Lymph nodes are present in many places in the body, and the area where lymph nodes are densely distributed is the neck, so enlargement of lymph nodes is often palpable in the neck. In most cases, the lymph nodes are benign manifestations. Benign lymph nodes often have obvious pain, because inflammation will cause the lymph nodes to swell at the same time. In addition, patients can also undergo local ultrasonography, which can more directly observe the severity of local lymph node enlargement, the specific morphology of the lymph nodes, and the lymph node blood flow, all of which are the most important criteria for determining whether a lymph node is benign or not. When there are abnormal structures in the lymph nodes, it is necessary to pay high attention, because this is often a manifestation of bad lymph nodes.