Whether a lymph node is malignant or not is not directly related to the size of the lymph node, but can only be determined by observing the texture of the lymph node and its relationship with the surrounding tissues and by pathological tests. Usually, some of the lymph nodes are larger in size, which may be caused by inflammation, and some of the lymph nodes are smaller in size, which may also be malignant tumor disease. Therefore, the size of lymph nodes is not related to benign or malignant, but the differentiation degree of lymph nodes, heterogeneity and clear boundary with surrounding tissues are the basis for determining whether the lymph nodes are malignant or not. The degree of differentiation, heterogeneity and clarity of the lymph node boundaries with the surrounding tissues are the basis for determining whether a lymph node is malignant. In general, most lymph node enlargement is benign, so patients do not need to worry excessively. When the lymph nodes increase rapidly, especially when the lymph nodes exceed 3 cm, it is necessary to pay attention to the general surgery in time.