costochondritis

noun

cos·​to·​chon·​dri·​tis -kän-ˈdrīt-əs 

: inflammation of the cartilage connecting the ribs to the sternum (as that resulting from physical strain, injury, or infection) that is marked by usually bilateral chest pain : inflammation of the costochondral joints

Costochondritis symptoms are almost identical to Tietze syndrome, except costochondritis doesn't cause swelling that you can see or feel. It typically affects ribs lower down your ribcage—usually ribs two through five.

—Cleveland Clinic