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Some congenital heart defects are mild and cause no significant disturbance to the way the heart functions.

The heart is about the size of a clenched fist and lies in the middle of your chest, behind and slightly to the left of your breastbone.

Although blocked blood vessels can cause both coronary heart disease and some types of stroke, stroke is not the same as heart disease.

Folic acid taken before conception, and during at least the first 4 weeks of pregnancy, can prevent around 7 out of 10 cases of neural tube defects.

A heart that beats irregularly, too fast or too slow, is experiencing an arrhythmia.

Some children acquire a heart problem after an illness in childhood, and this is called an acquired heart defect.

Heart failure is a condition where the heart muscle doesn’t pump blood to the rest of the body as well as it should.

Pulmonary hypertension is high blood pressure on the lungs.