Mediastinal lymphatic metastasis of lung cancer will affect trachea, esophagus, blood vessels and nerves, and mainly have the following manifestations: 1. Compression of trachea: enlarged lymph nodes may also compress trachea, main bronchus or ronchi, causing partial airway obstruction, leading to inspiratory dyspnea, shortness of breath, wheezing, wheezing sounds can be heard, and triple concave sign can be seen. 2. Compression of esophagus: If it compresses the esophagus, it will cause dysphagia. 3. Compression of nerves: enlarged mediastinal lymph nodes will compress the recurrent laryngeal nerve, mostly on the left side of the recurrent laryngeal nerve, and hoarseness will occur. 4. Compression of superior vena cava: it will lead to superior vena cava obstruction syndrome, which manifests as bruising and edema of the head, face and upper body, swelling of the neck and dilatation of jugular vein. Patients who find mediastinal lymph node metastasis of lung cancer are recommended to consult the thoracic surgery department of regular hospitals to make reasonable plans.