High density in the anterior mediastinum is considered to be related to thymic cyst, enlarged thyroid nodule, thymoma and other diseases, which need to be further examined in the hospital to clarify the cause of the disease, and then consult the doctor in time. 1. Thymic cyst: generally due to the thymic cyst infection or lesions, caused by the phenomenon of increased density of the anterior mediastinum of the chest, thymic cysts will appear shortness of breath, cough and other symptoms. 2. Enlarged thyroid nodule: it is usually due to the obstruction of the entrance part of the chest caused by enlarged thyroid nodule, so that the venous return is impaired, causing the phenomenon of high density in the anterior mediastinum, and the enlarged thyroid nodule usually causes symptoms such as shortness of breath, cough and so on. 3. Thymoma: it may be due to thymoma, which leads to the abnormality of thymic epithelial cells, causing the phenomenon of high density of anterior mediastinum, and thymoma usually presents with symptoms such as bone pain. If the phenomenon of high density of anterior mediastinum occurs, one should go to the hospital for consultation in time. In daily life, one should pay attention to rest, proper exercise and reasonable diet.