I would say your stomach. Not your intestines but your actual stomach. I took some pills one day without eating and had horrid pain right were you are describing and it was literally min after I took them. A nice glass of milk took care of the problem but that would be my best guess.
cartilage
There are two organs located below the rib cage near the center of the chest. Both the stomach and the spleen are organs located in this general position on the body.
diaphragm
Sternum is located in the center of rib cage. You normally include manubrium sterni as a part of this bone. Sternum is located in the front of your chest.
It can be located any where but better below the breastrib cage because it is safe and secure compared to other places around the body. Think about it , your heart by your stomach???????
There is a kidney and the liver is on the right side.
it is located in the upper abdomen to the right of the stomach and immediately below the diaphragm (the diaphragm is a set a muscles below the rib cage and lungs that help with breathing.)
The respiratory organs of man are called the lungs. The lungs are located in the chest and are protected by the rib cage.
it is located in the upper abdomen to the right of the stomach and immediately below the diaphragm (the diaphragm is a set a muscles below the rib cage and lungs that help with breathing.)
rib cage
In the posterior position the ribs articulate on individual vertebrae of the spine. I the anterior position they converge on the sternum. There is no bone in the centre of cage made by the ribs.
Splenic trauma is physical injury to the spleen, the lymphatic organ located in the upper left side of the abdomen just under the rib cage.
Heart & Lungs ... etc.