@jcmacqueen
Did your R/O advise about rectal bleeding?
My R/O and the information provided to me stated that the radiation can damage your rectum and cause bleeding. I was advised that the small blood vessels can be damaged and when knew vessels form they are very prone to bleeding.

Constipation and hard stools can add to it. The vessels I was told would eventually mature and not be so prone to bleeding. However, was told the bleeding would be more like noticing it on toilet paper, seen in feces, or notice in toilet.

I think you say yours is significant bleeding. I would check with your R/O or whomever did your radiation and let them know about the significant bleeding.

Did you have high dose or low dose? My PCP says the high dose (stronger radiation but less treatments) can lead to more significant side affects for some. When you had your radiation did you have the Space/Oar? This was a gel injected to move your rectum away from prostate to help limit radiation damage to it. If you did not have it down it could have lead to more damage but this is something you should discuss with your R/O.

I did have some minor bleeding several months after radiation stopped. It has gone away now. I had proton radiation with Space/Oar and 30 rounds (not the hight dose regiment) in May/June/July of 2023.