Heart Disease

IWBCA
Feb 13
13 min read

Heart disease is an umbrella term for conditions that damage the heart’s vessels, muscle, valves, or electrical system, with coronary artery disease as the most common form; these disorders increase the risk of heart attack, heart failure, stroke, sudden cardiac arrest, and multi-organ injury, but targeted lifestyle changes, medicines, and procedures can substantially reduce risk and improve outcomes.

Overview

What is heart disease?

Heart disease refers to a group of conditions that impair the function of the heart and its blood vessels. The most common form is coronary artery disease, in which atherosclerotic plaque accumulates in the coronary arteries that supply the heart muscle and can limit or abruptly block blood flow. Other forms of heart disease affect the heart muscle itself, the valves that direct blood flow through the chambers, or the electrical system that coordinates each heartbeat. Symptoms and treatments vary depending on which structure is involved, yet they share a common problem: when the heart is weakened or obstructed, it cannot reliably deliver oxygen and nutrients to the brain, kidneys, muscles, and other organs.

Heart disease often develops silently over many years as high blood pressure, elevated cholesterol, smoking, diabetes, and other risk factors injure blood vessels and the heart muscle. Clinical manifestations such as chest discomfort, shortness of breath, palpitations, leg swelling, or reduced exercise tolerance may not appear until significant damage has already occurred. If these conditions remain undetected or untreated, they can lead to heart attack, heart failure, life-threatening arrhythmias, stroke, and progressive organ dysfunction. When recognized early, however, a combination of structured lifestyle changes, evidence-based medications, and, when necessary, procedures can stabilize disease, prevent major events, and, in many cases, allow people to live for decades with manageable, well-controlled heart conditions.

Types of Heart Disease

What are the main categories clinicians include under heart disease?

Coronary Artery Disease (PAD): Coronary artery disease involves the narrowing or blockage of the coronary arteries by atherosclerotic plaque composed of cholesterol, inflammatory cells, and scar tissue. This process can limit blood flow to the heart muscle during exertion, causing angina, or it can suddenly rupture and form a clot, causing a heart attack. Coronary artery disease is the single most common form of heart disease and a major driver of heart attacks, heart failure, and sudden cardiac death.
Arrhythmias: Arrhythmias are abnormal heart rhythms that arise when the electrical signals coordinating the heartbeat are too fast, too slow, or disorganized. They range from benign extra beats to serious conditions such as atrial fibrillation, ventricular tachycardia, or complete heart block. Arrhythmias can cause palpitations, dizziness, fainting, stroke, or sudden cardiac arrest, and often require medications, procedures, or devices such as pacemakers or defibrillators.
Heart Valve Diseases: Heart valve diseases affect the leaflets that open and close to direct blood flow through the heart. Valves may become narrowed and stiff, which is called stenosis, or may fail to close tightly, which is called regurgitation or insufficiency. Either condition can force the heart to work harder to pump blood, eventually leading to symptoms such as breathlessness, chest discomfort, fatigue, and heart failure. Some valve diseases can be managed with medications, whereas others require surgical or catheter-based repair or replacement.
Cardiomyopathy: Cardiomyopathy refers to diseases of the heart muscle that change its size, thickness, or stiffness. Examples include dilated cardiomyopathy, hypertrophic cardiomyopathy, and restrictive cardiomyopathy. These conditions can be inherited, related to high blood pressure, alcohol or drug exposure, infections, or autoimmune and metabolic disorders. Cardiomyopathy reduces the heart’s pumping efficiency and can lead to heart failure, arrhythmias, and blood clots inside the heart.
Heart Failure: Heart failure is a clinical syndrome in which the heart cannot pump enough blood to meet the body’s needs or can only do so at the cost of abnormal pressures in the heart and lungs. It may result from long-standing coronary artery disease, cardiomyopathy, valve disease, long-term high blood pressure, or other insults. Symptoms include breathlessness, fatigue, swelling, and reduced exercise tolerance. Although the term “failure” sounds final, many forms of heart failure can be stabilized or significantly improved with modern medical therapy and devices.
Congenital Heart Disease: Congenital heart disease encompasses structural abnormalities of the heart and great vessels that are present at birth. These may involve holes between chambers, abnormal valve formation, misplaced vessels, or combinations of defects. Some are detected and treated in infancy, while others are first recognized in adulthood. Congenital heart disease can alter normal blood flow patterns, strain the heart muscle, and increase the risk of arrhythmias, heart failure, and stroke, often requiring lifelong specialized follow-up.
Pericardial Issues: Pericardial issues involve the thin sac, called the pericardium, that surrounds the heart. Inflammation of this sac, known as pericarditis, can cause sharp chest pain and fluid accumulation. Scarring or thickening can lead to constrictive pericarditis, in which the stiffened sac restricts the heart’s ability to fill properly. Pericardial diseases can mimic other cardiac conditions and may require anti-inflammatory therapy, pericardial fluid drainage, or, in severe cases, surgical removal of the constricting tissue.

