Gastric indigestion and bad breath, consider the possibility of Helicobacter pylori infection, there will be dyspepsia or bad taste in the mouth and other manifestations, you can consider perfecting the carbon 13 breath test or carbon 14 breath test, in order to clarify whether there is Helicobacter pylori infection. If there is H. pylori infection, it is recommended to carry out quadruple bactericidal treatment to eradicate H. pylori. If there is no H. pylori infection, it is considered that the gastrointestinal tract power is poor or the lack of digestive enzymes, causing bad taste in the mouth or not easy to digest, you can apply appropriate drugs to promote the gastrointestinal tract power, and appropriate supplementation of digestive enzymes to alleviate the symptoms, and you should eat light food, reduce greasy, spicy and stimulating food.