Inflammation and irritation of the stomach lining characterize gastritis. This indicates that the lining is red and puffy. Erosion-like lesions may form in the stomach lining. In contrast to a minor stomach sore, an ulcer is a more serious, open wound in the stomach lining. Even the initial section of the small intestine is not immune (duodenum). In many ways, gastritis and ulcers share the same origins and manifestations.
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