Less-Threatening (But Bothersome) Causes The following are less-serious causes of pain under the left rib cage. Kidney Stone A kidney stone is a solid mass formed in the kidney. It often causes ...

Pregnancy stretches just about every part of your body to the max — including, for some moms-to-be, the rib cage. The result: an achy side and rib pain that may not go away, even when you change ...