[robflynn]

Yes, this is so scary! I know I'm just hopping in here with anecdotes but this happened to my friend's mother as well. She was seemingly getting dementia, her health got really bad, she was tired all the time, couldn't figure out what it was for a while. Eventually they figured out UTI, treated it, and all the mental stuff went away as well.

[sakopov]

UTI almost always causes delirium in the elderly. Those with dementia go completely off the rails. When my grandma had UTI she was basically in a parallel dimension talking to her deceased parents and that kind of thing.