If the blood flowing to the heart muscle is not adequate, your heart muscle will lack oxygen, leading to pain in the chest. This condition is angina.
Unstable angina is a type of angina. Unlike stable angina that occurs during exercise, it happens when you are at rest. Besides, it is more severe than stable angina.
If the pain lasts for a long period of time, such as more than ten minutes, you should call 911. It can be a sign of a heart attack and it needs timely treatments.
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