Original Article: http://www.mayoclinic.com/health/medical/IM00938
- Heart attack
A heart attack occurs when an artery supplying your heart with blood and oxygen becomes blocked. Fatty deposits build up over time, forming plaques in your heart's arteries. If a plaque ruptures, a blood clot can form and block your arteries, causing a heart attack. During a heart attack, tissue in your heart muscle dies due to lack of blood flow through your heart's arteries.