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Unstable angina is a signal that your arteries are becoming very narrow and that you could experience a heart attack. If left untreated, your unstable angina can lead to heart attack, heart failure, or arrhythmias (irregular heart rhythm). These can be life-threatening conditions.
Angina is pain, discomfort or pressure in the chest, and doctors usually describe it as chronic stable angina or unstable angina. 1  Chronic stable angina is a form of chest discomfort that happens when your heart is working hard and needs more oxygen, such as during exercise. 2  The pain goes away when you rest.ngina is pain, discomfort or pressure in the chest, and doctors usually describe it as chronic stable angina or unstable angina. 1  Chronic stable angina is a form of chest discomfort that happens when your heart is working hard and needs more oxygen, such as during exercise. 2  The pain goes away when you rest.