When we come for gastroscopy, it is to observe the esophagus and stomach, as well as the duodenum, to see if there are any mucosal erosions, abnormal hyperplasia, bulging, and peptic ulcers. If gastroscopy reveals that the mucosa has erosions, which are different from the normal mucosal manifestations, or peptic ulcers, or abnormal elevations, or irregular hyperplasia of the mucosa, then a biopsy is needed in order to clarify the nature of the lesion. The biopsy is performed under the gastroscope, then through the biopsy orifice, into the biopsy forceps, biopsy forceps forceps biopsy tissue, and then sent to the Department of Pathology for examination. The specimen taken out is judged to see if there are any abnormal cells or obvious abnormalities. Sometimes, in order to determine whether there is H. pylori infection, it is also necessary to use gastroscopy biopsy, biopsy biopsy tissue to do rapid urease test. If the rapid urease test is positive, it suggests that there is H. pylori infection in the stomach.