Complications of this condition

What are the most common complications of heart disease?

Some forms of heart disease stay quiet for years, while others quickly lead to new problems in the heart and throughout the body. As blood flow becomes less reliable and pressure and oxygen levels become harder to control, other organs begin to carry the strain. Many of the complications listed below are serious or life-threatening; therefore, each has its own dedicated topic in this resource. Recognizing how they connect to heart disease can help patients and clinicians think in terms of patterns rather than isolated events.

Heart Attack: A heart attack occurs when a coronary artery suddenly becomes blocked, and part of the heart muscle loses its blood supply. This typically occurs when an atherosclerotic plaque ruptures and a thrombus forms on its surface. People with coronary artery disease, long-standing high blood pressure, high cholesterol, or diabetes are at higher risk. A heart attack is a major endpoint of untreated or undertreated heart disease and has its own detailed discussion about warning signs, emergency response, and long-term management.
Heart Failure: Heart failure develops when the heart muscle cannot pump enough blood forward or cannot fill properly between beats. It often arises after years of coronary disease, uncontrolled high blood pressure, valve problems, or cardiomyopathy. Symptoms include breathlessness, swelling, fatigue, and reduced exercise tolerance. Because heart failure is a common and serious consequence of many different heart conditions, it is addressed in depth as its own condition with specific diagnostic criteria and treatment strategies.
Cardiomyopathy: Cardiomyopathy refers to structural and functional disease of the heart muscle itself, including dilated, hypertrophic, and restrictive forms. It can be caused by inherited gene variants, long-term high blood pressure, previous heart attacks, infections, toxins, or autoimmune and metabolic disorders. Cardiomyopathy increases the risk of heart failure, arrhythmias, and blood clots inside the heart. Given its distinct causes, testing, and treatment options, cardiomyopathy is considered and managed as a separate diagnostic category.
Stroke: Stroke occurs when blood flow to part of the brain is abruptly interrupted, or a blood vessel in the brain bleeds. Heart disease contributes to stroke risk in several ways, including atrial fibrillation that allows clots to form in the heart, atherosclerosis in the carotid or cerebral arteries, and weak heart pumping that promotes clot formation. Because stroke can cause sudden loss of speech, movement, or vision and requires rapid emergency treatment, it is covered in its own section focusing on warning signs, acute care, and recovery.
Abnormal Heart Rhythms: Abnormal heart rhythms, or arrhythmias, arise when the heart’s electrical system is disrupted. Coronary artery disease, cardiomyopathy, valve disease, and scarring from prior heart attacks can all destabilize electrical pathways. Arrhythmias range from relatively benign extra beats to serious conditions that cause fainting, stroke, or cardiac arrest. The evaluation and treatment of specific rhythm problems, such as atrial fibrillation, supraventricular tachycardia, and ventricular arrhythmias, each warrant a separate, detailed discussion.
Cardiogenic Shock: Cardiogenic shock is a state in which the heart suddenly cannot pump enough blood to maintain blood pressure and perfusion of vital organs. It most commonly follows a large heart attack but can also occur in severe cardiomyopathy or acute valve failure. Symptoms include rapid breathing, cold, clammy skin, confusion, and very low blood pressure. Because cardiogenic shock is a medical emergency with specific protocols for diagnosis and advanced support, it is addressed as its own critical care topic.
Cardiac Arrest: Cardiac arrest means that the heart abruptly stops pumping effectively, usually due to a chaotic rhythm such as ventricular fibrillation. Underlying coronary artery disease, cardiomyopathy, inherited electrical disorders, and heart failure all increase the likelihood of this event. Cardiac arrest is immediately life-threatening and requires prompt cardiopulmonary resuscitation and defibrillation. Separate articles focus on recognition, emergency response, and strategies for preventing recurrent arrest in high-risk patients.
Heart Valve Disease: Heart valve disease can develop as a primary problem or as a downstream consequence of other heart conditions. For example, long-standing high blood pressure or heart failure can stretch the heart chambers and prevent valves from closing properly, while previous infections or congenital defects can damage valve leaflets directly. Valve disease alters blood flow through the heart and can increase the workload on already stressed muscle. Because diagnosis and treatment vary by valve type and mechanism, valve disorders are reviewed in dedicated sections.
Pulmonary Hypertension: Pulmonary hypertension refers to abnormally high blood pressure in the arteries that carry blood from the heart to the lungs. Left-sided heart disease, including heart failure and valve problems, is one of the most common causes. Over time, elevated pressures in the lung circulation strain the right side of the heart and can lead to right-sided failure. Pulmonary hypertension has multiple subtypes, each with specific evaluation and management approaches, so it is treated as an independent condition within this resource.
Damage to the Kidneys or Liver: Chronic heart disease, particularly heart failure and recurrent low-output states, can reduce blood flow to the kidneys and liver or cause venous congestion in these organs. This can lead to kidney dysfunction, fluid and electrolyte imbalance, and liver injury or scarring. Because kidney and liver health strongly influence medication choices, prognosis, and transplant eligibility, renal and hepatic complications of heart disease are discussed separately with attention to testing, monitoring, and shared management between specialties.

