Hi there. I have a recurring sharp pain on my Left abdomen, directly below the rib cage. I also feel sharp pain at the same time in my back, directly behind it. It is always very sudden and always doubles me over in pain. It is on the L side directly below the rib cage, and radiates into my back. I have been to the ER with this, they did an X-ray and found nothing. I've been experiencing this intermittently for a few years. I lay down when it happens, and it gradually goes away, but I usually feel the same sharp pain a couple more times before it goes away completely. i have no idea what is causing it.