Angina pectoris - or simply angina - is chest pain or discomfort that keeps coming back. It happens when some part of your heart does not get enough blood and oxygen.

An anomalous coronary artery (ACA) is a heart defect. This is something your baby is born with (congenital). In ACA, the blood vessels that supply blood to your child’s heart muscle aren’t normal.

Aortic stenosis means that your child has a heart valve that is too narrow or is blocked. The aortic valve is 1 of 4 heart valves that keep blood flowing through the heart. The valves make sure blood flows in only one direction. The ...

Aortic valve regurgitation is when a person's aortic valve leaks. The aortic valve is one of the heart's 4 valves. These valves help the blood flow through the heart and out to the body. Normally, the aortic valve stops blood from ...

An arrhythmia is an abnormal heart rhythm that can cause problems with the contractions of your heart chambers.

Arrhythmogenic right ventricular dysplasia (or ARVD) is a disease of the heart muscle. In this disease, fatty fibrous tissue replaces normal heart muscle. This interrupts normal electrical signals in the heart and may cause irregular and...

Atherosclerosis is when arteries get hardened and narrowed. Learn what causes it, how it harms your health, and what you can do to prevent it.

Atherosclerosis is a type of thickening or hardening of the arteries caused by a buildup of plaque in the inner lining of an artery. It can increase your risk of heart attack, stroke, and other circulatory conditions.

Atrial fibrillation is when the upper chambers of the heart don’t pump normally. Learn what happens in the heart, and how it can be managed.

Atrial flutter is when the upper chambers of the heart beat too fast. Learn how it happens, and how it can be treated.

Atrial flutter is an abnormal heart rhythm that causes the atria to beat more quickly than they should.

Bacterial endocarditis is a bacterial infection of the inner layer of the heart or the heart valves. The heart has 4 valves. These valves help the blood flow through the heart and out to the body. When a person has bacterial ...

Bacterial endocarditis is an infection of the lining of the heart (endocardium), and the heart valves. It does not happen very often, but when it does, it can cause serious heart damage.

Bicuspid aortic valve is a type of abnormality in the aortic valve in the heart. In bicuspid aortic valve, the valve has only two small parts, called leaflets, instead of the normal three. This condition is present from birth. It often ...

Brugada syndrome is a genetic disorder that causes an irregular heartbeat. This rare, but life threatening condition is more common in people of Asian descent.

A bundle branch block is an interruption of the electrical pathways inside the wall of the heart. A block in the right bundle branch can occur in people who otherwise seem normal. If it happens with a heart attack, it can be a sign of ...

Cardiac catheterization procedure can diagnose a variety of heart conditions and determine the health of your coronary arteries, heart valves, and heart muscle. View this video to learn what happens during this procedure and various ...

If you have a heart condition, your healthcare provider may recommend a cardiac rehab program to help you recover. This video tells you more about cardiac rehab and how it can help.

Cardiac sarcoma is a rare type of cancerous tumor that occurs in the heart.

An exercise cardiac stress test can help your healthcare provider find out if you have coronary artery disease (CAD). It can also show how hard you can safely exercise.

An exercise imaging stress test shows how well blood flows inside your heart and how well your heart pumps blood. It gives your healthcare provider more information than a non-imaging stress test.

Cardiac tamponade happens when extra fluid builds up in the space around the heart. This fluid puts pressure on the heart and prevents it from pumping well.

Catecholaminergic polymorphic ventricular tachycardia, or CPVT, is a rare genetic condition. It causes an irregular heart rhythm that can be life threatening. It often shows up in childhood. The first sign is often fainting or near ...

Catheter ablation can fix a cardiac arrhythmia when medicines used to treat it don’t work. The ablation stops abnormal electrical signals in your heart. This lets your normal heart rhythm take over again.

Coarctation of the aorta is a heart defect that is present at birth (congenital). It means the aorta is narrower than it should be. Read on to learn details about the condition.

Coronary artery disease (CAD) is the most common type of heart disease. CAD develops when plaque builds up in the arteries that supply blood to the heart. See if you’re at risk for CAD, and how you can help prevent it.

A person with coronary heart disease has an accumulation of fatty deposits in the coronary arteries. These deposits narrow the arteries and can decrease or block the flow of blood to the heart.

Dilated cardiomyopathy, or DCM, is when the heart chambers stretch and become thin. It often starts in the left ventricle. As the disease gets worse, it may spread to the right ventricle and to the atria. As the muscle stretches, it ...

Detailed information about double outlet right ventricle (DORV), a heart malformation that is present from birth.

Small changes in what you eat can make a big difference in your heart health. Watch and learn how easy it is to improve your health by eating right.