What could it be or what do i do when i am getting a quick pain & pressure feeling in only my left ribs on & off. i can be sitting or up & moving when it happens, & i dont feel it in the right side. never felt anything like this, comes & goes?

Sharp,fleeting rib cage pain, often provoked by a deep breath or other motion, is often caused by a pinched intercostal nerve or muscle which runs between 2 ribs. These usually resolve on their own and are more of a nuisance than anything serious. Lung pathology would usually be accompanied by cough,shortness of breath,etc. See your MD for evaluation. An xray may be advised as part of the evaluati