A hard lump in the middle of the rib cage in the chest is a relatively common symptom in clinical practice, and the reasons for this condition include the following. In one case, it may be a physiological anatomical structure, such as the sternal process of the sternum, which is a sign of a bony protrusion, in which case a small hard lump will appear at the tip of the sternum, which is a normal physiological structure. There are many people who may unintentionally feel this hard lump and mistake it for a long swelling. In fact, this is a normal anatomical structure and physiological phenomenon, there is no need to worry excessively and no special treatment is needed. In another case, there may be a subcutaneous cyst in the middle of the rib cage of the chest, or a hard mass formed by a fibroid or lipoma. In this case, it is best to do an ultrasound to find out exactly how the hard mass is produced and then decide on the subsequent treatment plan.