Understanding Sternoclavicular Joint Swelling A prominent sternoclavicular joint does not necessarily indicate a tumor. There are various potential causes for the swelling, with tumors being just one of many possibilities. Here is a detailed analysis of the potential reasons for a swollen sternoclavicular joint: Physiological Variations There are differences in the physiological structures among individuals, and some people may have a naturally more prominent sternoclavicular joint, which does not necessarily indicate the presence of a disease. Arthritis Sternoclavicular arthritis is one of the common causes of a swollen sternoclavicular joint. This condition often comes with joint pain and stiffness, which... Learn more