The protrusion of the bones in the forehead may be caused by being too thin to make the protrusion of the sternum obvious or by costochondritis, chondroma and so on. 1. Too thin: there are some relatively prominent bony structures in the position of sternal handle, sternal body and raphe itself in the anterior chest, if the body is thin, the prominence of these bony structures will be more obvious, at this time there is no symptom, and no need for treatment. 2. Costochondritis: injury of rib cartilage and ligament, viral infection of upper respiratory tract can lead to the occurrence of costochondritis, and the patients can have chest wall pain, swelling, pain aggravated by lifting and pulling heavy objects or coughing hard, etc., and the ribs can be swollen and protruded in the forehead. 3. Chondroma: Chondroma can be caused by traumatic stimulation or congenital factors, such as sternal handle and sternal body, which is a kind of benign tumor. Patients may have no obvious symptoms, but may also have symptoms such as swelling and protruding of the anterior chest. The protruding bones in the forehead can also be caused by other diseases. Patients with symptoms such as soreness, pain, etc. should go to the hospital for examination and treatment in time, so as to avoid delaying the condition and causing serious consequences.