Pain on left upper abdomen. hurts,when i breathe in and when i do heavy lifting ?

Costochondritis: Sounds like costochondritis, an inflammation of the tissue in the rib cage in your left lower chest. Usually follows mild trauma , frequent cough, lifting or strenous exercise. Icing the site and OTC meds may help. But if not improved after 1-2 days, please schedule a doctors appointment or a video consult through Healthtap. Best wishes.