I had stabbing upper back pain on the left side then it resulted into sternum pain? what could it be?

A variety of causes : there can be a lot of medical reasons for your discomfort. It can come from problems in your chest, your heart or even in the abdomen. This is something you need to have evaluated by a physician. The fact is the pain started in the back comes around to the front could suggest certain diagnoses. I think of the as pleurisy or other issues, I think of the heart such as pericarditis, and I I think of the long, such as pleurisy or other issues, I think of the heart such as pericarditis, and I think of the abdomen such as the gallbladder but there could be other reasons besides the