Angina: The pain in the chest that forewarns a heart attack

Stable angina can be treated with rest or nitrate medications; however, unstable angina is a medical emergency as it can lead to a heart attack. — 123rf

Angina pectoris, often shortened to angina, is chest pain or discomfort caused by reduced blood flow to the heart.

It is most commonly, but not always, a symptom of coronary artery disease (CAD).