Gastritis and gastroenteritis are commonly treated in the gastroenterology department in a clinical setting, as this department is well-equipped to diagnose and treat gastrointestinal diseases and possesses significant clinical experience. In smaller hospitals or those without a gastroenterology department, it’s typical to visit the internal medicine department instead. However, in formal hospitals, gastroenterology is the preferred choice; if unavailable, then internal medicine should be considered. Additionally, it is essential to be fasting for examinations of gastritis and gastroenteritis, as blood tests and ultrasound scans, both requiring fasting, are needed.