on a scan. Doctors consider how many arteries are affected and where, how symptoms affect daily life, whether there is evidence of ischaemia, how well the heart muscle pumps, whether an acute coronary syndrome is present, and your overall health.

The main clinical presentations are:

Chronic coronary disease with stable angina: symptoms are relatively predictable.
Acute coronary syndrome (ACS): includes unstable angina and heart attack (myocardial infarction), either STEMI (a complete blockage, with a characteristic ECG pattern) or NSTEMI. These need urgent assessment.
Vasospastic angina and coronary microvascular dysfunction: angina caused by artery spasm or small-vessel disease.

Clinical presentation	General meaning	Typical clinical priority
Asymptomatic or incidentally detected disease	Plaque may be present without clear symptoms	Individualised risk assessment and prevention
Chronic stable symptoms	Symptoms are relatively predictable	Clinical evaluation and appropriate medical treatment or testing
Worsening or new symptoms	May indicate an unstable condition	Urgent medical assessment
Suspected acute coronary syndrome	Possible heart attack or unstable angina	Emergency evaluation

This table is an educational overview, not a diagnostic classification. Symptoms alone cannot tell stable disease from unstable angina or a heart attack.

How Is Coronary Artery Disease Diagnosed?

Diagnosis depends on your symptoms, how stable you are, your risk profile and the findings of your examination. In a suspected heart attack, tests are done rapidly in an emergency setting. In a stable situation, doctors choose tests step by step, and not everyone needs every test.

Test	What it helps assess	Important limitations or considerations
History and physical examination	Symptoms, risk factors, family history, blood pressure, pulse, signs of heart failure	Cannot confirm or exclude CAD on its own
Blood tests: lipids, glucose/HbA1c, kidney function	Risk factors and contributing conditions	Show risk, not whether arteries are narrowed
High-sensitivity cardiac troponin	Heart-muscle injury in suspected acute coronary syndrome	Interpreted with symptoms, ECG and timing; repeat measurements are often needed
ECG	Signs of ischaemia, past injury or acute heart attack	A normal ECG does not rule out CAD or an acute coronary syndrome
Echocardiogram	Heart pumping function, wall motion, valves	Does not directly show coronary plaque
Exercise or pharmacological stress test	Whether the heart develops ischaemia under stress	Choice depends on risk, ability to exercise, baseline ECG; can miss or over-call disease
Coronary CT angiography	Coronary anatomy and plaque in selected patients	Depends on heart rhythm, kidney function, contrast use; may need further tests
Invasive coronary angiography	Direct view of coronary arteries; guides PCI or CABG	Invasive with procedural risks; not needed for every patient
FFR and similar physiology tests	Whether a narrowing meaningfully limits blood flow	Used in selected patients, often during angiography

A few points worth knowing:

Troponin is mainly relevant when a heart attack is suspected. It is read together with symptoms, ECG changes and sometimes repeat blood tests.
Stress tests show how the heart behaves under extra workload, either with exercise or with a medicine that mimics it.
Coronary CT angiography and invasive angiography both look at the arteries, but angiography is a catheter procedure and is usually reserved for patients who need it for diagnosis or to guide treatment.
No single test is best for everyone, and the cheapest or most advanced is not always the right one.

Treatment of Coronary Artery Disease

Treatment has three aims: reduce the risk of heart attack and cardiovascular death, relieve symptoms, and improve quality of life. The right plan depends on disease severity, symptoms, anatomy, other illnesses and your preferences.

