My moTher who is 80 has brain cancer she is on her 9 th radiation treatment, and she is on steroids, I'm noticing that her face is start to swell is this from the steroids,radiation or the cancer??
I don't know for sure but when my nephew was being treated for glioblastoma, at one point he was on high dose radiation only which caused very significant swelling in his face. I've also heard of severe swelling due to steroids. A couple of friends with MS have experienced this. So, sorry, I'm not too sure how you could tell other than systematically stopping the steroids and radiation.