In a normal person, a long bone in the middle of the thorax is called the sternum. The sternum, from top to bottom, is divided into three parts: the sternal handle, the sternal body and the raphe. The upper part of both the sternal styloid and sternal body are commonly known as the bones above the chest. Normal sternal handle and sternal body in the middle of the connecting part of the forward protruding called sternal angle, is a normal anatomical structure, normal forward protrusion, such as only normal sternal angle forward protruding, there is no clinical discomfort symptoms, then can not be disposed of any. But when some diseases cause it to protrude forward, and the protrusion is more obvious, and accompanied by clinical discomfort symptoms, such as vitamin D deficiency rickets in newborns, which will appear funnel chest or chicken chest and other symptoms, tumor or fracture of the sternum and so on, which can lead to protruding forward, then you need to go to the thoracic surgery department of the hospital as soon as possible to be diagnosed, and then give the symptomatic treatment according to the different diseases and different conditions. The treatment will be based on different diseases and conditions.