Hi, I have Psoriatic Arthritis and Fibro, I was told I have costochondritis in Jan 2010. I have never experienced pain like it my life. I suffered 10 months of hell in my ribs, breast bone and sternum.... not sure of the cause.... it effects every area on my left side. I had anti inflammatories and even steroid injections, they work for about 6 months then this winter it has flared on my right side, does anyone else get it there !? PS. I had heart tests ecgs and heart traces all came back fine !