Massive chest pain. Shortness of breath. It feels as if there's an elephant crushing your chest. The pain may radiate to the left arm and/or the jaw.
A heart attack is the layman's term for a myocardial infarction, which is damage to the heart caused by a blocked coronary artery resulting in an area of heart muscle becoming starved of oxygen and nutrients.
This is one of the biggest causes of death worldwide.