Enlarged lymph nodes in the arm generally suggests pathological changes in the portion of the lymph nodes located on the upper arm area of the body on the pulley, and some of the common pathological changes include the following. 1. Obstruction of lymph node reflux around the arm leads to enlarged lymph nodes on the pulley due to lack of circulation. 2. Infectious diseases of the soft tissues of the arm leading to enlarged lymph nodes or axillary folliculitis, idiopathic lymph node metastasis, and so on. 3. Lymph node metastasis caused by lymphatic tuberculosis, lymphatic tumor, and malignant tumor in the late stage of development. Generally speaking, the arm lymph nodes refer to the lymph nodes located in the upper arm of the right and left arms of the human body, which are located in the inner side of the upper arm, 3-4cm above the medial epicondyle, and in the groove between the biceps and triceps muscles. If the arm lymph nodes appear enlarged, it generally suggests that pathological changes have occurred in the area, and it is recommended to go to the hospital as soon as possible to clarify the condition and then carry out appropriate treatment.