What Is Coronary Heart Disease?
What Is Coronary Heart Disease? Symptoms and Treatment
Your heart pumps oxygen-rich blood to the rest of your body. But the heart muscle also needs its own steady blood supply.
That supply arrives through the coronary arteries, a network of blood vessels that runs across the surface of the heart. When these arteries cannot deliver enough oxygen-rich blood, the heart muscle may struggle—particularly during exercise or stress, when it has to work harder.
This is the basic problem behind coronary heart disease.
It can develop quietly over many years. Some people notice chest discomfort or breathlessness. Others have no obvious warning until a more serious event occurs. Understanding how the condition develops can make its symptoms, tests and treatments much easier to follow.
What Are the Coronary Arteries?
The coronary arteries are the heart’s own blood-supply vessels.
After oxygen-rich blood leaves the heart through the aorta, small branches carry some of it back to the heart muscle. These are the coronary arteries.
A useful way to picture them is as delivery roads. The heart may be responsible for sending blood around the entire body, but it still needs regular deliveries of oxygen and nutrients to keep pumping.
If one of those routes becomes too narrow, the heart may not receive enough oxygen when demand rises. If a route suddenly becomes blocked, part of the heart muscle can be injured.
What Is Coronary Heart Disease?
Coronary heart disease, often shortened to CHD, occurs when the coronary circulation cannot supply the heart muscle with enough oxygen-rich blood.
The most common cause is atherosclerosis. This is a gradual process in which plaque builds within the walls of an artery. Plaque contains cholesterol, fats, calcium and other materials. As it accumulates, the artery can become narrower and less flexible, reducing blood flow.
Coronary heart disease is also commonly called coronary artery disease, or CAD. You may also see the term ischaemic heart disease, spelled ischemic heart disease in American English. In everyday health information, these terms are often used to describe the same broad condition.
Coronary heart disease is one type of cardiovascular disease. Cardiovascular disease is the wider category covering conditions that affect the heart or blood vessels, including stroke, heart failure and heart valve disease.
How Does Coronary Heart Disease Develop?
Coronary heart disease usually develops over time rather than appearing overnight.
The process often follows this pattern:
- Changes occur within the inner lining of a coronary artery.
- Cholesterol and other materials collect in the artery wall.
- Plaque gradually forms and may narrow the space available for blood to flow.
- The heart may still receive enough blood while you are resting, but not when you walk uphill, carry shopping, exercise or feel stressed.
- If a plaque breaks open, a blood clot can form around it and suddenly reduce or stop blood flow.
Think of the difference between a road that has slowly lost lanes and a road that is suddenly closed. Gradual narrowing may produce predictable symptoms during exertion. A sudden blockage can cause an acute coronary syndrome, including a heart attack.
Plaque in the large coronary arteries is the leading cause, but it is not the only way coronary blood flow can be disrupted. Some people have problems involving the heart’s smaller blood vessels, known as coronary microvascular disease. Others may experience temporary tightening, or spasm, of a coronary artery. These conditions can cause symptoms even when a major artery does not appear severely blocked.
Is Coronary Heart Disease the Same as Atherosclerosis?
Not quite.
Atherosclerosis is the process of plaque building within an artery. It can affect arteries in several parts of the body.
Coronary heart disease describes what happens when the coronary arteries or coronary circulation are affected and the heart muscle does not receive the blood supply it needs.
In other words, atherosclerosis is commonly the underlying process; coronary heart disease is the condition it can create in the heart’s blood vessels.
What Is the Difference Between CHD, Angina and a Heart Attack?
These terms are connected, but they do not mean the same thing.
- Coronary heart disease is the underlying, usually long-term condition affecting blood flow to the heart muscle.
- Angina is chest pain or discomfort caused by the heart muscle not receiving enough oxygen-rich blood. It is a symptom, not a separate type of heart attack.
- A heart attack occurs when blood flow to part of the heart is severely reduced or stopped long enough to injure the heart muscle.
