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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.
There are different types of angina: Stable angina is the most common. Physical activity or stress can trigger it. It usually lasts a few minutes, and it goes away when you rest. It isn't a heart attack, but it can be a sign that you're more likely to have one. Tell your doctor if this happens to you. Unstable angina.