Treatment	Main purpose	When it may be considered	Key considerations
Lifestyle changes and cardiac rehabilitation	Slow disease, lower risk, improve fitness	For almost everyone with CAD or at risk	Needs sustained effort; exercise only after clinical assessment
Lipid-lowering medicines	Lower LDL cholesterol and reduce events	Most people with established CAD	Choice and monitoring are individual
Antiplatelet medicines	Reduce clot formation	Established CAD, after heart attack or stent, when indicated	Raise bleeding risk; not for everyone
Anti-angina medicines	Relieve symptoms	When symptoms occur	Do not all reduce heart attack risk
PCI (angioplasty and stenting)	Open a narrowed artery	Acute coronary syndromes; some patients with persistent symptoms despite medicines	Needs antiplatelet medicines afterwards; does not cure atherosclerosis
CABG (bypass surgery)	Route blood around blocked segments	Selected multivessel or left main disease, some with diabetes or reduced heart function	Major surgery; recovery takes time; does not remove underlying risk

Lifestyle changes and cardiac rehabilitation

Stop smoking and avoid tobacco exposure, with cessation support if needed.
Eat a heart-healthy pattern, rich in vegetables, fruit, whole grains, legumes and fish, and low in processed foods, trans fats and excess salt and sugar.
Be physically active, at a level advised by your clinician. Do not start strenuous exercise if symptoms are new, worsening or unexplained.
Manage blood pressure, diabetes and cholesterol, and weight where relevant.
Look after sleep and stress.
Cardiac rehabilitation is a supervised programme of exercise, education and support, recommended after a heart attack or certain procedures.

Medicines for coronary artery disease

Medicines fall into groups with different jobs. Your clinician chooses them based on your condition, other illnesses, side effects and what you already take. This article does not give doses.

Statins and other LDL-lowering medicines (such as ezetimibe, PCSK9-targeting medicines or bempedoic acid in selected patients) lower cholesterol and reduce heart attacks.
Antiplatelet medicines, such as aspirin or a P2Y12 inhibitor, reduce clotting. They are used when indicated and increase bleeding risk, so not everyone should take aspirin.
Beta-blockers slow the heart and reduce its workload and are used in selected patients, for example after a heart attack or with certain symptoms or heart weakness.
Calcium channel blockers and nitrates help relieve angina symptoms.
ACE inhibitors or ARBs are used in selected patients, such as those with high blood pressure, diabetes, kidney disease or heart weakness.

Important safety points: do not stop prescribed cardiac medicines without speaking to your clinician (especially after a stent), tell every doctor and dentist what you take, and distinguish medicines that lower long-term risk from those that mainly relieve symptoms.

Coronary angioplasty and stenting (PCI)

In percutaneous coronary intervention (PCI), a catheter is passed through an artery in the wrist or groin to the narrowed coronary artery. A small balloon widens it, and a stent (a tiny mesh tube) is usually left to hold it open.

PCI is most clearly beneficial in acute coronary syndromes, particularly a heart attack, where opening the artery quickly saves heart muscle. In stable CAD, trials such as ISCHEMIA suggest that PCI is not automatically better than good medical treatment for preventing heart attack or death in many patients. It can relieve angina when symptoms persist despite medicines.

After a stent, antiplatelet medicines are essential for the period your cardiologist prescribes. Risks include bleeding, vessel injury, kidney strain from contrast, stent re-narrowing or clotting, and rarely emergency surgery. PCI treats a narrowing; it does not cure the disease in the other arteries.

Coronary artery bypass grafting (CABG)

In CABG, a surgeon uses a blood vessel from elsewhere in the body (often an artery from the chest wall, a leg vein, or an arm artery) to create a detour around a blocked segment of a coronary artery.

Factors that may favour CABG include certain patterns of multivessel disease, significant left main coronary artery disease, diabetes in relevant situations, reduced heart function and anatomy that is difficult to stent. It is a major operation with its own risks, such as bleeding, infection, stroke, rhythm problems and a longer recovery. CABG is not always better than stenting, and not everyone with multiple blockages needs surgery.

Treatment during a heart attack

Emergency treatment depends on the type of acute coronary syndrome and may include urgent angiography, primary PCI to open the blocked artery, antithrombotic medicines and other measures, directed by an emergency and cardiac team. It is time-sensitive, and an article cannot replace emergency care.