Diagnosis and Testing

How do clinicians diagnose heart disease?

Clinicians diagnose heart disease by putting together several strands of information: your symptoms, risk factors, and physical exam findings, followed by targeted tests that evaluate the heart’s structure, blood flow, and electrical activity. They will ask about chest discomfort, breathlessness, palpitations, swelling, fainting, exercise tolerance, and family history of heart problems or sudden death. Blood pressure, heart sounds, lung sounds, and signs of fluid overload or poor circulation are examined carefully. From there, they select tests that answer specific questions, such as whether the rhythm is stable, whether the arteries are narrowed, or whether the heart muscle is weak. Each of the core tests below has its own detailed article in this resource, because understanding what a given test can and cannot show helps patients interpret results more confidently and ask better questions.

Electrocardiogram (EKG or ECG): An electrocardiogram records the heart’s electrical activity through small stickers placed on the skin. It can reveal abnormal rhythms, evidence of current or prior heart attacks, conduction system blocks, and patterns that suggest thickened or strained heart muscle. Because it is quick, painless, and widely available, the ECG is often the first test performed when heart disease is suspected, and it is discussed in depth in its own section on rhythm and conduction assessment.

Ambulatory Monitors: Ambulatory monitors, such as Holter monitors, event recorders, or patch monitors, record heart rhythms over hours to weeks while you go about your daily life. They are especially useful when palpitations, dizziness, or fainting spells occur intermittently and are not captured by a brief clinic ECG. These devices help determine whether symptoms coincide with arrhythmias like atrial fibrillation, pauses, or rapid heartbeats, and are covered in a dedicated article on extended rhythm monitoring.

Echocardiogram: An echocardiogram uses ultrasound to create moving images of the beating heart. It shows chamber size, wall thickness, pumping strength (ejection fraction), valve structure and function, and pressures in parts of the circulation. Echocardiography is central to diagnosing valve disease, cardiomyopathy, heart failure, and some congenital abnormalities. Because of its central role in assessing structure and function, cardiac ultrasound is explained in detail in a separate section.

