Fx rib yrs ago NOW every time I get cough etc it flares, hurts, hard to deep breathe for wks! Is that a muscle or cartilage? I do have MG & osteoporosis

Possible fibrous -- -union. Or non union of the fracture. Or can be costochrondritis (sp). This is where the bone of the ribs connects to the cartilage of the rib cage that is attached to the sternum. To be sure, you can start with your PCP & get referred if needed. .