Mesenteric lymph node enlargement in adults caused by infection is usually not very serious; mesenteric lymph node enlargement in adults caused by malignant tumor is more serious. 1. Inflammation: When the body’s immunity is low, pathogenic microorganisms such as bacteria and viruses invade the organism, which can induce local inflammatory reactions and lead to reactive hyperplasia of mesenteric lymph nodes. In this case, cooperate with the doctor to use antibiotic drugs, such as amoxicillin, cefuroxime, etc., can control the local inflammatory reaction, and most patients can be cured. If because of enteritis, 2. Tumor: mesenteric lymph node enlargement in adults caused by lymph node metastasis of malignant tumors is more serious. Tumor tissue is in the state of highly reproducing and spreading. It is easy to cause local compression, organ failure and other conditions, endangering the patient’s life and health. It is recommended that patients go to the hospital as soon as possible and receive treatment under the guidance of professional doctors so as not to delay their condition.