I started peeing blood after radiology treatments. My oncologist sent me back to my urologist. They performed a test that I can't remember the name of, but basically, they looked inside my bladder and they determined that the bleeding was due to scar tissue in my bladder from the radiation treatments. They also told me it wasn't much to worry about (assuming it didn't get worse) and to stay off NSAIDS and drink plenty of water.

If your pops hasn't had radiation treatments then this is probably not his issue, however I would say you should still hollar at the urologist to see what they say. Blood in the urine is kind of their thing.

I was diagnosed Stage 4 in 2018 and I am still around. Stay strong!