Small bowel tumors are theoretically seen in gastrointestinal surgery, but some hospitals may need to see them in general surgery. Most small intestine tumors are malignant tumors, so they need to be treated. Small intestine malignant tumors are easy to metastasize and metastasize relatively early, so they must be treated and operated as early as possible, while small intestine tumor surgery is relatively simple compared with most intra-abdominal surgeries, because the small intestine is very long and will not fail to connect after resection. Small intestine malignant tumors are more frequent and metastasis is relatively early, so bleeding and obstruction can occur very early, because the small intestine is thin, after the tumor appears, it can block the intestinal cavity, so the patient often shows abdominal pain, diarrhea and even blood in stool. Therefore, small intestine tumor itself is easy to detect and can be judged by CT examination. Another kind of examination is small intestine microscopy, which has been carried out in many hospitals. Small intestine microscopy can also visualize the tumor, and the pathological results can be taken to clarify whether it is benign or malignant.