Inflammation of both the stomach and the duodenum, usually caused by infection or irritation.
From 'gastro-' (stomach) + 'duodenal' + '-itis' (inflammation). The suffix '-itis' comes from Greek and is the standard medical way to indicate inflammation of a body part.
When a stomach ulcer eats through to the duodenum, or when gastroenteritis hits both regions, doctors use this term—it's actually pretty common but sounds scary because it's such a long word!
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