I would say it started 6 weeks afterward and kept progressing for another six weeks. It became much worse. Unfortunately it took many weeks before I was able to schedule physical therapy. I had MRI actually and not CT. I also ended up with reflux. I think radiation oncologists should discuss all of the effects of radiation. The skin issues are real but not the only effects. Everyone seems to focus on the skin and not the other organs that might be affected. Although I tolerate the pain and aches, it does constantly remind me that I have breast cancer. I continue to be mobile and am grateful that I am still alive.