Fatty plaque builds up inside the layers of your heart’s pipes, causing them to become narrowed or blocked. This can stop the blood flow to the heart muscle, causing a heart attack.
If you have heart valve disease it means your heart's valves can't open or close as well as they should.
If your heart beats too fast, too slow or not in a regular rhythm, there may be a problem with your heart’s electrical system.
Some diseases can cause your heart's pump to become weak, which is called heart failure.
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