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​Symptoms and Signs-Differential Diagnosis of Hypergastrinemia
• Rheumatoid arthritis (RA)
• Pyloric obstruction
• Hypochlorhydria due to atrophic gastritis, gastric carcinoma,pernicious anemia 
• Hyperplasia of antral G cells
• Gastrinoma (Zollinger-Ellison syndrome)
• Decreased gastrin release inhibition from medications (proton pump inhibitors [PPIs], H2 receptor antagonists), vagotomy 
• Chronic renal failure
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