The symptoms of diarrhea and bad breath may be related to gastroenteritis and indigestion. 1. Gastroenteritis: If the patient is infected by microorganisms, it may cause gastroenteritis, with typical symptoms such as diarrhea, abdominal pain, nausea, vomiting and bad breath. Oral medication such as montelukast can be taken to relieve symptoms. If accompanied by Helicobacter pylori infection, bad breath may also occur, and need to be treated with quadruple therapy, such as bismuth + omeprazole + amoxicillin + clarithromycin. 2. Dyspepsia: If the patient does not pay attention to the diet structure, long-term overeating, may lead to gastric dynamics, causing dyspepsia. In addition to diarrhea, bad breath and other manifestations, it may also be accompanied by loss of appetite, abdominal distension and a series of symptoms. It can be treated with oral medication such as stomach-enhancing and eliminating tablets and domperidone tablets as prescribed by the doctor. It is recommended that patients seek timely medical attention to clarify the cause of the disease, and then strictly comply with the doctor’s prescription medication.