When a heart team opinion helps

In complex cases where both PCI and CABG are possible, a heart team (an interventional cardiologist, a cardiac surgeon and often a non-invasive cardiologist) reviews your anatomy, risks and preferences together. You can ask for this, particularly before elective surgery.

Angioplasty and Stenting vs Bypass Surgery

PCI and CABG are not interchangeable. The choice depends on coronary anatomy, symptoms, other illnesses and shared decision-making. For a fuller comparison, see our guide to [stent vs bypass surgery].

Feature	Angioplasty and stenting (PCI)	Bypass surgery (CABG)
How it works	Catheter, balloon and stent open the artery from inside	Graft vessels route blood around blocked segments
Typical considerations	Heart attacks; selected single- or limited-vessel disease; patients who prefer a less invasive option	Selected complex multivessel or left main disease; some people with diabetes or reduced heart function
Recovery and hospital stay	Usually shorter; individual	Longer; individual, with a sternum or leg wound to heal
Potential complications	Bleeding, vessel injury, stent clotting or re-narrowing, kidney strain	Bleeding, infection, stroke, rhythm problems, longer recovery
Long-term medicines and follow-up	Antiplatelet therapy as prescribed, plus lifelong risk-factor control	Antiplatelet therapy and risk-factor control, plus graft follow-up
What influences the choice	Anatomy, symptoms, diabetes, heart function, surgical risk, preference	The same factors, and a heart team assessment

Neither procedure removes the underlying tendency to develop atherosclerosis.

Can Coronary Artery Disease Be Prevented or Reversed?

CAD often cannot be fully reversed, but it can often be slowed, and in some people plaque burden can shrink modestly with strong risk-factor control, particularly effective LDL-lowering treatment. You should not assume that established plaque will disappear.

Some important distinctions:

Feeling better does not prove plaque has gone.
A stent treats a narrowing but does not cure disease in the rest of the arteries.
Bypass surgery reroutes blood flow but does not remove cardiovascular risk.
Long-term risk-factor control and prescribed treatment remain important.

Evidence-based ways to reduce risk and slow progression:

Avoid tobacco and seek help to quit.
Keep blood pressure and blood sugar in the range advised.
Follow a heart-healthy eating pattern and stay active as advised.
Manage LDL cholesterol according to your overall risk and take medicines consistently.
Attend follow-up visits, and discuss family history and inherited cholesterol disorders with a clinician.

Lifestyle change alone is not enough for every person with established CAD. Beware of claims that a supplement or diet can remove arterial plaque or replace indicated treatment.

Possible Complications of Coronary Artery Disease

Complications can include heart attack, heart failure, rhythm disturbances (see our guide to [cardiac arrhythmias — link to be verified]), cardiogenic shock in severe acute cases, sudden cardiac death, and reduced exercise capacity that affects daily life. The likelihood varies, and timely assessment and evidence-based treatment can lower risk.

Coronary Artery Disease Treatment in India

Selected tertiary hospitals in India offer cardiology, interventional cardiology, cardiac surgery and cardiac rehabilitation, serving both Indian and international patients. Availability and suitability vary between hospitals and between patients, so the plan should be based on your own records, symptoms, test results and stability.

When comparing options, it helps to ask about:

The experience of the cardiologist and interventional cardiologist, particularly with complex disease
Whether cardiac surgery is available on site if CABG might be needed
Emergency and intensive care capacity, and access to a catheterisation laboratory and diagnostic imaging
How complex coronary disease is managed, and whether a heart team reviews difficult cases
Rehabilitation and long-term follow-up arrangements
Clear, written communication about alternatives, risks and expected recovery

No hospital can ethically promise a result. We do not rank hospitals here, and a lower price is not proof that a plan is right for you.

What does treatment cost in India?

Cost depends on consultations and tests (including coronary CT angiography or invasive angiography), whether PCI or CABG is recommended, the number and type of stents, hospital and intensive-care needs, length of stay and complications, medicines, rehabilitation and follow-up, and, for international patients, travel, accommodation and attendant costs.

