<s>[INST] I have a lump over my left rib cage and it hurts to the touch. It hurts when i stretch my arms over mu head or when i try to reach for something or put my blouse on. Also, recently it appears that my vein pops out directly over the lump. The lump has been there for almost 3 weeks. The protruding vein for 2 weeks. [/INST] Hello and welcome to HCM,A lump over the chest region (left rib cage) could be a soft tissue swelling or a bony swelling.Pain in the lump on movement suggests that the lump is associated with the musculoskeletal system.I would suggest you to get a x-ray chest to know the site and origin of the lump.After knowing the site and origin, the nature of the lesion needs to be known- whether inflammatory or neoplastic.To know the nature of the lump, an aspiration cytology of he lesion needs to be done.In aspiration cytology, cells are aspirated, stained and examined.Depending on the nature of the lesion, treatment can be planned.Consult your primary healthcare provider for further work up.Thanks and take careDr Shailja P Wahal </s>