Bladder inflammation: that is the same iFLUTD as with Tigris. In 53,8% of the cases they do not find the reason (stones, infection) for Feline Lower Urinary Tract Diseases. Then they call it idiopathic (that's the i in the iFLUTD). It is parallel to human Idiopathic Cystitis.

The therapy may be cortisone as well (which keeps inflammations down). With Tigris (in whose case it was the urethra that was inflammed, but he also had blood in the urine) it is helping very well. I hope it is over when tomorrow he has gotten his last pill.

Good luck for Onyx girl- this is nothing that's due to her age.