Question

why do heart attack occurs and how it occurs?

Answer 1

A heart attack happens if the flow of oxygen-rich blood to a section of heartmuscle suddenly becomes blocked and the heart can't get oxygen. Most heart attacks occur as a result of coronary heart disease(CHD). CHD is a condition in which a waxy substance called plaque builds up inside of the coronary arteries.

Answer 2

A heart attack is a medical emergency. A heart attack usually occurs when a blood clot blocks blood flow to the heart. Without blood, tissue loses oxygen and dies.