Stomach pain and diarrhea are mainly considered gastroenteritis, irritable bowel syndrome, digestive tract tumors and other conditions. 1. Gastroenteritis: mostly related to patients’ unclean eating or consuming poorly digested food, at this time patients’ gastrointestinal mucosal edema, manifested as stomach pain, diarrhea, nausea, vomiting and other discomforts. 2. Irritable bowel syndrome: it is mostly related to patients’ mental stress and emotional fluctuation, and the patients present obvious symptoms such as stomach pain, diarrhea, abdominal pain, nausea and other discomforts. 3. Tumor of digestive tract: when patients have digestive tract tumor such as stomach cancer, stomach pain will also occur due to tumor rupture, and intestinal tumor will also cause diarrhea and other symptoms. There may be other reasons for stomach pain and diarrhea, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.