Children with lymph nodes are often referred to as enlarged lymph nodes, need to do ultrasound examination, blood routine, pathological tissue biopsy and so on. 1. Ultrasound: ultrasound examination of children with enlarged lymph nodes can assist in determining the size and shape of the lymph nodes, the nature of the liquid content, and the relationship with the surrounding tissues. 2. blood routine: patients with enlarged lymph nodes, can improve the blood routine examination, such as lymphocytes or heterogeneous lymphocytes increased significantly, need to be alert to infectious mononucleosis, tuberculosis, lymphoma and other diseases may be. 3. Pathologic tissue biopsy: If the child’s lymph node enlargement is obvious and the diagnosis is not clear, lymph node puncture biopsy or lymph node incision biopsy can be carried out, which can clarify the nature of the lymph node. It is recommended that parents should bring their children to the doctor in time when they have enlarged lymph nodes. Combined with the baby’s medical history and other clinical manifestations, the doctor will choose the appropriate method to make a clear diagnosis, and the treatment can be carried out according to the doctor’s instructions.