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Heartburn or heart attack: When to worry - Mayo Clinic
Heart attack symptoms: Know what's a medical emergency
Heartburn - Symptoms & causes - Mayo Clinic
Heart attack - Symptoms & causes - Mayo Clinic
Gastroesophageal reflux disease (GERD) - Symptoms and causes
Heart attack: First aid - Mayo Clinic
Heartburn - Diagnosis & treatment - Mayo Clinic
Silent heart attack: What are the risks? - Mayo Clinic
Esophageal spasms - Symptoms and causes - Mayo Clinic
Symptoms and causes - Mayo Clinic