There are many reasons that cause the bone under the chest to protrude, and the common reasons that cause the bone under the chest to protrude are as follows: first, it may be caused by the misalignment of the bone, if it is caused by the misalignment of the bone, usually accompanied by the pain and the symptom of activity limitation, it is necessary to go to the hospital as soon as possible to take a picture and check the specific condition, and then choose to treat it through the manipulation of the reset or through the surgical treatment. Secondly, it may be caused by calcium deficiency, because calcium is one of the important elements for bone growth, so when the human body lacks calcium, the symptoms of bone growth deformity may occur. It can be treated by increasing the intake of calcium, common foods with high calcium content, such as bean products, eggs and milk, etc. You can also take calcium supplements and vitamin D, and get more sunshine to promote the absorption of calcium.