Gastritis n. : Inflammation of the stomach, esp. of its mucuos membrane.

Example:
What's the difference between nausea due to pregnancy and due to Gastritis?

Taxonomy
gastritis, stomach, pain, symptoms, chronic gastritis, inflammation, Treatment, proton pump inhibitors, 11-18, stomach lining, Gastritis Symptoms, H. pylori, medications, NSAIDs, upper abdomen, free encyclopedia, infection, Erosive gastritis.

Defination from the web:
gastritis develops after major surgery, traumatic injury, burns, or severe infections. Gastritis may also occur in those who have had weight loss surgery resulting in the banding or reconstruction of the digestive tract. ...