There are many causes of swollen lymph nodes, and the treatment measures for different causes vary. Common causes of swollen lymph nodes include various infections, such as bacterial infections, such as lymphadenitis caused by Mycobacterium bovis, viral infections, such as infectious mononucleosis caused by EBV infection, brucellosis caused by some brucellosis infections, and some parasites can also cause swollen lymph nodes. There are also non-infectious diseases that can cause enlargement of lymph nodes, such as malignant tumors with lymph node metastases and hematologic diseases such as lymphoma that can also cause enlargement of lymph nodes. Other diseases of the immune system, such as systemic lupus erythematosus, can also cause enlargement of lymph nodes. In short, the treatment required for swollen lymph nodes differs from one cause to another, sometimes requiring antibacterial drugs, tumor removal or radiotherapy or chemotherapy.