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You are probably getting some irritation already from the radiation though just a week of it seems a bit premature for such a thing. You want a full bladder for the treatment to keep the bladder out of harm's way. An empty bladder sags into the target area. (and an empty colon is recommended so it is not intruding into the radiation area) I also think a full bladder makes a better "picture" on their scanner so they can make fine adjustments to the beam aiming to avoid the bladder. (Fluid in the bladder shows up on the scan more clearly I think than just tissue.) Basically, time your water drinking so you have a comfortably full bladder by the time your appointment is. I was told it takes about twenty minutes for excess water to reach the bladder so time your last drink of water for about that time span. Definitely ask about the increased urge you are experiencing already. Sounds a little early for that but it is one of the side effects of the treatment. best wishes for successful treatment. (You didn't say if this is primary cancer treatment or salvage radiation treatment as there is a difference. Jon.
The objective is to have a full bladder during the radiation treatment and it should be the same fullness as when they are doing the pre-treatment scan. I would just have my morning coffee about 45 minutes before treatment, drink a bit of water on the way and I was guaranteed to have a full bladder but not painfully full. Ask your doctor if you can reduce your water drinking but you will make sure you have a full bladder for the treatment and he will probably say that that is fine.
The foods were not actually banned (at least where I got radiated) but are listed as foods to eliminate if you are having problems. Coffee may even protect against some radiation damage as suggested in some papers but that really hasn't been proven.