Thanks for your question on Health Care Magic. I can understand your fiance s situation and problem. By his history and description, possibility of left sided renal colic (stone) is more. But better to first rule out cardiac cause because left sided sharp chest pain is mostly due to heart diseases. So get done ecg. If ecg is normal, than no need to worry for heart diseases. Renal stone causes similar kind of sharp, stabbing pain in front as well as back. So get done ultrasound examination of abdomen to rule out left renal stone. If this is also normal than he is mostly having musculoskeletal pain. So painkiller and muscle relaxant drugs are beneficial. Apply warm water pad on affected site. Avoid movements causing pain. Don t worry, he will be alright. But first rule out cardiac diseases and renal colic. Hope I have solved your query. Wishing good health to your fiance. Thanks.