Last two nights, my sleeping positions was ackward as was working on laptop by sleeping position on left side and sometimes totally sleeping on front with chest and abdomen downside. Today afternoon, I start feeling rib cage pain. (Don't think anything inside of chest. It's on middle chest Rib cage. I feel pain when moving hands or coughing. I took flexon Mr. two hours back but still has that pain which can be understood by flexing hands.