If the ultrasound or CT suggests that the mesenteric lymph nodes are enlarged, it is not recommended to apply the navel patch, which can not cure the disease. The most common cause of enlarged mesenteric lymph nodes is bacterial or viral infection. If the patient is a child and has cough and sputum, it is often due to respiratory tract infection, and he needs to see a pediatrician for anti-inflammatory or anti-viral treatment. If the patient has abdominal pain and abnormal blood counts, it is often due to intra-abdominal infections, such as acute appendicitis, acute cholecystitis, etc., and needs to see the general surgery department for anti-inflammatory or surgical treatment. If there is no obvious cause of mesenteric lymph node enlargement, it is necessary to be alert to whether the autoimmune system diseases, or hematologic diseases, or even lymph node metastasis of malignant tumors. Problems need to further improve the examination, do not self-treatment, to prevent delays in the condition.