Why am i hurting under left breast into rib cage?

I am not sure: It could be inflammation of the ribs and cartilage known as costochondritis, which can be painful. However without a good exam, it is tough to tell you exactly what is going on in the area. See a dr. for a more definitive answer. Best wishes.

Seriously?: Is it sharp or achy? How long does it last? Anything make it better? Any fevers? Does food affect the pain? Have you had any surgery ? How long has it been there? Have you tried any medications? Did they work? Did you injure yourself? Pulled muscle etc? Has anyone done any studies? Need a bit more info? Possible causes: gallbladder? Pneumonia? Ge issues? Muscle strain? Kidney?