Coronary Artery Disease, or CAD:
A blockage in the heart blood vessels that reduces blood flow and oxygen to the heart muscle itself. This can cause pain known as angina. It's a symptom of heart disease but typically does not cause permanent damage to the heart. It is, though, a sign that you are a candidate for a heart attack at some point in the future. The chest pain may spread to your arm, shoulder, jaw, or back. It may feel like a pressure or squeezing sensation.
Typical angina can be triggered by exercise, excitement, or emotional distress and is relieved by rest. If something changes in the blood vessels angina can occur at rest, even leading to a heart attack. Chest pain at rest or on minimal exertion is one of the commonest reasons for admission to hospital and makes up a large proportion of my work as cardiologist and interventionalist.