The patient may have stomach pain, vomiting and diarrhea due to the following conditions: 1. acute diarrhea, after the patient has been infected with viruses, such as rotavirus, salmonella, it is easy to cause intestinal infection, resulting in diarrhea, abdominal pain, and even stomach pain in severe cases. 2. food poisoning, such as the consumption of undercooked lentils, puffer fish, easily cause the gastrointestinal function is impaired, resulting in stomach pain and discomfort. 3. 3, chronic diarrhea, when the intestinal mucosa lesions, small intestine bacteria overgrowth, intestinal peristaltic function is weakened, will also cause patients to appear stomach pain discomfort, which leads to endocrine diseases and intestinal tumors, leading to diarrhea and vomiting and other conditions. 4, small intestine malabsorption, the presence of small intestine malabsorption, will also lead to patients with stomach pain discomfort.