@robertov
I will post to you what my R/O at UFHPTI, R/O at Mayo Jacksonville, and PCP at Mayo Jacksonville advised me about this. I also read about this in the information packet given to me at UFHPTI.

This comes directly from my R/Os. When you get radiation to prostate many things are done to lower radiation damage to healthy organs, tissues. However some radiation damage most likely to occur. The colon gets hit and damage does occur.

What happens is after your finish treatments the body starts to make new blood vessels that were damage. These vessels are very fragile. Normal bowel movements, constipation, etc. can damage these vessels. Thus you will see minor spot like bleeding. As the blood vessels mature they become stronger and will eventually not bleed.

This mirrored exactly what happened to me and really thank R/Os giving me a heads up could experience it. I do know when meeting each week with my R/O during treatments would directly asked about any bleeding. Those type questions continued to after treatments ended at 3 months, than 6 months, then yearly as they are now.

Talk to your R/Os about this and the degree of your bleeding. Just wanted to pass on my direct experience with this.