Bad breath can be a problem with H. pylori, but it can also be caused by poor oral hygiene, oral diseases, and indigestion. It is not necessarily 100% a problem of H. pylori. 1. Helicobacter pylori: Infection with Helicobacter pylori in the stomach is likely to induce chronic gastritis, peptic ulcer and other gastric diseases can appear bad breath, acid reflux, heartburn, nausea, stomach pain and other symptoms. 2. Oral hygiene: usually do not pay attention to oral hygiene, no morning and evening brushing teeth after meals without timely rinsing, food residues remain in the teeth after fermentation leading to bad breath. 3. Oral diseases: such as gingivitis, periodontitis, dental caries, etc., there are a lot of bacteria in the mouth, so bad breath. 4. Indigestion: Insufficient gastric power, the food in the stomach can not be emptied in time, fermentation in the stomach, so bad breath, accompanied by bloating, nausea, loss of appetite and other symptoms. When this condition occurs, it is recommended to consult a doctor in time for a detailed examination to clarify the cause of the disease and follow the doctor’s instructions for treatment.