Gastritis is not the same as gastric ulcer. Gastritis is caused by the presence of congestion and edema in the gastric mucosa, and the lesions are limited to the surface of the gastric mucosa and do not invade the muscular layer of the gastric wall, thus causing relatively little impact on the stomach. Most people will show symptoms such as epigastric pain, acid reflux, belching and so on during the period of illness. The pain caused by gastritis is not regular and can come on at irregular intervals, especially when eating irritating foods. Gastric ulcers can be found in various parts of the patient’s stomach, and there is an ulcerated surface on the gastric mucosa during the attack, which will gradually deepen and expand, and even invade the muscle layer of the stomach. Gastric ulcers are accompanied by pain in the stomach, and the pain is relatively severe and regular, mainly occurring about one hour after eating, which is directly related to the stimulation of the ulcer surface by gastric acid.