Published domestic figures for angioplasty with stenting are usually quoted at roughly INR 1.5 lakh to INR 4 lakh or more, depending on the hospital, city and stent type (SBI General, page updated May 2026), and one insurer’s indicative average is about INR 3 lakh. These are indicative domestic prices, not quotes. International patients are often quoted more than domestic list prices, and complex disease, multiple stents, emergencies and complications change the total. We found no reliable published figure for bypass surgery, so we do not quote one.

Ask for an itemised written estimate after specialist review. If you may be having a heart attack, seek emergency care at once; do not delay it to compare prices.

How International Patients Can Arrange Cardiac Treatment in India

A safe approach starts with your records and a specialist opinion, not with a flight. A patient with possible acute coronary syndrome should go to the nearest emergency department and not begin routine international travel planning.

Gather records: medical history, medicines, ECGs, blood results, imaging reports and any angiography records or discs.
Get a specialist review from an appropriately qualified cardiologist.
Clarify the plan: the diagnosis, urgency, recommended treatment, alternatives and expected follow-up.
Request a written treatment plan and itemised estimate.
Confirm capability: ask whether the hospital can manage your specific condition, including surgery if needed.
Check visa rules through official Indian government sources and the Indian mission in your country.
Plan travel only after the treating team confirms you are fit to travel.
Plan continuity: medicines, discharge documents, rehabilitation, and follow-up after you go home.

How Shifam Health fits in. Shifam Health is an India-based healthcare coordination organisation, not a hospital, and it does not diagnose or treat CAD. It can help collect records, request specialist opinions, shortlist hospitals, coordinate treatment plans and written estimates, and support medical visa documentation, travel, accommodation, interpretation and hospital logistics. It cannot guarantee outcomes, appointments, visa approval, treatment suitability or savings. Clinical decisions belong to your treating team.

Frequently Asked Questions

What is coronary artery disease?

Coronary artery disease (CAD) occurs when plaque builds up in the arteries supplying blood to the heart, reducing blood flow.

What causes coronary artery disease?

Atherosclerosis is the main cause. Risk factors include high cholesterol, high blood pressure, smoking, diabetes, and obesity.

What are the early symptoms of blocked heart arteries?

Symptoms may include chest pressure, breathlessness, and unusual fatigue during activity. Some people have no symptoms.

Can coronary artery disease occur without chest pain?

Yes. Some people experience breathlessness, nausea, or fatigue instead of typical chest pain, while others have no noticeable symptoms

What is the difference between coronary artery disease and a heart attack?

CAD is a long-term condition affecting the coronary arteries. A heart attack occurs when blood flow to part of the heart muscle is severely reduced or blocked, causing damage.

How is coronary artery disease diagnosed?

Tests may include an ECG, blood tests, echocardiography, stress testing, coronary CT angiography, or invasive angiography.

Can coronary artery disease be treated with medication alone?

Yes. Many patients with stable CAD can manage it with medication and lifestyle changes. Others may need a procedure.

When is angioplasty or bypass surgery recommended?

Angioplasty may help restore blood flow in selected cases, while bypass surgery may be recommended for certain complex or extensive blockages. The choice depends on individual assessment.

Can coronary artery disease be reversed?

It cannot always be reversed, but lifestyle changes and appropriate treatment can slow progression and sometimes reduce plaque.

Can someone live a long life with coronary artery disease?

Many people live for years with proper treatment, risk-factor management, and regular medical follow-up.

How much does coronary artery disease treatment cost in India?

Costs vary by treatment, hospital, stents, and length of stay. Request an individualized, itemized estimate.

Talk to Shifam Health

If you are considering cardiac care in India and would like help coordinating specialist opinions, treatment plans, cost estimates and travel logistics, Shifam Health can support you. We are not an emergency service, and you should never contact us before seeking urgent medical care.