Stomach disease with severe bad breath, consider the H. pylori infection related, it is recommended that it is best to go to the hospital for examination, if it is determined that H. pylori infection, you can take lactobacillus, clarithromycin, amoxicillin and other drugs for treatment. After taking the drugs for a period of time, stop taking them for 4 weeks and go to the hospital for a review. Taking multi-enzyme tablets and domperidone to promote gastrointestinal motility can also relieve symptoms. H. pylori is contagious, generally parasitic in the stomach as well as the duodenal mucosa and the oral cavity, and can decompose the urea in the mouth to produce an unpleasant ammonia odor and bad breath. It is recommended to pay attention to a reasonable diet, mainly a light diet, do not eat spicy and stimulating food, quit smoking, quit drinking, and keep your mouth clean and hygienic.