Hello, so I've had on and off chest pains on the left side with upper back pain between the shoulder blades. Sometimes the pain would radiate to my left arm and I had to see a cardiologist. The doctor took my blood work, ECG's, and Echocardiogram but all of the results came back normal. So I was convinced that the pain had to do with chest wall etc. However, the chest pains and left arm pain returned after a month and it has been lingering the past few days. My question is, since my ECG and Echocardiogram came back normal, this shouldn't have anything to do with the heart right ? When the left side chest comes, it would come out of nowhere pretty intense with the back pain and last a minute or two. When I workout, I don't feel any pain.