Possible causes of gastric ulcer with bad breath include Mycobacterium pylori infection, functional dyspepsia, and bile reflux gastritis. The causes are different and so are the treatments. 1. Helicobacter pylori infection: Helicobacter pylori infection may lead to gastric ulcers, accompanied by bad breath, generally use quadruple therapy to eradicate Helicobacter pylori, a proton pump inhibitor (such as omeprazole), plus a bismuth (such as bismuth potassium citrate), plus two antibiotics (such as amoxicillin, clarithromycin), two weeks of medication to basically achieve the effect of sterilization, the eradication of halitosis. 2. Functional dyspepsia: cause celiac disease in the stomach for a long time to stay, abnormal fermentation of the gas produced by the return of the odor caused by bad breath, which in the daily diet should pay attention to small meals, to avoid overburdening the stomach, is conducive to the promotion of gastric emptying, but also in the life of the relaxation of the mood, reduce the pressure, the symptoms of severe oral medication, such as domperidone, digestive enzyme tablets, etc.. 3. bile reflux gastritis: bile reflux leads to gastric mucosal damage, and can be accompanied by halitosis symptoms, the treatment can choose to enhance gastrointestinal dynamics of drugs such as domperidone, mosapride, etc., gastric mucosal protective agents such as bismuth potassium citrate, aluminum sulfate. Gastric ulcer with bad breath may also have other causes and treatments, it is recommended to go to the hospital to identify the cause of the disease, give targeted treatment. The above medication should be used under the guidance of a doctor.