A bone protruding in front of the chest may be due to the following reasons: 1. It may be caused by a normal bony protrusion, such as a normal bony protrusion of the type of sternal angle and raphe in front of the thorax itself. If the patient is thin, this bony prominence will become very obvious. This situation is normal, not a pathological state. 2, may be caused by chicken chest, if the patient has malnutrition during growth and development, it may produce rickets, which may lead to chicken chest. This kind of thoracic deformity is manifested by the obvious forward protrusion of the sternal area.3. It is caused by old injuries, for example, if the patient has old fractures of the sternum and ribs, there may be localized excessive osteophytes, which may lead to the bony protrusion in front of the chest.4. This kind of situation is due to the occupying disease here, for example, the appearance of bone tumors.