Diffuse gastritis refers to a more diffuse and extensive lesion of gastritis. In similar cases, the presence of gastric body inflammation, gastric sinusitis and inflammatory manifestations associated with the fundus of the stomach are mostly considered. The mucosa can be seen under the gastroscope as a reddish-white, predominantly red manifestation. Note that under gastroscopy, it is important to exclude the presence of small ulcers of erosion and atrophy, or even small bleeding spots, etc. It is recommended that if necessary, a mucosal biopsy must be performed to exclude other related conditions. Patients with similar conditions are advised to pay attention to dietary adjustments, pay attention to light and easy digestion, and to check for H. pylori. Because the infection of this bacterium may cause aggravation of gastritis, it is necessary to combine the situation with sterilization treatment.