I wanted to share my recent discovery since this is something I've never heard of before. I've had fibromyalgia for about 8 years, and the first sign of unusual pain (aside from neck & back pain) was mainly in my ribs. It feels like they're restricted, like it hurts to breathe deeply, and somewhat like I bruised the bones somehow. This has been going on for 8 years. I was diagnosed with fibro last year, which helped me find ways to self treat much quicker. Costochondritis is an inflammation of the cartilage in the ribs, causing pain similar to what I described. Luckily it's treatable, although I have yet to visit a doctor and I'm aware that ibuprofen and other over the counter anti-inflammatory drugs don't always help. Cymbalta has helped the burning pain that comes with the rib pain, but if I get off schedule, I notice the burning returning. Costo is frequently linked to fibromyalgia. Wish I had looked into this much sooner!