A small colonoscopy can check for diseases such as small bowel inflammation, small bowel polyps, and Crohn’s disease. Small colonoscopy mainly checks whether diseases occur in the small intestine. There are two main types of small colonoscopy, one is small colonoscopy done through mouth and the other is small colonoscopy done through anus. 1. Small bowel inflammation: it is caused by bacteria, virus, diet and other factors, mainly divided into acute and chronic two kinds, acute small bowel inflammation with nausea, abdominal pain, and chronic small bowel inflammation patients will have recurrent abdominal pain, diarrhea symptoms. 2. Small intestinal polyps: small intestinal polyps are benign tumors, small in size and grow with tips. After regular treatment, the cure rate is high.3. Crohn’s disease: it is a chronic digestive disease, mainly caused by genetic factors, unhealthy eating habits.