Bad breath can be caused by many reasons, such as tooth decay and H. pylori infection, which can cause bad breath. The patient came to the clinic with the main report of stomach discomfort and felt that the gastrointestinal distension was caused by overeating over the New Year, but in fact, the patient’s stomach distension and discomfort was also caused by H. pylori infection. Related surveys show that the infection rate of H. pylori can reach 60% in the natural population. In general, the discovery of H. pylori, should be treated in a timely manner, delaying the course of the disease may cause gastric distension, atrophic gastritis, gastric ulcer and other stomach diseases, at the same time, now this H. pylori will not only exist in the stomach, but also in the intestines, mouth and other places to stay. If not controlled in time, the survey found that there is also a relationship between the rising incidence of gastric cancer. Clinically, H. pylori infection tends to trigger symptoms such as bad breath, constipation, stomach pain, indigestion, and irritability, all of which improve significantly when the H. pylori infection is controlled. The existence of this germ is related to the Chinese diet and living habits, some people may be infected since childhood, and some people work outside and often eat out, also prone to such infections. Of particular concern is that many children, due to problems with their parents’ feeding habits, can also develop H. pylori infections, showing symptoms such as abdominal pain and diarrhea. Currently, pediatrics can also check for H. pylori infections.