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Unstable angina causes sudden pain in the chest, arms, and back. The pain may be severe, or it may feel like pressure, an ache, or fullness in the chest. Unstable angina is a sign that blood flow to the heart has lessened dangerously and dramatically, and can be a sign that a heart attack may be imminent.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.