Hello, my father had one of his kidneys removed 4 months ago. It was not removed laproscopically,but with a large 12 " incision. Which they also had to bend his ribs on that same side. For the first couple of months he was feeling a lot of pain on his left side and back where the kidney was removed,but started to decrease slightly. Recently he has now started feeling pain on the opposite side and back. He also has found his appetite to decrease within the past week. He has been taking hydrocodone the whole 4 months every 8 hours or so. Is it a possibility that the meds are causing his appetite to decrease and the pain on the other side? I am worried that there may be something wrong with the one kidney he has left. Please anyone who has any answers i would appreciate it so much.