Mild lymph node enlargement is generally a diagnostic description for imaging and is often caused by bacterial, viral, and tumor diseases. Lymph nodes are one of the body’s immune organs. When bacterial or viral infections or tumors occur in the lymphatic drainage area, the lymph nodes will reactively proliferate in order to play an immune role, and appear enlarged in appearance. However, the severity of the disease cannot be determined by the degree of enlargement, and it should be combined with other examinations to make a comprehensive judgment. Lymph node enlargement caused by bacteria and viruses usually manifests as swelling and pain in the lymph nodes. Tumor-induced lymph node enlargement usually shows progressive enlargement, hard texture and no pressure pain. If the relevant examination suggests that the lymph nodes are mildly enlarged, it is recommended to consult a doctor in a timely manner to find out the cause of the disease under the guidance of the doctor and target treatment.