noun
a medical condition characterized by inflammation or irritation of the lining of the stomach
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Gastritis is a medical condition characterized by inflammation of the lining of the stomach.
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I heard that John has been diagnosed with gastritis and has to be careful with his diet.
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My stomach has been acting up lately, I think I might have a bit of gastritis.
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Dealing with all the stress at work feels like a constant case of gastritis in my gut.