When the lymph nodes are enlarged by 2-3cm, the cause of the enlarged lymph nodes should be clarified first, and the treatment should be selected according to the cause of the enlarged lymph nodes. Common causes include infection, lymph node tuberculosis, tumor and so on. 1. Infection: acute and chronic infections in various parts of the body are often caused by bacteria or viruses, etc. Inflammation can cause reactive enlargement of lymph nodes, and enlarged lymph nodes are often accompanied by pain, clear boundaries, and good mobility, which require anti-infection or anti-virus treatment, and lymph nodes can be reduced in size after inflammation is eliminated. 2. Lymph node tuberculosis: often caused by prolonged tuberculosis, clinical manifestations of low fever, fatigue, night sweats, emaciation and other systemic symptoms, lymph node palpation of the hard texture, and adhesion with the surrounding, the need for isoniazid, rifampicin and other drugs such as anti-tuberculosis treatment. 3. Tumor: metastasis of malignant tumors all over the body involving lymph nodes can lead to enlarged lymph nodes, which are often painful to press and have unclear boundaries with the surrounding tissues, so it is necessary to clarify the benign and malignant nature through lymph node puncture biopsy, etc. and treat the primary tumor. When the lymph nodes are enlarged, it is necessary to consult the hospital in time to clarify the cause of the disease and then treat the cause of the disease. Drugs should be applied under the guidance of doctors.