Gastroscopy is the primary and most reliable method of diagnosing gastritis, but gastritis does not necessarily require a gastroscopy. There are several other tests that can diagnose gastritis: 1. Barium meal imaging of the upper gastrointestinal tract, which mainly involves mixing a barium meal contrast agent into a paste and drinking it into the upper gastrointestinal tract. The contrast agent is attached to the mucosa of the gastrointestinal tract, and the esophageal mucosa is observed through X-ray gastrointestinal remote control agents, as well as the absence of defects in the gastric mucosa, the presence of occupancy and the smoothness of the mucosa, etc. It is a common test for diagnosing gastritis. 2. Gastric fluid analysis, which mainly involves pumping the This is a common test for the diagnosis of gastritis. 2) Gastric fluid analysis, which involves drawing gastric fluid from the stomach through a gastric tube, observing the concentration of gastric fluid, and testing the pH of gastric fluid, is used to differentiate chronic superficial gastritis from chronic atrophic gastritis. 3) Serum marker tests, which involve the measurement of serum mural cell antibodies and serum gastrin, are used to differentiate gastric body gastritis from gastric sinus gastritis. These tests are mainly used for patients with mild lesions, poor medical conditions, and patients who are too weak to undergo gastroscopy.