Calcification of mediastinal lymph nodes is due to calcium salt deposition caused by infection or tuberculosis, etc., which results in the appearance of high-density bright spots on imaging. Mediastinal lymph node calcification is usually caused by various factors such as calcium salt deposition, mediastinal infection, tuberculosis, etc. It is recommended to go to the hospital in time for CT, biopsy and other examinations to determine. If the patient does not have other uncomfortable symptoms, it usually does not need special treatment, and regular review in the hospital is sufficient. 1. The most common mediastinal lymph node calcification is caused by calcium salt deposition in the process of healing and repairing mediastinal lymph node tuberculosis. 2. Other types of infections may also have calcium salt deposition during the process of repair, leading to calcification of mediastinal lymph nodes. 3. Calcium salts may also be deposited during tumor development, causing calcification of the mediastinal lymph nodes. When patients have mediastinal lymph node calcification, it is recommended to go to the hospital for examination in time, so as to avoid delaying the condition and leading to adverse consequences.