Great question—people mix these up a lot because they are closely related.
Big picture: Both angina and a heart attack involve the heart muscle not getting enough oxygen-rich blood. The key difference is severity and damage (whether permanent or not).
Angina (Myocardial Ischaemia)
Think of angina as a warning signal.
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What it is: Chest pain or discomfort caused by temporary reduced blood flow to the heart. The pain is usually left-sided and radiates (spreads) down the left arm.
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What’s happening: The coronary arteries are narrowed, but not completely blocked.
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Damage: ❌ No permanent heart muscle damage.
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Triggers: Usually related to exercise – also by stress, cold weather, or heavy meals.
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How it feels: Pressure, squeezing, tightness, or burning in the chest; may spread to arm, neck, jaw, or back.
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Relief: Usually improves with rest or nitroglycerin.
There’s also unstable angina, which is more serious—it can happen at rest and may signal an impending heart attack.
Heart Attack (Myocardial Infarction)
This is a medical emergency.
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What it is: Part of the heart muscle is starving and dying due to a blocked artery.
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What’s happening: A coronary artery is completely or nearly completely blocked, often by a blood clot.
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Damage: ✅ Permanent heart muscle damage can occur.
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Symptoms: Similar to angina but usually stronger, longer-lasting, and not relieved by rest
May include shortness of breath, nausea, vomiting, sweating, dizziness, or unusual fatigue. -
Needs: Immediate medical treatment to restore blood flow. Call 999 or go to A&E now.
Quick comparison
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Angina: Temporary pain, no damage, warning sign
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Heart attack: Ongoing pain, permanent damage, emergency
🚨 Important: If someone has chest pain that’s new, severe, lasts more than a few minutes, or feels different than usual—treat it like a heart attack and get emergency help. It’s always better to be wrong than late.
