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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.
Diagnosis of Angina. All chest pain should be checked out by a healthcare provider. If you have chest pain, your doctor will want to find out whether it's angina and if it is, whether the angina is stable or unstable. If it's unstable, you may need emergency medical treatment to try to prevent a heart attack.