The causes of hard lumps in chest without pain mainly include the following aspects: 1, benign occupancy of chest or breast, such as local lipoma, sebaceous cysts or hemangioma, fibroma, etc., due to the lack of pain patients are easy to ignore, and should go to the hospital for ultrasonography to determine the cause. 2, malignant tumors of the breast, the patients do not have obvious pain, so it is easy to ignore, and must go to the hospital to carry out Ultrasonography can be a clear diagnosis, because most of the malignant tumors at the initial stage of only 1 hard lump, without any clinical manifestations, pain is the most common reason for patients to ignore the consultation. 3, local trauma reaction stimulation, the local hardness of the performance of varying degrees, caused by hematoma radicalization.