A heart attack happens when there is a sudden complete blockage of an artery that supplies blood to an area of the heart. A heart attack occurs when a blood clot completely blocks the flow of blood and seriously reduces blood flow to the heart muscle. This also results in patients experiencing excruciating chest pain. A heart attack is also called myocardial infarction (MI), acute myocardial infarction, coronary occlusion or coronary thrombosis. Heart attack warning signs can vary from person to person, and they may not always be sudden or severe, but will often include pain in the chest, upper body pain, sweating, nausea, fatigue, and trouble breathing. For regular health and heart, checkups schedule a visit with us.