Lymph nodes are usually referred to the Department of Surgery, but can also be referred to the Department of Hematology and Oncology. In most cases, the swollen lymph nodes are caused by bacterial infection of the lymph nodes, which usually manifests as painful and swollen lymph nodes, and the surface of the lymph nodes may be red. When the inflammation is severe, it can lead to an increase in body temperature, which means fever. For the treatment of lymph nodes, oral antibiotics are needed, such as cefradine or cefixime. If the lymph node forms an abscess, a surgical incision is required to drain the abscess. If painless lymph node enlargement is suspected to be caused by malignant tumor, you can go to hematology or oncology department for relevant examinations, including lymph node biopsy for pathological examination, or lymph node puncture for pathological examination to clarify the diagnosis.