Cardiac Computed Tomography (CT): Cardiac CT uses X-rays and computer processing to produce detailed cross-sectional images of the heart and coronary arteries. It can show calcium buildup in the coronary arteries (calcium scoring), visualize plaque and narrowing, and assess the aorta and surrounding structures. Cardiac CT is particularly valuable when clinicians need to clarify coronary anatomy noninvasively or plan procedures, and it has its own article that reviews indications, preparation, and the interpretation of calcium scores and CT angiograms.

Cardiac Magnetic Resonance Imaging (MRI): Cardiac MRI uses powerful magnets and radio waves to generate high-resolution images of the heart's structure and tissue characteristics without ionizing radiation. It can measure chamber volumes and function precisely, characterize scar and inflammation in the heart muscle, and help distinguish different types of cardiomyopathy or myocarditis. Because it provides information that other tests cannot, cardiac MRI is discussed in a dedicated section on advanced imaging for cardiomyopathy, congenital heart disease, and inflammatory conditions.

Blood Tests For Cholesterol and Other Markers: Blood tests are used to measure cholesterol, triglycerides, blood glucose, kidney function, cardiac troponin, and cardiac troponin I; they may also include biomarkers such as natriuretic peptides or high-sensitivity troponin. Lipid levels help estimate long-term risk and guide preventive therapy, while cardiac enzymes and troponin help diagnose acute heart injury. These laboratory tests are further explained in individual articles on cholesterol management, biomarker testing, and the evaluation of chest pain and heart failure.

Stress Testing: Stress tests evaluate how the heart responds to increased workload, either through exercise or medications that safely mimic exercise. Clinicians monitor ECG changes, blood pressure, symptoms, and sometimes imaging (such as stress echo or nuclear perfusion scans) while the heart rate is elevated. Stress testing helps uncover coronary artery disease that may not be apparent at rest and is discussed in detail in a separate article on exercise and pharmacologic stress evaluation.

Cardiac Catheterization: Cardiac catheterization involves threading a thin tube through an artery or vein into the heart and coronary arteries to measure pressures and inject contrast dye for X-ray imaging (coronary angiography). It is the definitive test for identifying blockages that may require stents or surgery, and can also assess valve function and pressures within the heart and lungs. Because it is more invasive and can be combined with treatments such as angioplasty and stenting, cardiac catheterization and coronary angiography are covered in a separate, comprehensive section on invasive coronary and hemodynamic assessment.

Management and Treatment

How is heart disease treated?

Heart disease treatment plans are tailored to the specific diagnosis, the severity of the disease, and a person’s overall health and goals. In practice, most people benefit from a layered approach that combines daily lifestyle changes, medicines that control risk factors and symptoms, and, when necessary, procedures or surgery to restore blood flow, correct rhythm problems, or repair structural defects. These steps are not interchangeable. They work together, and the plan usually evolves over time as test results, symptoms, and life circumstances change.