Stable angina often follows a pattern. It may appear during physical activity or emotional stress and improve with rest or prescribed medicine. New chest discomfort, symptoms at rest, symptoms that are becoming more frequent or severe, or discomfort that does not settle as expected may signal an emergency.
AtheroCare’s guide to the difference between angina and a heart attack explains these terms in more detail.
What Are the Symptoms of Coronary Heart Disease?
Symptoms vary from person to person. Some people have no symptoms, while others notice a recurring pattern.
Possible symptoms include:
- Pressure, squeezing, tightness, heaviness or burning in the chest
- Chest discomfort that appears during activity, cold weather or emotional stress
- Pain or discomfort spreading to an arm, shoulder, neck, jaw or back
- Shortness of breath
- Unusual tiredness or a noticeable reduction in exercise tolerance
- Dizziness or light-headedness
- Nausea or indigestion-like discomfort
- Sweating
Symptoms may be subtle. A person might notice that the same walk now requires more stops, that carrying groceries causes chest pressure, or that ordinary tasks leave them unusually breathless.
These symptoms are not specific to coronary heart disease, and many other conditions can cause them. They should not be self-diagnosed. New, recurring or unexplained symptoms deserve medical assessment.
Can You Have Coronary Heart Disease Without Knowing It?
Yes.
Coronary heart disease can be silent, particularly in its earlier stages. Some people do not experience recognisable angina before a heart attack or another complication.
This is one reason cardiovascular risk assessment matters even when you feel well. Blood pressure, cholesterol, blood sugar, smoking, family history and age can provide useful information long before symptoms appear.
A normal day-to-day feeling does not guarantee that every risk factor is within a healthy range.
Who Is More Likely to Develop Coronary Heart Disease?
There is no single cause. Risk usually reflects a combination of biology, health conditions, daily habits and the environment in which a person lives.
Risk factors that may be changed or managed
These include:
- Smoking or vaping
- High blood pressure
- Unhealthy cholesterol levels
- Diabetes or persistently high blood sugar
- Low levels of physical activity
- An eating pattern high in saturated fat, trans fat, salt or highly processed foods
- Carrying excess body weight, particularly around the waist
- Drinking harmful amounts of alcohol
- Poorly managed sleep apnoea
- Chronic stress and limited opportunities for recovery
Blood pressure is especially easy to overlook because it usually causes no clear symptoms. Learn what blood pressure is and why it matters for heart health.
Risk factors that cannot be changed
These include:
- Getting older
- A family history of premature coronary heart disease
- Inherited cholesterol conditions
- Sex-related and hormonal factors
- Certain ethnic backgrounds
- Some chronic health conditions
Family history does not determine your future, but it can change the level of attention that other risk factors deserve. Read more about what a family history of heart disease may mean for you.
Social and environmental factors also matter. Access to nutritious food, safe places to exercise, preventive healthcare, medicines, stable housing and manageable working conditions can all influence cardiovascular health.
Why Does Coronary Heart Disease Become More Relevant After 50?
Age itself does not suddenly cause coronary heart disease at 50. The risk tends to rise because plaque and other risk factors can build over decades.
By midlife and later life, a person may have had many years of exposure to high blood pressure, unhealthy cholesterol, smoking, diabetes, inactivity or chronic stress. Hormonal changes after menopause can also influence cardiovascular risk.
This makes your 50s and beyond a useful time to know your numbers and review the full picture with a healthcare professional.
Do not assume that new chest discomfort, breathlessness or a sharp decline in stamina is simply part of getting older. Ageing may change how the body responds to exertion, but new or worsening symptoms still need proper assessment.
Useful information to know includes:
- Your recent blood pressure readings
- Your cholesterol and triglyceride results
- Your blood sugar or diabetes status
- Your smoking history
- Your close relatives’ history of heart attack, stroke or early heart disease
- Any change in how much activity you can comfortably manage
Can Coronary Heart Disease Be Prevented?
Not every case can be prevented, and no lifestyle can guarantee that someone will remain free from heart disease.
However, many major risk factors can be reduced or managed. Acting on several factors together is usually more valuable than searching for one perfect food, supplement or exercise.
