To determine if you have gastritis, there are two main aspects to start with. According to the presence of clinical symptoms, the symptoms of chronic gastritis are mainly pain in the upper abdomen, which is located above the navel and below the glabella. The pain is usually paroxysmal, mainly vague and sometimes accompanied by pain at night, and some patients may have significant pain before or after meals. In addition to this, it is accompanied by heartburn, belching, acid reflux, epigastric fullness, and in severe cases, nausea and vomiting. The endoscopic manifestation of the gastric mucosa can also be seen. If there is congestion and edema in the gastric mucosa, scattered bleeding spots or submucosal bleeding spots, edema of the gastric wall, etc. suggesting inflammation of the gastric mucosa, then H. pylori testing is needed to observe whether there is H. pylori infection, and the clinical manifestation as well as the endoscopic manifestation can basically determine whether there is chronic gastritis.