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  1. Heartburn or heart attack: When to worry - Mayo Clinic

  2. Heartburn - Symptoms & causes - Mayo Clinic

  3. Sudden Heartburn: Causes, Signs It’s Serious, Relief

  4. Gastroesophageal reflux disease (GERD) - Symptoms and causes

  5. Severe Heartburn: Guide to Managing Chronic Symptoms

  6. Heartburn: What It Feels Like, Causes & Treatment

  7. Heartburn: Causes, Symptoms, and Treatment - WebMD