A bad stomach may affect many functions of the digestive system, such as the absorption and digestion of food, as well as the endocrine and nervous systems. A bad stomach may result in unformed stools, bloating, increased frequency of stools, or even constipation or blood in stools. Stomach bleeding and upper gastrointestinal bleeding are also a common cause or manifestation of gastric problems. Of course, from the stools, it may also be black stools or stools with blood, so the stomach is not good on the stools there is also a certain impact. In recent years, clinical studies have analyzed that Helicobacter pylori in the stomach can also cause atypical symptoms and signs in the intestinal lumen or abnormalities in the stool. Therefore, if you have abnormal stools and gastric problems, it is recommended to check for H. pylori, and provide comprehensive treatment for both gastric and intestinal problems.