I have sharp pain (not constant~comes and goes) in the middle area of my left shoulder blade. Have had herniation repair at C5-C6 about 4 years ago, which still can present occasional discomfort at neck, or back of shoulder blade region, or upper left arm ache. But this fairly recent (months) nagging, panging pain through the center of whole left shoulder blade area feels different and I am concerned about referred pain from some organic problem. (Heard on a TV ad about a woman with pain between her shoulder blades who had advanced pancreatic cancer~scares me to compare my shoulder blade pain! How should I research this? Shoulder MRI? What do I do? Recent extensive bloodwork with primary care physician (which we check occasionally) had NO flags other than a bit high A1C count. I get frightened because my sister passed away 2 yrs ago with lung/liver cancer (non-smoker).