The ribs are connected to the sternum (breastbone) by cartilage. This connection is called the "costochondral junction," which means the joining of bone and cartilage. Costochondritis is chest pain and tenderness in this region of the chest. One type of costochondritis caused by swelling of the cartilage is called "Tietze's syndrome." It can occur anywhere in the chest but usually on the left side.
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