Helicobacter pylori of the stomach is a bacterium that lives in the sinus of the stomach. The bacterium lives in the sinus of the stomach, and it is in the location of the pyloric opening of the sinus, so it is called H. pylori. It is called H. pylori because it is in the shape of a rod, just like a stick. And this bacteria sometimes into a rod, and sometimes into a spiral, so it is called Helicobacter pylori. According to its characteristics, it is artificially designated as H. pylori. At the current stage of scientific development, many patients with gastric ulcer and most patients with gastric cancer have H. pylori infection, and if H. pylori is killed, basically gastric ulcer will not recur. Therefore, for this bacteria, carbon 13 or carbon 14 breath test or urease staining test is needed to detect the presence of H. pylori infection, and active treatment of H. pylori is an important factor to prevent gastric ulcer and even gastric cancer from occurring.