Stable angina has a typical pattern. You can likely predict when it will happen. It happens when your heart is working harder and needs more oxygen, such as during exercise. Symptoms go away when you rest or take nitroglycerin.
Unstable angina is a change in your usual pattern of stable angina. It is a warning sign that a heart attack may soon occur. It is an emergency.
Some people don't have any symptoms. This is called "silent ischemia." In rare cases, you can even have a "silent heart attack," a heart attack without symptoms.
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WebMD Medical Reference from Healthwise
September 30, 2014
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