I felt a pop in my chest yesterday and since then its been hurting off and on when i move a certain way and on lifting.what is it & his do i treat it?

Treat with ibuprofen: The area where the ribs meet the breast bone (sternum) is a joint and, like any joint, allows for movement where bones meet and are held together by soft tissue.Fluid in these joint spaces can form tiny bubbles of nitrogen that collapse and "pop" when stretching the joint causes the pressure in the joint to drop-like cracking your knuckles.These forces can irritate the lining of joint, thus pain.