Vet said it is an "interstitial" or "idiopathic" cystitis, OFTEN seen in "middle aged cats" lol after a real infection.

The vet and I discussed stress...and though Oscar is pretty mellow, he can spook easily. The vet is with me on using Feliway instead of a tranny (which I am glad).

He said to continue with the cranberry - and that this type of cystitis may flare up once in a while.

Wonder if I should change litter in about a month to see if there is still blood in the urine?

Thank you all who responded...just a MIDLIFE kitty thing!

hugs
Catty1