Hi! 🙂 I had a right side colon resection on 8/11 and I did have back pain which I chalk up to all the pressure having to lay on my back or sit in chair. I’m normally a side sleeper. It did start getting better for the most part. I never had pain under my ribs per say but I do have a sharp pain and feeling of something lodged on my left below the rib cage. Not sure what it is. I did have an incisional seroma which was drained and hoping its not a repooling in a different area or worse a hernia. I would mention it to your surgeon.