I was Dx'd with Costo back in January and after having many tests done I guess I believe the diagnosis. I had a CT Scan, XRAY, Abdominal U/S, and lots of blood tests.
I guess the reason I have a hard time believing it is costo is because I get really bad pain on the upper left side of my abdomen (stomach area). It seems a lot of people that have this complain of the pain being closer to the sternum and mine isn't.
Mine hurts the most when I am sitting at my desk at work or driving and the waist of my pants or skirt press into the area. I do get pain sometimes right under the breast as well.
But the worst one is the lower rib, upper abdomen- it feels like something is there pulling- like something is stuck behind the lowest rib or in my stomach.
Re: Costochondritis and upper abdomen/stomach pain?
Another suggestion is visiting a chiropractor. I have had costochondritis (sp??), and what I remember of it (it has now abated), is that when I pressed on my sternum I had extreme pain. But, another thing that I experience which is not FMS related, is my ribs sometimes twist a bit. When I visit the chiro, he patiently manipulates the ribs back a bit and I am fine. When you stated you have pain under the breast, I thought maybe this is what you are experiencing as that is what happens to me. Just a thought.