In costochondritis, “costo” means ribs, and “chondritis” means inflammation. While the actual bones of the ribs are inflamed in this condition (it would be called osteomyelitis, and that’s in the bone marrow, and is an infection), the cartilage in the ribcage is. This is usually a short-term condition and usually resolves itself, but for many EDSers, episodes of costochondritis seem to happen much more frequently. It is oddly more frequent in women, with 70% of people with costochondritis being AFAB. Avoiding exercising, applying heat/ice to the affected rib(s), and stretching often help reduce the pain, but surgical removal of the affected cartilage may be considered if those treatments, as well as using anti-inflammatories, do not help.