A heart attack occurs when the blood flow to a section of the heart muscle is blocked, severely damaging the muscles. There are several reasons for a blockage, from plaque built up in the coronary arteries to blood clots. Heart attacks are one of the leading causes of death worldwide. So, understanding the causes, symptoms, treatment, and prevention of heart attacks is crucial for individuals to protect their heart health and reduce the risk of this life-threatening condition. Causes or risk factors of heart attack Narrowed arteries When arteries progressively harden or narrow over time, it can lead to a heart attack. Coronary artery disease (CAD) develops when a fatty deposit called plaque begins to build up on artery walls, narrowing or blocking them. Blood clots It is possible for blood clots to develop in the arteries that supply the heart with necessary oxygen and nutrients. If a clot completely blocks blood flow, it can lead to a heart attack. Spasms In some cases, the coronary arteries can suddenly spasm and temporarily narrow or close. This can reduce blood flow and trigger a heart attack. Sedentary lifestyle Even those who are not currently at risk may weaken their heart muscles due to a lack of physical activity.