There is no connection. Celiac disease patients, when untreated, often have gastritis, but its features are clearly different from and unrelated to the gastritis caused by H. pylori.(Updated .)
Is gastritis sometimes associated with celiac disease?
Yes. Approximately 50-60% of celiacs have, at the time of diagnosis, a lymphocytic gastritis (infiltration of these specific white blood cells called lymphocytes into the superficial layers of the stomach). However, this is rarely the cause of symptoms and promptly regresses on a gluten-free diet.(Updated .)