They 'don't have time' to be sick. They think it's the flu or indigestion. They think it can't happen to them. They are only the excuses we've heard most often. Perhaps the most common is that people simply decide to 'wait and see' how it goes, hoping they'll feel better later.
Some people wait days before seeking medical help.
Others may never seek help at all. Meanwhile, a blockage in their blood flow is causing damage to their hearts. Unless treatment starts quickly, this destructive process will continue. A heart attack runs the gamut from mild to so severe that the person dies. There's a continuum.