What's Under Left Breast Bone?

Under and around the left breastbone are the heart, spleen, stomach, pancreas, and large intestine. And that's in addition to the left lung, left breast, and left kidney, which actually sits higher in the body than the right one.

What organ is under my left rib cage?

Your spleen is an organ that sits just below your left rib cage. Many conditions — including infections, liver disease and some cancers — can cause an enlarged spleen.

What is the bone under your breast called?

The sternum is a long, flat bone that's located in the middle of your chest.