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  1. Peptic ulcer - Symptoms and causes - Mayo Clinic

  2. Peptic ulcer - Diagnosis and treatment - Mayo Clinic

  3. Helicobacter pylori (H. pylori) infection - Symptoms & causes

  4. Gastritis - Symptoms and causes - Mayo Clinic

  5. Stomach cancer - Symptoms and causes - Mayo Clinic

  6. Gastrointestinal bleeding - Symptoms and causes - Mayo Clinic

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

  8. What causes gastrointestinal bleeding and how serious is it really ...

  9. Ulcerative colitis - Symptoms and causes - Mayo Clinic

  10. Mayo Clinic Q and A: How is a peptic ulcer treated?