My 15 yr old sun has been having pain under the ribs generally on his right. No other symptoms currently. I don't know it this could be related, but in July he experienced lower back pain and blood in urine which lasted several weeks. No antibiotics were administered as a bacterial culture came back negative. He has has xray and sonograms of chest and abdominals. He also had an upper GI which only showed reflux which hs is on meds for, but no relief from the pain under the ribs. Any suggestions as to where to look next or what other tests should be performed.