A heart attack happens when the blood supply is cut off from the heart muscle, usually because of a blood clot. Without blood and oxygen, the muscle cells are damaged and die.

When you have heart block, there is interference with the electrical signals that usually move from the top chambers of your heart to the bottom chambers, telling your heart when to beat. Read on to learn about causes, symptoms, and ...

Heart failure is a condition in which the heart cannot pump enough blood to meet the body's needs.

Heart failure is when the heart can't pump enough blood to the body. In children, it is often caused by a congenital heart defect.

Heart murmurs may be caused by a number of factors or diseases, including defective heart valves, fever, and pregnancy. Read on to learn more about this condition.

Heart murmurs are extra or unusual sounds made by blood moving through the heart. Many children have heart murmurs. Some cause no problems or go away over time. Others require treatment.

Heart valves can malfunction on one of two ways: They can fail to close completely, allowing blood to flow backward, or they can become damaged, limiting blood flow.

Blood pressure is the force of the blood pushing against the artery walls. High blood pressure (hypertension) means that the pressure inside the arteries is too high. This higher pressure may harm the arteries and cause the heart to work...

High blood pressure, or hypertension, increases the risk for coronary heart disease (heart attack) and stroke (brain attack). Read on for details about this condition.

High blood pressure, or hypertension, increases the risk for coronary heart disease (heart attack) and stroke (brain attack). Read on for details about this condition.

The Holter monitor is a type of electrocardiogram (ECG) used to record an ECG tracing of the heart continuously for 24 hours or longer.

Hypertrophic cardiomyopathy, or HCM, is a disease that causes thickening (hypertrophy) of the heart muscle. The heart cells enlarge more than they should and scarring is often found between the cells.

Hypoplastic left heart syndrome (HLHS) is a group of defects of the heart and large blood vessels. A child is born with this condition (congenital heart defect). It occurs when part of the heart doesn't develop as it should during the ...