Benign tumors in the intestinal lumen usually do not cause lymph node enlargement. Common causes of lymph node enlargement include infection, tumor, reactive hyperplasia, and other causes. 1. Infection: for example, viral infection, bacterial infection can cause localized lymph node enlargement, and the affected area is often accompanied by pain and swelling. 2. Tumor: for example, lung cancer, stomach cancer, malignant tumor in intestinal cavity can cause local lymph node swelling. 3. Reactive hyperplasia: e.g. systemic lupus erythematosus rheumatic disease, necrotizing hyperplastic lymphadenopathy, etc. 4. Other causes: e.g. nodular disease, lipid deposition disease. People with benign tumors or enlarged lymph nodes in the intestinal lumen need to actively seek medical attention, and patients should not treat themselves, but should be treated according to specifications under the guidance of a physician’s interview to avoid adverse outcomes.