There are several organs on the right side of the body, just under the breast, including the gallbladder, kidney, liver and the tip of the pancreas. Since organs are so varied in this area, it can be difficult ascertaining where any unexplained pain is originating from.
Intense pain under the right breast can indicate gallbladder inflammation or the presence of a gallstone. However, there are numerous conditions that can cause pain in this area, including injury to the rib bone and cartilage. Therefore, it's very important to have any new pain in this area properly evaluated by a medical professional.