There are several possible reasons for the presence of protruding ribs in children and adolescents: 1. The ribs on the lowermost edge of both sides show symptoms of exostosis, where the entire rib cage is protruding in appearance, and the protruding symptoms gradually disappear as the horizontal position of the chest rises, a condition also called rib exostosis, which is a natural phenomenon experienced by most people during their growth and development. This is mainly due to the fact that the ribs generally complete their development around the age of 25, and some of the ribs are cartilage before the age of 25, while some of the ribs have become hard ribs, due to the elasticity and inconsistent shape of the rib protrusion symptoms; 2, if there is a single local swelling and protrusion symptoms on one side of the ribs, there may also be a malformation of cartilage development or local benign bone tumors, this situation requires timely 3. If the rib cage has a bead-like protrusion, it is likely to be caused by vitamin D deficiency, which may lead to rickets.