Look up costochondroititis. It''s an inflammation of the cartilage that connects your sternum and ribs. It can mimic the paiin of a heart attack or lung problems, but if you press on your sternum lightly and experience pain, that's it. You can look it up on the national library of medicine web site .Org.

I had this and went to the er thinking I was having a heart attack it hurt so bad. Later my rheumy told me it is a condition of psoratic arthritis, which is similar to rheumatoid.

Good luck

mia