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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.
The symptoms of stable angina are different from those of unstable angina. Stable angina occurs at predictable times with a specific amount of exertion or activity and may continue without much change for years. It is relieved by rest or nitrates (nitroglycerin) and usually lasts less than 5 minutes.nstable angina symptoms are similar to a heart attack. Call 911 or other emergency services immediately if you think you are having a heart attack or unstable angina. People who have unstable angina often describe their symptoms as: 1  Starting within the past 2 months and becoming more severe.