What condition involves inflammation of the stomach lining?

The condition that involves inflammation of the stomach lining is gastritis. This medical issue can result from various factors, including prolonged use of nonsteroidal anti-inflammatory drugs (NSAIDs), excessive alcohol consumption, stress, or infections, particularly by the bacterium Helicobacter pylori. Symptoms of gastritis may include abdominal pain, nausea, vomiting, and indigestion.

In contrast, appendicitis is the inflammation of the appendix, a small pouch attached to the large intestine, typically presenting with right lower abdominal pain. Cholecystitis refers to inflammation of the gallbladder, often due to gallstones, which leads to pain in the upper right abdomen. Diverticulitis involves inflammation or infection of diverticula in the colon, usually presenting with lower abdominal pain and changes in bowel habits. These distinctions clarify why gastritis is the correct answer in the context of inflammation of the stomach lining.