What are the causes of minor heart attacks?

Stress: Any reason that will lead to stressing heart including infections, sepsis, and of course underlying coronary artery disease. Minor heart attacks are usually called demand ischemia in scientific terms.

Thoughts: Ay heart attack is potentially very serious. Arrythmias , etc some small coronary occluded and only a small amount of the cardiac muscle is damaged. Relates to remaining non ischemic good muscle to be called "minor"! but if one vessel, even small, is diseased others are likely progressing. Make good life choices. See aha get with the program.

Minor means minimal: Heart muscle damage...Plaque rupture is most common cause but this can be big or small...Highly variable.