What is the difference between grastitis and gastroenteritis?

Itis=inflammation: Gastritis is inflammation of stomach lining and can be serious. Gastroenteritis is inflammation as well but usually due to a virus and self limiting, i.e., is resolves on its own with light diet and clear liquid diet. When abdominal symptoms of diarrhea, vomiting or heartburn and abdominal pain persist, you need to see your doctor for physical and possibly further tests.