Mediastinal lymph node enlargement is a very dangerous thing, once found, it is necessary to go to the nearest hospital for further diagnosis to find out the cause of the enlarged lymph nodes, rather than blindly taking medication. Mediastinal lymph node enlargement may be caused by local lung infection or other factors, especially if the presence of malignant tumor is considered, it is important to seek medical attention as soon as possible. If fever, weight loss, malaise, night sweats and other generalized symptoms occur without obvious reasons, the cause must be identified as soon as possible. In case of a combination of general symptoms and malignancy, it is necessary to consult a doctor as soon as possible, and even lymph node aspiration or lymph node biopsy is needed to clarify the cause.