Chronic gastritis diarrhea is related to improper diet, excessive secretion of gastric acid, and inflammation causing aggression to the intestinal tract. Chronic gastritis is caused by edema and congestion on the gastric mucosa, mainly with gastric pain, bloating, heartburn, acid reflux, nausea and vomiting as the main manifestations, chronic gastritis does not cause diarrhea symptoms. When patients with chronic gastritis consume a large amount of indigestible food during the illness, it will lead to an increased burden on the digestive system and even cause indigestion, which will then be accompanied by diarrhea. Some patients with chronic gastritis have excessive secretion of gastric acid, which can cause irritation to the intestinal mucosa when it enters the intestine, leading to hyperactive intestinal motility and diarrhea. Some patients with chronic gastritis will gradually aggravate their condition, and even the inflammation will gradually invade the intestine, and once the inflammation invades the intestine, it will trigger the onset of enteritis, which will also cause diarrhea symptoms.