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The heart, blood and blood vessels work together to service the cells of the body.

Giant cell arteritis is inflammation of the arteries that can cause sudden blindness in one or both eyes.

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

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.

Hypertension, or high blood pressure, can increase your risk of heart attack, kidney failure and stroke.

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

Smoking is thought to be a factor in age-related macular degeneration and blindness.

A smoker's excess risk of heart attack reduces rapidly after only one year of not smoking.

Angina attacks can be prompted by exertion or physical exercise, when the hard-working heart muscle requires greater amounts of oxygen.

An enlarged heart isn't a condition in itself, but a symptom of an underlying problem that is causing the heart to work harder than normal.