There are many reasons for bad breath in gastric disease, such as Helicobacter pylori infection, dyspepsia, etc. The treatment needs to be directed at the above causes, such as anti-Helicobacter pylori and digestive aids. 1. Helicobacter pylori infection: it can lead to gastritis, gastric ulcer and other gastric diseases, in addition, due to the Helicobacter pylori bacteria can decompose the urea in the stomach to produce amines, the formation of irritating odor. Treatment requires acid suppression such as omeprazole, anti-Helicobacter pylori treatment such as amoxicillin and metronidazole. 2. indigestion: can also lead to bad breath, a variety of causes of gastric dysfunction, so that the gastrointestinal tract appears to slow down peristalsis, slow gastric emptying, gastric contents in the stomach stays for too long, resulting in the smell of corruption, causing bad breath. Symptomatic administration of digestive and gastric power drugs, such as gastric suppression tablets, domperidone and other drugs is needed, and surgery is needed for serious cases. In conclusion, there are many possible causes of bad breath in gastric disease, and you should seek medical advice in time and take medication under the guidance of your doctor.