Helpful steps may include:
- Not smoking or vaping
- Following a varied eating pattern centred on vegetables, fruit, wholegrains, legumes, nuts, fish and other suitable protein sources
- Limiting foods high in salt, added sugar, saturated fat and trans fat
- Being physically active at a level appropriate for your health and ability
- Maintaining a weight that supports your overall health
- Limiting alcohol or avoiding it where appropriate
- Getting regular, restorative sleep
- Managing blood pressure, cholesterol and blood sugar with professional guidance
- Taking prescribed medicines as directed
- Attending recommended reviews and follow-up appointments
People with symptoms, a diagnosed heart condition or a long break from exercise should ask a qualified healthcare professional what type and intensity of activity are appropriate before making a major change.
How Is Coronary Heart Disease Diagnosed?
There is no single test that is right for everyone.
A healthcare professional will usually begin by asking about:
- Your symptoms and when they occur
- Your medical history
- Your medicines
- Your family history
- Smoking, activity, eating habits and other risk factors
They may check your pulse, blood pressure and heart sounds, and arrange blood tests for cholesterol, triglycerides, blood sugar and other relevant markers.
Depending on your symptoms and risk, further tests may include:
- Electrocardiogram, or ECG: Records the heart’s electrical activity and may show rhythm problems or signs of reduced blood flow or previous injury.
- Echocardiogram: Uses ultrasound to assess the heart’s structure, valves and pumping function.
- Exercise or medication stress test: Looks at how the heart responds when it has to work harder.
- Coronary CT angiography, or CCTA: Uses CT imaging to examine the coronary arteries.
- Coronary angiography: Uses contrast dye and X-ray imaging to show where coronary arteries are narrowed or blocked.
- Other forms of heart imaging: May assess blood flow, heart muscle damage or possible microvascular disease.
Not everyone needs all of these tests. The most useful choice depends on the question being asked, your symptoms, your overall risk and the services available where you live.
How Is Coronary Heart Disease Treated?
Treatment is individual. It depends on your symptoms, test results, other health conditions and the extent to which blood flow is affected.
The main goals are to improve or maintain blood flow, control symptoms, reduce the chance of heart attack and help you remain active and independent. Treatment may involve lifestyle changes, medicines, procedures or a combination of these approaches.
Lifestyle and risk-factor management
Treatment often includes support with smoking cessation, physical activity, eating patterns, weight, sleep, stress, blood pressure, cholesterol and diabetes.
These measures are not a substitute for prescribed treatment. They work alongside medical care.
Medicines
Depending on the person, medicines may be used to:
- Lower LDL cholesterol and help stabilise plaque
- Reduce chest pain or the heart’s workload
- Manage blood pressure
- Control diabetes
- Reduce the chance of unwanted blood clots in people for whom antiplatelet treatment is appropriate
Statins are commonly prescribed for people with diagnosed coronary heart disease because cholesterol management is an important part of reducing future cardiovascular risk. Treatment decisions should be reviewed with the prescriber, not changed independently. AtheroCare’s article Do I Have to Take Statins Forever? explains why the answer depends on individual risk and the reason the medicine was prescribed.
Do not start daily aspirin simply because you are worried about heart disease. Aspirin can cause serious bleeding and is not suitable for everyone. It should be taken regularly only when a qualified healthcare professional has recommended it for your circumstances.
Procedures and surgery
Some people need a procedure to improve blood flow.
- Percutaneous coronary intervention, or PCI: A small balloon is used to widen a narrowed artery. A mesh tube called a stent may be placed to help keep it open.
- Coronary artery bypass grafting, or CABG: A surgeon uses blood vessels from elsewhere in the body to create a new route around narrowed or blocked coronary arteries.
A stent or bypass can improve blood flow, but it does not remove the need to manage the underlying condition and its risk factors.
Cardiac rehabilitation
Cardiac rehabilitation combines supervised or guided activity, education, risk-factor support and emotional support. It may be recommended after a heart attack, stent procedure or bypass surgery, and for some people living with stable coronary heart disease.
