Lymph node shadow is usually described under ultrasound or CT, which usually represents enlarged lymph nodes. Lymph nodes are normal tissues of the body, and their main function is to filter lymph, remove bacteria and foreign bodies, produce lymphocytes and antibodies, etc. Usually lymph nodes cannot be touched or seen, so if lymph node shadow is found, it means that lymph nodes are enlarged. There are two causes of swollen lymph nodes: 1) inflammation of sexual infection around the lymph nodes, from which swollen lymph nodes generally originate; 2) malignant tumors in the organs or organs near the lymph nodes. According to different causes, swollen lymph nodes should be treated with different methods. If the inflammation of infection occurs, antibacterial, antiviral and elimination of inflammation are needed, and if a tumor appears, anti-tumor treatment is needed. In order to find out the specific cause of swollen lymph nodes, you should go to the hospital for examination and diagnosis and then treatment, so as not to delay the disease and cause adverse consequences.