Thank you for sharing your story. I started getting left sided chest pain a few years before TOS came into the picture. I became concerned one night in particular and went to urgent care for an EKG, etc. All were normal and told I had Costochondritis, an inflammation of the costals where they connect into the sternum.

It would come and go over the next years and then TOS appeared along with constant costochondritis. From what I've seen on forums, this type of chest pain does seem to be a fairly common symptom. Was mine a harbinger of things to come?

I no longer have it and I think it's due to PT and breathing exercises, possible expanding the area and making the joints more mobile. When I did get the jolting pain above the heart, it did seem to be positional, but I don't think it was vascular related for me.