My cat is 14, and a little while ago I started noticing she was drinking more water than usual.
She seemed totally fine otherwise. Still eating normally, still acting like herself, nothing that felt dramatic or urgent. If I hadn't been paying attention, I probably would've brushed it off.
What made me take it seriously was that I remembered seeing a post on Reddit before about older cats drinking more and kidney disease. That stuck with me enough that I decided to make a vet appointment instead of waiting.
They ran bloodwork, and it turned out she does have early kidney disease.
I'm really glad I didn't ignore it, because if I had waited for something more obvious, I think we would've caught it a lot later. The extra drinking was the first thing that felt different, and it was subtle enough that I could've easily talked myself out of it.
It really made me realize how important those slow day-to-day changes are with senior cats. If I hadn't noticed her water intake changing, I don't know how much longer it would've taken me to realize something was off.
Has anyone else caught a health issue in a senior cat because of a really small habit change first?