Gastritis alone is not fatal, but it needs to be treated differently because some gastritis can develop erosion, bleeding, chemosis, and possibly even ulcers, or because of invasion of small veins and arteries, there is a possibility of hemorrhage. Patients with gastritis simply because of gastritis may not necessarily have any particular life-threatening condition, but there is a great concern that it may gradually transform into ulcers, malignant ulcers, or even early gastric cancer, or even mid- to late-stage gastric cancer, etc., due to complications or gradual prolongation of the condition without proper intervention.　Therefore, it is important to pay attention to similar cases and to treat them early. If there is H. pylori infection, sterilization treatment is also recommended to prevent further progression of the disease. So simple gastritis is not going to cause death, some complications need to be noted.