Poor gastric function with bad breath may be related to Helicobacter pylori, but other causes cannot be ruled out. 1. Helicobacter pylori: Helicobacter pylori is an important cause of poor gastric function with bad breath, the bacterium can survive under strong acidic conditions, and it can colonize and multiply rapidly in the gastrointestinal environment. In the long run, it will cause damage to the gastric mucous membrane of the body, which will lead to bad breath and stomach discomfort. 2. Other reasons: bad stomach function with bad breath may also be due to oral diseases, indigestion, intestinal flora imbalance and other reasons. Such causes will, to a certain extent, lead to gastrointestinal dysfunction, poor digestion and absorption of food, bloating, bad breath, farting, burping and so on. It is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy.