Middle back pain on your left side can take many diverse forms. It can occur as a sudden sharp stitch or as a throbbing, ...

The pain of chronic pancreatitis, where a pancreas has been so damaged by inflammation it stops working properly, “usually develops in the middle or left side of your tummy and can move along ...

Pericarditis is inflammation of the thin sac that surrounds the heart. It can cause a sharp pain on the left side or middle of your chest. You might also have pain in one or both shoulders.