Colonoscopy does not examine the small intestine. As the name suggests, colonoscopy is used to examine the colon, but it can also examine the rectum at the same time, which means that the entire large intestine is examined. If you want to know the condition of the small intestine, you need to go through a small colonoscopy. However, the operation of small colonoscopy is complicated, so most hospitals do not carry out small colonoscopy. However, it is possible to examine the small intestine through capsule endoscopy, the operation method is to prepare the intestine first, and then swallow a capsule-like endoscope, which can start from the entrance of the esophagus all the way to see the anus, that is, the whole digestive tract all the way through. However, capsule endoscopy mainly collects pictures through the computer, so it is very likely that there will be dead space and lead to leakage and misdiagnosis. Also, capsule endoscopy is more expensive. If you want to check your intestines, it is recommended that you need to visit a hospital first and choose gastrointestinal endoscopy as appropriate under the guidance of a specialist.