Diarrhea small intestine a pain with gas may be acute gastroenteritis, gastric ulcer, duodenal ulcer disease, may also be irritable bowel syndrome and other diseases lead to. 1. Acute gastroenteritis: acute gastroenteritis is due to bacterial, viral, parasitic and other pathogenic infections, the patient will have diarrhea, abdominal pain, nausea and other symptoms, so the patient will have diarrhea small bowel a pain in the performance of gas. 2. Small bowel inflammation: small bowel inflammation is due to infection, allergies, medications and other factors, the patient’s main symptoms are diarrhea, abdominal pain, abdominal fullness and so on. Therefore, the patient will appear diarrhea small intestine a pain in the phenomenon of gas. 3. duodenal ulcer: duodenal ulcer is caused by the mucosal defense ability to reduce, patients will have abdominal pain, diarrhea, belching and other manifestations. So patients with duodenal ulcer, there will be diarrhea small intestine a pain in the performance of gas. 4. Other: irritable bowel syndrome, ulcerative colitis, small bowel malabsorption syndrome and other diseases can also lead to diarrhea and small bowel pain with gas. Patients with diarrhea small bowel a pain in the gas symptoms, it is recommended that patients seek medical attention in a timely manner, in accordance with medical advice.