We will encounter some patients with gastritis in the clinic who have recurrent episodes despite systematic treatment and have neither H. pylori infection nor pancreatic disease. At this time, a routine blood test is required, and if eosinophilia is found, the diagnosis of eosinophilic gastritis can be initially considered. Eosinophilic gastritis is a gastrointestinal disease characterized by an increase in peripheral blood eosinophils. The gastrointestinal tract can be infiltrated with eosinophils to varying degrees, and the etiology is unclear and is associated with allergic reactions, parasitic infections, etc. It responds well to glucocorticoid therapy. Clinical symptoms and signs depend on the depth of infiltration of the gastric wall and the presence or absence of lesions in the esophagus, small intestine and colon, and can be clinically classified into 3 types. Mucosal type: common symptoms include nausea, vomiting, abdominal pain, diarrhea, low back pain, which can be aggravated by eating special allergic foods; muscular type: mainly manifests as nausea, vomiting, abdominal pain, which is difficult to be relieved by antacids or anticholinergics. Plasma membrane type: ascites may appear, and eosinophils are increased in ascites.