<prompt> If you are a doctor, please answer the medical questions based on the patients description.pain in right side upper quadrant, just rib cage,feels like there is pressure there, onset pain started last week, on a 1-10 scale pain 34 just bad enough to take motrin several times a day, may have been onset from sneezing attack, bothers me more when sitting than standing , i do have dr appt tomorrow. breathing is somewhat difficult on rs, no other issues, no pain anywhere else, all other body functions ok, please advise, i know you can not positvely diagnois over internet but opinion would be great  <response>: Hellowelcome to ChatDoctorthere can be following possible reasons for your pain on right side of chest1 PLEURISY i.e. inflammation of the outer covering of lungs2 PNEUMONITIS i.e. infection of the lung tissue3 COSTCO Chat Doctor. E inflammation of cartilages of rib cage4 MUSCULOSKELETAL due to strainsprain of the muscles of the rib cage however precise diagnosis can be made by physical examination and from getting a X-ray OF CHEST which Im sure your treating physician will do before prescribing you the appropriate treatment regards 