Pain in left side, below my ribcage. hurts when i stretch a a little, but mostly at the end of deep breaths, especially when i bend over my left side?

It depends: There are many possible causes. An irritation of a nerve in the thoracic pain can cause pain to radiate around one side of the trunk. A perscapular problem sich as bursitis, as well as a lung and kidney problem, can all cause similar symptoms. A detailed exam and appropriate studies can usually tell the cause. Consider being checked. Thank you for the question.