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  1. Heart attack - Symptoms & causes - Mayo Clinic

  2. Heart attack symptoms: Know what's a medical emergency

  3. Warning Signs of a Heart Attack - American Heart Association

  4. Early Warning Signs of a Heart Attack - Cleveland Clinic Health …

  5. Heart Attack: Causes, Symptoms, and Treatment - WebMD

  6. Warning Signs of a Heart Attack

  7. Heart Attack: Symptoms, Causes, Diagnosis, Prevention, More - Healthline

  8. About Heart Attack Symptoms, Risk, and Recovery

  9. Heart Attack - Symptoms - NHLBI, NIH