Coronary artery disease
If an artery becomes blocked completely, it causes serious problems. All cells, tissues, and organs in the body need oxygen and nutrients (carried by blood) to survive. If cells or tissues are not supplied with enough blood, they will die. (This is called necrosis.) When this happens in the coronary arteries, a section of the heart dies. This can cause a myocardial infarction (a heart attack) to happen.