Enlarged lymph nodes are usually not contagious, but they need to be treated promptly for the cause of the condition to prevent serious lesions. Lymph nodes are one of the most important immune organs in the human body. Lymph nodes usually have a diameter of 0.2 to 0.5 cm, and enlarged lymph nodes refer to the increase in diameter or volume of lymph nodes in different parts of the body. Lymph node enlargement itself is not contagious, the common cause of lymph node enlargement may be acute and chronic inflammation such as acute suppurative tonsillitis, etc., or it may be caused by malignant tumors such as gastric cancer metastasized to the lymphatic and other diseases. When the clinical manifestation of lymph node swelling occurs, it is recommended to go to the hospital for examination in time to clarify the cause of lymph node swelling, because it is not contagious, usually do not need isolation treatment, treatment for the cause of the disease, can alleviate the symptoms of lymph node swelling.