How long can a patient live with mediastinal tumor cannot be generalized, but needs to be analyzed according to the nature of the tumor. If a benign mediastinal tumor is surgically removed, it usually does not affect the survival time of patients and is no different from normal people; if a benign mediastinal tumor compresses the lung and heart, patients may experience chest tightness, shortness of breath, angina pectoris, and may lead to arrhythmia and emphysema, etc. If the tumor is not surgically removed, it may affect the survival time of patients. If it is a malignant mediastinal tumor, the five-year survival rate of the patient is about 10% if the treatment is carried out in the early stage of the tumor; if it is a middle or late stage malignant mediastinal tumor, the 1-year survival rate can be less than 1%. In addition, air pollution, smoking and other factors can lead to the emergence of mediastinal tumors, which should be actively prevented to avoid this disease.