Small intestinal tumors can be divided into the following two categories: 1. malignant tumors: small intestinal cancer originates from epithelial cells, and the incidence of malignant tumors such as lymphoma and carcinoid tumors is low; 2. benign tumors: for example, small intestinal lipomas and small intestinal smooth muscle tumors are benign. When lipomas and smooth muscle tumors are larger, the cells will become malignant and develop into liposarcomas or smooth muscle sarcomas, which are malignant. There are also mesenchymal tumors in the small intestine, which are also malignant if they are larger. Small intestinal tumors have a certain incidence and need to be examined and treated promptly.