When gastritis is present, symptoms such as abdominal pain, acid reflux, belching, and bloating typically occur. Clinically, one can register under the Gastroenterology department, as the stomach is part of the digestive system. If the hospital is small and lacks a Gastroenterology department, registering under the Internal Medicine department could be considered. For gastritis diagnosis, registration should be made under Gastroenterology, and examinations such as gastroscopy and tests for Helicobacter pylori are required. Both gastroscopy and Helicobacter pylori tests require fasting for more accurate results. Moreover, treatment in Gastroenterology is more targeted.