Lifestyle Changes: Lifestyle measures form the foundation of treatment for most types of heart disease. These include stopping all tobacco use, limiting exposure to secondhand smoke, choosing eating patterns that reduce sodium, saturated fat, and added sugars, and building regular physical activity into most days of the week at a level that is safe for your heart. For some individuals, this means starting with short, supervised walks and gradually increasing the duration and intensity. For others, it means fine-tuning an existing exercise routine, addressing sleep apnea, or reducing alcohol intake. These changes lower blood pressure, improve cholesterol and blood sugar, support weight management, and reduce the burden on the heart over the long term.
Medicines: Medicines are used to control blood pressure, cholesterol, heart rate, rhythm, fluid balance, and blood clotting, depending on the condition. Common examples include drugs that block the renin–angiotensin system, such as ACE inhibitors or ARBs; beta blockers that slow and protect the heart; diuretics that reduce congestion; statins and other lipid therapies that stabilize plaque; antiplatelet agents or anticoagulants that reduce thrombosis risk; and rhythm drugs for specific arrhythmias. Many of these therapies reduce the risk of heart attack, stroke, and hospitalization in ways that are not always felt day to day. Taking them exactly as prescribed and discussing side effects early, rather than stopping on your own, is central to effective treatment.
Procedures and Devices: Some forms of heart disease require procedures for complete treatment. Examples include coronary angioplasty and stenting for narrowed arteries, coronary bypass surgery for complex blockages, valve repair or replacement for severe valve disease, catheter ablation for certain arrhythmias, and device implantation, such as pacemakers or defibrillators, for pacing or sudden death prevention. Less invasive catheter techniques are increasingly available for selected valve and structural problems. The choice between procedure types depends on the location and severity of disease, other medical conditions, and patient preferences, and is usually made after detailed discussion with a cardiologist and, when needed, a cardiac surgeon or electrophysiologist.
Cardiac Rehabilitation: Cardiac rehabilitation is a structured, supervised program that combines monitored exercise, education about heart-healthy living, and support for emotional recovery after events such as a heart attack, angioplasty, bypass surgery, or a new heart failure diagnosis. These programs help people rebuild strength safely, refine their medicines and activity plans, manage risk factors more effectively, and address fear or low mood that often follow serious heart problems. Participation in cardiac rehabilitation has been shown to reduce rehospitalization and improve survival, which is why it is considered a core component of treatment rather than an optional add-on when available.

Recovery Time

How long does it usually take to recover from heart procedures?

Recovery time varies widely depending on the type of treatment and on someone’s baseline health. Many diagnostic procedures, such as coronary angiography without intervention, require only a short observation period and a few days of activity restrictions. Minimally invasive catheter procedures and some valve interventions often allow patients to go home within one or two days and gradually return to usual activities over the next couple of weeks. Open-heart surgeries, such as bypass or major valve operations, usually require a longer hospital stay and a recovery period measured in weeks, with full strength and confidence sometimes taking several months. Throughout recovery, clinicians closely monitor wound healing, symptoms such as chest pain or shortness of breath, changes in weight or swelling, mood, and sleep, and adjust medications and activity levels accordingly. Clear discharge instructions and early follow-up visits are essential parts of this process.

Seeking Care

When should I see my healthcare provider about heart disease?

If you have a strong family history of heart disease, known risk factors such as high blood pressure, high cholesterol, diabetes, smoking, or kidney disease, or if you have been told you have an abnormal heart sound or rhythm in the past, it is worth speaking with your primary care clinician or cardiologist about your personal risk and whether additional testing or preventive treatment is appropriate. New symptoms such as chest pressure or discomfort, unexplained shortness of breath, palpitations, fainting, swelling in the legs or abdomen, or a sudden drop in exercise capacity should always prompt a call to your provider. Sudden severe chest pressure, heaviness, or discomfort, especially if it radiates to the arm, jaw, or back, or comes with sweating, nausea, or shortness of breath, should be treated as an emergency, and you should call your local emergency number rather than waiting for an office appointment.

When you do see your clinician, you may find it helpful to ask specific questions such as:

What type of heart disease do I have, and which part of my heart is affected?
How advanced is it, and what tests do we still need to clarify the diagnosis?
What are the goals of treatment in my case, and how will we know if we are meeting them?
Are my family members at higher risk because of my diagnosis, and should they be screened?
How often should I follow up, and which symptoms should make me contact you sooner than planned?
Bringing a written list of questions and, when possible, a trusted family member or friend can help you remember what was discussed and feel more confident about the plan you and your team decide on together.

The IWBCA provides the information and materials on this site for educational and informational purposes only. The content is not a substitute for professional medical evaluation, diagnosis, or treatment. Always consult your physician or another qualified healthcare provider regarding any questions you may have about a medical condition, diagnosis, or course of treatment. Do not disregard, delay, or alter medical advice based on information obtained from this site. If you believe you are experiencing a medical emergency, call 911 or your local emergency services immediately.