Lymph nodes are important immune organs of the body, and lymph node enlargement is a common disease. Lymph nodes are distributed throughout the body, often in groups, and each group of lymph nodes collects lymphatic fluid from the corresponding drainage area, which can cause lymph node enlargement if in a pathophysiological state. Enlarged lymph nodes are very common and can be seen in a variety of diseases, both benign and malignant. If the symptoms of enlarged lymph nodes are mild, single or scattered in several arrangements, soft in texture, no pressure pain, no adhesions, no other symptoms accompanying them, and the number and size remain unchanged, they are not a problem. Viral and bacterial infections, tumors, reactive hyperplasia, abnormal cell proliferation and metabolism can all cause enlarged lymph nodes. Whether the swollen lymph nodes are serious or not should depend on the cause of inducing swollen lymph nodes. If the swollen lymph nodes are guided by acute and chronic inflammation caused by microbial infection, they will return to normal after the inflammation subsides, while if the swollen lymph nodes are caused by lymphoma, various types of acute and chronic leukemia, plasma cell tumors, or metastasis of tumors such as lung cancer, they are more serious. If the enlarged lymph nodes are larger, more numerous and growing rapidly, and the lymph nodes in other parts are enlarged at the same time, and are accompanied by other symptoms such as fever, anemia and emaciation, you should go to the hospital for relevant examination and confirmation in time for targeted treatment.