I have been having pains in my side under my ribs for nearly 2 weeks now. I thought it might've been gas, but it was not relieved with Gas-X, Tums, or even an enema. I went to the ER because i was in so much pain, They relieved the pain with no explanation as to what the problem could be except for Left Flank pain. There was no trauma to the site whatsoever so I'm unsure as to what this could be. I've had several opinions as to what this could be such as Pleurisy etc., but there's no pain when breathing. By the way ER did a CAT scan with everything clear. Can U offer an explanation?