A suitable programme can help people rebuild confidence and return to daily life more safely. Availability and referral arrangements differ by country, so ask your healthcare team what services exist locally.
Can Coronary Heart Disease Be Cured?
Coronary heart disease is generally treated as a long-term condition rather than something that is permanently cured by a single medicine or procedure.
That does not mean nothing can be done.
Treatment can relieve symptoms, improve blood flow, stabilise the condition and reduce the likelihood of future complications. Many people continue to lead active and fulfilling lives with appropriate treatment, follow-up and risk-factor management.
The most effective plan is usually the one that combines evidence-based medical care with sustainable daily habits.
When Should You Seek Emergency Medical Help?
Seek emergency medical help immediately for possible heart attack symptoms, including:
- New, severe or persistent pressure, squeezing, tightness, heaviness, burning or pain in the chest
- Chest discomfort that occurs at rest or is different from your usual pattern
- Discomfort spreading to an arm, shoulder, neck, jaw or back
- Shortness of breath
- Cold sweating
- Nausea or vomiting
- Feeling faint, suddenly weak or unusually unwell
Symptoms do not always begin dramatically, and some people have little or no chest pain. Do not wait for symptoms to become severe or try to diagnose the cause yourself.
Contact the emergency medical service for your location and follow the operator’s instructions. Where emergency transport is available, avoid driving yourself.
If you have already been diagnosed with angina, follow the action plan and medicine instructions provided by your healthcare team. Seek emergency help when symptoms are new, different, more severe, occur at rest or do not settle in the way your clinician told you to expect.
Questions to Ask Your Doctor
You may wish to ask:
- What is my overall cardiovascular risk?
- Could my symptoms be related to coronary heart disease?
- Which tests would be useful, and what would each test tell us?
- What should my blood pressure, cholesterol and blood sugar targets be?
- Is my family history important?
- What type of physical activity is safe for me?
- Do I need medicine, and what is each medicine intended to do?
- What side effects or warning signs should I report?
- Would cardiac rehabilitation be suitable for me?
- When should I arrange another review?
Take an up-to-date list of your medicines, supplements, symptoms and relevant family history to the appointment.
The Bottom Line
Coronary heart disease develops when the heart muscle does not receive enough oxygen-rich blood, most often because plaque has narrowed the coronary arteries.
It may cause angina, shortness of breath or reduced exercise tolerance, but it can also be silent. A heart attack is a possible acute complication, not another name for the long-term condition.
Age and family history matter, but so do blood pressure, cholesterol, blood sugar, smoking, activity and other factors that can often be managed. Diagnosis may involve a risk assessment, blood tests and heart imaging. Treatment can include lifestyle support, medicines, procedures and cardiac rehabilitation.
Knowing your risk and responding to new symptoms promptly are practical steps at any age—and particularly valuable through your 50s and beyond.
Related AtheroCare Reading
Family History of Heart Disease: What Does It Mean for You?
Learn how inherited factors can influence cardiovascular risk without determining your future.
What Is Blood Pressure and Why Does It Matter?
Understand systolic and diastolic pressure and why regular checks are useful.
Angina vs. Heart Attack: How to Recognize the Difference
Learn how these related terms differ and why changing chest symptoms need attention.
Do I Have to Take Statins Forever?
Explore why statin treatment may be long term and which questions to discuss with your prescriber.
References
Heart Foundation: What Is Coronary Heart Disease?
National Heart, Lung, and Blood Institute: What Is Coronary Heart Disease?
National Heart, Lung, and Blood Institute: Causes and Prevention
National Heart, Lung, and Blood Institute: Symptoms
National Heart, Lung, and Blood Institute: Diagnosis
National Heart, Lung, and Blood Institute: Treatment
Medical Disclaimer
This article is provided for general information and education only. It is not intended to provide medical advice, diagnosis or treatment.
Always speak with a qualified healthcare professional about symptoms, test results, medicines and your personal cardiovascular risk. Do not begin, stop or change any treatment based only on information in this article.
