Originally Posted by Keycube
Prissi has what sounds like sinus congestion on random occasions, similar to what you describe. Comes and goes in a matter of seconds. She's had it from the day I took her in, a couple of years ago. She's the happiest, healthiest kitty, so I wouldn't necessarily be concerned if that's the only symptom.
My recue tortie, Kasey, does the same thing.
At first I was concerned it was a chest wease but it is nasal, al most like a type of purring.
She doesn't do it when she is active so I doubt it is a respiratory issue. She makes the noise, at random when at rest, it stops immediately if some intersting "distraction" occurs, leading me to believe it is just anothe noise she choses to make.