There is a hard lump in the middle of chest, which may be physiological sternal angle, or fibroma, sebaceous cyst, sternal tumor. 1. Physiological sternal angle: normal in the sternal handle and sternal body connection, forward slightly protruding into the angle, by the cartilage connection to form the stalk thoracic joint, both sides were with the 2nd rib cartilage to form the thoracic rib joint. Hard lumps can be felt in the middle of chest. 2. Fibroma: the hard lump in the middle of chest may also be fibroma, which is solid, hard and tough, and can be moved by pressing, without pressure pain, and can grow slowly. 3. Sebaceous cysts: caused by the blockage of sebaceous glands in the middle of chest, black enlarged pores can be seen on the surface of the swelling, which is easy to be infected and ruptured, and white acne-like material can be seen flowing out after rupture, accompanied by foul smell. 4. Sternal tumor: it is rare, if it is a sternal tumor, you can feel the hard lump in the middle of chest. A hard lump in the middle of chest may also be caused by other reasons, you should go to the hospital in time, under the guidance of the doctor for treatment.