Constant dull pain left chest just left of breast radiarig to shulder then back with increased activity cardiac problem already ruled out?

See your doctor: It could be one of many things. Inflammation of the rib cage, degeneration of the spine (neck or midback). It could also be something more serious like a tumor. To sort it all out, see your primary doctor. Consultation with a specialist may be needed, depending on the total health picture.

Many possibilities: It is good you had the heart as a cause ruled out, which is potentially life threatening. Another potentially life threatening condition that can cause chest pain is a pulmonary embolus. A pinched nerve in the thoracic spine from a bony spur or a disc herniation is probably a more common and less dangerous cause. An MRI can be done to evaluate you for that. Thank you for the question.